Cara Memilih Penderia Suhu Gentian Optik yang Tepat

The selection of a suitable fiber optic temperature sensor should be based on the specific requirements of the application scenario, taking into account factors such as electromagnetic environment, measurement space limitations, persekitaran yang berbahaya, measurement points and layout, measurement temperature range, accuracy and resolution requirements, as well as the working type of the probe, to ensure that the sensor can meet the temperature monitoring needs of specific environments.

1. Jenis-jenis Penderia Suhu Gentian Optik

1.1 Penderia Suhu Grating Fiber Bragg

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Fiber Bragg Grating Temperature Sensor uses the photosensitivity of fiber optic materials to form a spatial phase grating in the fiber core for temperature measurement. Contohnya, Bragg fiber grating is a new type of fiber Bragg grating formed by irradiating single-mode germanium doped fiber with ultraviolet light to form a grating technology. After grating, the refractive index of the fiber core shows periodic distribution stripes and produces Bragg grating effect. Its basic optical characteristic is a narrowband optical filter centered on the resonance wavelength, which satisfies
Optical equations. Long period fiber Bragg grating couples the fundamental mode of forward transmission into the cladding mode of forward transmission.
characteristic
Saiz kecil: Compared with general light temperature sensors, fiber Bragg grating sensors have a smaller size, which makes them advantageous in some space limited application scenarios. Contohnya, in the aerospace field, where space is limited on aircraft, small-sized sensors are easier to install and use.
The detection quantity is wavelength information: it is not affected by factors such as light source fluctuations, kehilangan lenturan gentian, connection losses, dan pengesan penuaan. Contohnya, in long-distance fiber optic transmission, even if there is a certain degree of bending or connection points in the fiber optic, it will not have a significant impact on the measurement results.
Not sensitive to environmental interference: Lebih-lebih lagi, wavelength encoding allows for easy use of wavelength division multiplexing technology, enabling accurate temperature measurement in complex environments. Dalam sistem kuasa, there are complex environmental factors such as electromagnetic interference in places like substations, and fiber Bragg grating temperature sensors can work stably.
Fast measurement speed: The measurement speed of a single optical fiber is generally within tens of milliseconds, and the transmission distance of the fiber can reach more than 10km, which can meet some temperature monitoring requirements with high real-time requirements, such as temperature monitoring of large motors, transformers and other equipment.

1.2 Distributed Fiber Optic Temperature Sensor

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Mainly based on Raman scattering effect and Optical Time Domain Reflectometer (OTDR) technology to achieve continuous distributed measurement. The reflected light of laser in fiber optic transmission mainly includes Rayleigh scattering, Raman berselerak, dan penyerakan Brillouin. Gentian optik teragih sensors have gone through the development process from the initial liquid core fiber distributed temperature monitoring system based on backward Rayleigh scattering, to fiber optic temperature measurement system based on optical time-domain Raman scattering, and fiber optic temperature measurement system based on optical frequency-domain Raman scattering.
characteristic
Distributed measurement capability: It can continuously and real-time measure the temperature at various points along the fiber optic cable within a few kilometers, with a positioning accuracy of up to meters and a measurement accuracy of up to 1 ijazah. It is very suitable for applications such as temperature measurement at large-scale intersection points. Contohnya, in oil fields, it can monitor the temperature distribution along oil pipelines and timely detect potential leakage points.
There are many research hotspots: Brillouin scattering time-domain and frequency-domain systems are also hot topics in the field of fiber optic sensors. Several companies have corresponding products, which means that their technology is constantly developing and improving, and the future application prospects are broad.

1.3 Penderia Suhu Gentian Optik Pendarfluor

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It is a sensor that uses fluorescent materials to undergo changes in fluorescence intensity or wavelength under temperature changes, and transmits signals through optical fibers to achieve temperature detection. A typical fluorescent fiber optic temperature sensor includes a light source, gentian optik, bahan pendarfluor, and a spectral analyzer. The light source generates excitation light of a certain wavelength, which is transmitted to the fluorescent material through an optical fiber. After the fluorescent material absorbs the excitation light, it emits a fluorescence signal with a specific wavelength, which is transmitted back to the spectrometer for detection through the optical fiber. Apabila suhu berubah, the fluorescence characteristics of the fluorescent material will change, which may be a change in fluorescence intensity or a shift in fluorescence wavelength. Nilai suhu boleh ditentukan dengan mengukur keamatan atau panjang gelombang isyarat pendarfluor.

characteristic
Ketepatan tinggi: Fluorescent materials are particularly sensitive to temperature changes, making fluorescent fiber temperature sensors have high measurement accuracy and can be used in medical diagnostic fields that require high temperature measurement accuracy, such as temperature monitoring in some high-precision biomedical research.
Respon cepat: capable of real-time monitoring of temperature changes and immediate response, suitable for scenarios that require high response speed to temperature changes, such as temperature monitoring in some chemical reaction processes.

Multi point temperature detection capability: It can monitor the temperature of multiple locations simultaneously through a fiber optic temperature transmitter, which is very useful in situations where multiple points need to be monitored. Contohnya, in the temperature monitoring of server rooms in large data centers, suhu berbilang pelayan boleh dipantau serentak.
Keupayaan anti-gangguan yang kuat: tidak terjejas oleh isyarat gangguan, mampu bekerja secara normal dalam persekitaran elektromagnet yang kompleks. Dalam persekitaran industri, seperti tempat yang mempunyai sejumlah besar peralatan elektrik yang menghasilkan gangguan elektromagnet, suhu masih boleh diukur dengan tepat.
Kestabilan jangka panjang: Bahan pendarfluor mempunyai ketahanan dan kestabilan yang kuat, dan sensor boleh mengekalkan kestabilan prestasi tinggi semasa penggunaan jangka panjang, menjadikannya sesuai untuk pemantauan dan kawalan suhu masa nyata dalam pengurusan tenaga dan bidang lain.
Julat suhu persekitaran yang luas: Sesuai untuk pelbagai suhu persekitaran, dari rendah ke tolak Baidu ke tinggi hingga beberapa ratus darjah, ia boleh digunakan untuk pengukuran suhu dalam pelbagai persekitaran suhu yang melampau, seperti persekitaran kutub atau pemantauan suhu berhampiran relau industri suhu tinggi.

1.4. Sensor suhu gentian optik jenis gangguan

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Contohnya, the fiber Fabry Perot interferometric temperature sensor is based on the temperature sensitive characteristics of the interference fringes of the Fabry Perot interferometer. Apabila suhu berubah, the position of the interference fringes will move, allowing for accurate temperature measurement. Such sensors typically require fine optical structures to ensure high-precision temperature readings.
characteristic
Pengukuran ketepatan tinggi: Due to its reliance on the movement of interference fringes to measure temperature, as long as the optical structure design is reasonable and the accuracy is high enough, it can achieve very accurate temperature measurement, which can be used in fields such as scientific research that require extremely high precision.
High requirements for optical structure: Fine optical structure is needed, which means that its manufacturing and installation costs may be relatively high, and there are also certain requirements for the usage environment, such as avoiding the influence of interference factors such as vibration on the optical structure.

1.5. Semiconductor absorption type fiber optic temperature sensor

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This type of sensor utilizes the property of the absorption spectrum of semiconductor materials changing with temperature, and calculates temperature by monitoring changes in light intensity. The selection and processing technology of semiconductor materials have a significant impact on their performance.
characteristic
Related to the characteristics of semiconductor materials: their performance depends on the selected semiconductor material and its processing technology, and different semiconductor materials may be suitable for different temperature ranges and measurement accuracy requirements.
Light intensity monitoring and measurement: By monitoring changes in light intensity to calculate temperature, this measurement method is relatively direct, but may be affected by factors such as light source stability. If the light intensity of the light source is unstable, it may cause certain errors in the measurement results.

2. Key factors for selecting fiber optic temperature sensors

2.1 Application scenario requirements

electromagnetic environment
If there is strong electromagnetic interference in the application scenario, such as near substations, alat suis voltan tinggi, or around some large industrial motors in the power system, traditional temperature measurement methods may be severely affected and unable to work properly. Fiber optic temperature sensors have the characteristics of light waves not producing electromagnetic interference and not afraid of electromagnetic interference. Fiber optic grating temperature sensors, penderia suhu gentian optik pendarfluor, dll. can accurately measure temperature in complex electromagnetic environments.
Measurement space limitations
When the measurement space is small, such as temperature measurement inside aerospace equipment or some precision instruments, a fiber optic temperature sensor with small size, ringan, no charge on the fiber itself, saiz kecil, ringan, and easy bending is very suitable. The small size of fiber optic grating temperature sensors meets this requirement.

Dangerous environment
In flammable, bahan letupan, and corrosive environments, such as refineries in the petrochemical industry and warehouses storing flammable and explosive chemicals, there are special requirements for safety and corrosion resistance. Fiber optic temperature sensors have good radiation resistance and are particularly suitable for use in harsh environments such as flammable, bahan letupan, space limited, dan gangguan elektromagnet yang kuat. Contohnya, fiber optic sensors with special coatings or materials (such as polyimide coated fibers that can be used in certain high-temperature and corrosion-resistant environments) can be used in such hazardous environments
.

2.2 Measurement Points and Layout

Single point and distributed
Based on the number of measurement points required, determine whether to use “diedarkan” atau “titik tunggal” penderia, which involves issues of single point cost, total cost, and installation layout. Biasanya, when there are less than 50 titik pengukuran, a “single point type” such as a fluorescent sensor is used; Apabila terdapat lebih daripada 50 titik pengukuran, “diedarkan” sensors such as fiber Bragg grating sensors are usually used. If measuring the temperature along a long oil pipeline, multiple measurement points are required, and distributed fiber optic temperature sensors are more suitable; If only measuring the temperature of a key part inside a small device, penderia titik tunggal boleh memenuhi keperluan.

2.3 Julat pengukuran suhu

Applicability of different temperature ranges
The temperature measurement range of the sensor is an important factor.
Biasanya, the temperature measurement range of sensors is divided into multiple segments, seperti -40 ℃ -+80 ℃,
-40 ℃ -+80 ℃ is the measurement range for ordinary environments, and various sensors can be used;
−40℃−+250℃
-40 ℃ -+250 ℃ can be used for measuring high-temperature industrial environments such as electrical systems, and most sensors are also applicable;
−40℃−+400℃
-40 ℃ -+400 ℃ belongs to high-temperature environments, and sensors in such environments must be specially treated. Ordinary fiber optic sensors generally do not meet these testing requirements, and transmission fibers must use high-temperature resistant materials such as polyimide. Contohnya, in ordinary indoor environment temperature monitoring, multiple types of fiber optic temperature sensors can be selected, while measuring temperature near high-temperature industrial furnaces requires the selection of special fiber optic temperature sensors that can withstand high temperatures.

2.4 Accuracy and Resolution Requirements

Selection of sensors with different precision levels
Biasanya, temperature measurement accuracy is divided into five levels:
± 0.05 ℃, ± 0.1 ℃, ± 0.3 ℃, ± 0.5 ℃, ± 1 ℃. High precision sensors generally include fiber Fabry Perot interference type, fluorescence type, semiconductor absorption type, and sensitized fiber Bragg grating temperature sensors. If it is a scenario in biomedical research that requires extremely high temperature accuracy, such as temperature monitoring during certain cell culture processes, adalah perlu untuk pilih penderia suhu gentian optik with high accuracy levels; In some industrial production process monitoring that does not require particularly high temperature accuracy, sensors with relatively low accuracy can be selected to reduce costs.

2.5 Working types of probes

Immersion type, contact type, medical type, dll
Penderia rendaman boleh digunakan untuk mengukur suhu pepejal, cecair, dan gas. Immersion sensors are specially treated, and the optical fibers have strong strength and toughness, yang boleh menahan kakisan kimia dalam tangki cecair. Contohnya, in chemical production, immersion sensors can be used to measure the temperature of the liquid inside the reaction kettle. Penderia kenalan khusus dalam mengukur suhu permukaan objek, seperti pemantauan suhu peralatan voltan tinggi seperti transformer jenis kering, alat suis voltan tinggi, dan busbar voltan tinggi. Medical sensors are specially designed for life science measurement, with small and thin probes that, when combined with dedicated demodulation devices, boleh mencapai kelajuan tindak balas yang pantas dan ketepatan yang sangat tinggi. They can be used in medical scenarios such as temperature monitoring of internal tissues in the human body.

3. Selection method of fiber optic temperature sensors in different application scenarios

3.1 Sektor perindustrian

Sistem kuasa
In power plants, substations and other places, there are a large number of electrical equipment with strong electromagnetic interference, and temperature monitoring of key parts of the equipment (seperti transformer, alat suis, dll.) is required. For this scenario, fiber Bragg grating temperature sensors are a more suitable choice. Because of its small size and insensitivity to environmental interference, it can accurately measure the surface temperature of equipment, and multiple sensors can be connected to a single optical fiber to monitor multiple key areas. If monitoring the temperature distribution along the cable, distributed fiber optic temperature sensors are more suitable. They can achieve continuous distributed measurement, timely detect cable hotspots, and prevent cable failures.
Industri petrokimia
There are hazardous environments such as flammable, bahan letupan, and corrosive gases in refineries, oil storage facilities, and other places. Temperature monitoring of equipment such as pipelines and reaction vessels is required here. Fluorescent fiber optic temperature sensors are a good choice, as they have strong anti-interference ability and can work in harsh environments. They can also measure temperature with high accuracy, detect temperature anomalies in equipment in a timely manner, and prevent safety accidents. If monitoring the temperature distribution of long-distance oil pipelines, distributed fiber optic temperature sensors can leverage their advantages in distributed measurement to accurately grasp the temperature conditions along the pipeline.

3.2 Aerospace field

Inside the aircraft
Due to the limited internal space of the aircraft, there are strict requirements for the size and weight of sensors, and sensors need to be able to adapt to various complex environments during the operation of the aircraft. Fiber Bragg grating temperature sensors or small fluorescent fiber optic temperature sensors are more suitable. They are small in size, light in weight, and have strong resistance to electromagnetic interference. Mereka boleh mengukur suhu dengan tepat dalam persekitaran elektromagnet dan ruang terhad pesawat, seperti memantau suhu dalaman enjin pesawat atau suhu kabin peralatan elektronik pesawat.

3.3. Bidang perubatan

Pengukuran dalaman badan manusia
Apabila mengukur suhu tisu dalaman dalam tubuh manusia, seperti pemantauan suhu dalam beberapa pembedahan invasif minimum atau penyelidikan mengenai suhu organ, penderia suhu gentian optik perubatan adalah pilihan terbaik. Kerana probenya kecil dan nipis, ia boleh merosakkan tisu manusia secara minimum, dan apabila digabungkan dengan penyahmodulasi khusus, ia boleh mencapai kelajuan tindak balas yang pantas dan ketepatan yang sangat tinggi, mendapatkan maklumat suhu di dalam badan manusia dengan tepat.
Pemantauan suhu peralatan perubatan
For temperature monitoring of some medical equipment in hospitals, such as large X-ray machines, peralatan MRI, dll., due to the possible electromagnetic interference around these devices, temperature monitoring of key parts of the equipment is required. Fiber Bragg grating temperature sensors or fluorescent fiber optic temperature sensors can meet the requirements. They have strong electromagnetic interference resistance and can accurately measure the surface temperature of equipment, ensuring the normal operation of medical equipment.

3.4. Construction field

Building structure monitoring
When monitoring the structural safety of buildings, such as monitoring temperature changes inside concrete structures such as bridges and dams, fiber optic grating temperature sensors are easily embedded in materials to measure the internal temperature with high resolution and wide range. It can be combined with building materials to monitor long-term and stable temperature changes inside the structure, providing data support for evaluating the structural performance of buildings.
Building fire warning
Diedarkan penderia suhu gentian optik can play an important role in fire warning systems for buildings. It can be deployed along the corridors, rooms, and other areas of the building to achieve real-time monitoring of the temperature distribution throughout the entire building. Once an abnormal increase in local temperature is detected, a fire warning signal can be issued in a timely manner.

4. Comparison and Evaluation of Fiber Optic Temperature Sensor Brands

4.1 Fuzhou Yingnuo Technology

Product features and advantages
The manufacturer’s fiber optic temperature sensor adopts advanced fluorescent fiber optic temperature measurement technology, which has the characteristics of wide temperature measurement range, ketepatan yang tinggi, dan keupayaan anti-gangguan yang kuat. Contohnya, its products can accurately measure temperature in complex industrial environments or strong electromagnetic interference environments, and can cover a wide temperature measurement range to meet the needs of different scenarios.
Service advantages
Provide personalized customization services, tailored according to the needs of customers, to meet the application requirements of different fields. This can well meet the sensor requirements for some special application scenarios, such as specific shapes or special functional requirements. In the petrochemical industry, customized services have great advantages in measuring the temperature of reaction vessels with special shapes.

4.2. Huaguang Tianrui

In terms of product performance
Huaguang Tianrui’s fiber optic temperature sensor is renowned for its high precision, kestabilan, dan sensitiviti. The accuracy of its products can meet the needs of some industries that require high temperature measurement accuracy, such as high-precision temperature measurement in the medical field or precise temperature control experiments in scientific research. High stability enables sensors to maintain stable measurement performance over long periods of use, reducing the occurrence of measurement errors.
Product diversity and applicability
Its fiber optic temperature sensor has multiple models and specifications to choose from, suitable for various application scenarios such as industrial power, metalurgi, perubatan, dll. In the field of industrial power, suitable types of sensors can be selected according to different equipment and measurement requirements; Dalam bidang perubatan, there are also small, high-precision sensors suitable for measuring human body temperature to choose from.
after-sale service
Provide comprehensive after-sales service to ensure smooth and satisfactory user experience during use. This enables timely resolution of issues encountered by users during use, ensuring the normal use of sensors and improving the user experience.

4.3 Comparison with other brands

Compared to traditional temperature sensor brands
Compared with traditional temperature sensor brands such as thermocouples and thermistors, fiber optic temperature sensor brands have unique advantages. Traditional temperature sensors have shortcomings in terms of electromagnetic interference resistance and adaptability to harsh environments, while products from fiber optic temperature sensor brands perform well in these areas. Contohnya, in industrial environments with strong electromagnetic interference, traditional thermocouples may be affected by interference and affect measurement accuracy, while fiber optic temperature sensors can work normally.
Collaborate with internationally renowned temperature sensor brands (non fiber optic)
Some well-known non fiber optic temperature sensor brands internationally have certain advantages in their traditional measurement fields, but fiber optic temperature sensor brands have irreplaceable advantages in some special fields such as flammable and explosive environment measurement, long-distance distributed temperature measurement, dll. Contohnya, in long-distance temperature distribution monitoring of oil pipelines, fiber optic temperature sensors can utilize their distributed measurement characteristics, while traditional point temperature sensors cannot achieve this function.

5. Latest selection guide for fiber optic temperature sensors

5.1 Clarify application requirements

Determine the measurement environment
Pertama sekali, it is necessary to clarify the characteristics of the measurement environment, such as whether there is strong electromagnetic interference, whether it is a hazardous environment (mudah terbakar, bahan letupan, corrosive, dll.), and whether the measurement space is narrow. If it is in a strong electromagnetic interference environment, such as inside a substation, it is necessary to prioritize fiber optic temperature sensors with strong anti electromagnetic interference capabilities, such as fiber optic grating temperature sensors or fluorescent fiber optic temperature sensors; If measuring in a narrow space, such as temperature measurement inside aerospace equipment, it is necessary to choose small-sized sensors, such as fiber Bragg grating temperature sensors.

5.2 Clearly define the number of measurement points and layout

Determine whether single point measurement or distributed measurement is required. If the number of measurement points is small (kurang daripada 50), such as measuring the temperature of a small motor, a single point sensor (such as a fluorescent fiber optic temperature sensor) may be sufficient; If measuring the temperature along a long power cable with a large number of points, a distributed fiber optic temperature sensor needs to be selected.

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