What is the working principle of fiber optic grating pressure sensors-INNO

Apakah a fiber optic pressure sensor

As a type of fiber optic sensor, pressure sensor is widely used in the measurement of stress such as intelligent robot fingers, vehicle gravity, static surface water pressure, and surface tension of devices due to its simple principle, rintangan yang kuat terhadap gangguan elektromagnet, and resistance to corrosion. Pada masa ini, pressure sensors mainly use ordinary single-mode optical fibers, polarization maintaining optical fibers, microstructure optical fibers, and other optical fibers based on the principle of total internal reflection of optical fibers for guiding light. By engraving various periods of Bragg gratings inside the optical fibers to detect external loads, a lateral pressure sensor is formed. FJINNO provides fiber optic sensors, penderia parut gentian optik, and fluorescent fiber optic sensors at reasonable prices. Selamat datang untuk menghubungi kami!

FBG fiber Bragg grating is achieved by introducing periodic refractive index changes in the fiber core area through ultraviolet laser irradiation. When the refractive index variation period of the single-mode fiber core is small, it can couple the forward transmission fundamental mode with the backward transmission fundamental mode and transfer most of the power. This type of fiber grating is called fiber Bragg grating, FBG grating, and the wavelength of light that satisfies this energy conversion or resonance is called the Bragg wavelength of fiber Bragg grating, or the center wavelength of fiber Bragg grating.

Traditional gas or liquid pressure measurement devices are achieved by changing the shape of elastic elements when pressure changes, memacu penunjuk yang berkaitan untuk berputar, atau menyebabkan perubahan dalam output penderia terikan elektronik yang dipasang padanya. Dengan memutarkan penunjuk, tekanan hanya boleh dibaca secara kasar, dan nilai tekanan tidak boleh dikumpulkan dan dihantar; Isyarat sensor tekanan elektronik memerlukan pemerolehan dan penghantaran litar yang sepadan. Dalam situasi tertentu di mana bekalan kuasa tidak dapat dijamin, gangguan elektromagnet persekitaran adalah besar, terdapat banyak sensor dengan pendawaian yang kompleks, persekitaran mudah terbakar dan meletup, dan jarak penghantaran isyarat adalah panjang, penderia tekanan elektronik menghadapi kesukaran yang ketara dalam aplikasi praktikal.

Kelebihan Penderia Tekanan Grating Fiber Bragg

Penderia tekanan bendalir ialah penderia yang digunakan secara meluas, seperti jambatan, empangan, hidrologi, terowong, kejuruteraan kimia, meteorologi, cerun, dll. They are commonly used sensing elements for detection or monitoring. Due to temperature interference, gangguan elektromagnet, keselamatan, penghantaran jarak jauh, hayat perkhidmatan, kebolehpercayaan, dan sebab-sebab lain, various existing detection solutions cannot effectively solve the pressure detection problems in this series of industries. Serat optic grating pressure sensors can solve the problems caused by temperature interference, gangguan elektromagnet, keselamatan, penghantaran jarak jauh, hayat perkhidmatan, kebolehpercayaan, and other factors in current detection solutions. The pressure monitoring in existing technologies usually uses mechanical pressure sensors and electrical pressure sensors. Mechanical pressure sensors cannot achieve online monitoring, while electrical pressure sensors have the risk of short circuits due to the need for wires to transmit data. The monitoring and fiber optic signal transmission of fiber optic grating pressure sensors are non electric and have no electromagnetic interference. Compared with mechanical and electrical pressure sensors in existing technologies, they have excellent insulation performance measurement, ketepatan yang tinggi, dan rintangan yang kuat terhadap gangguan elektromagnet.

The characteristics of fiber optic sensors

Fiber optic sensors have advantages such as no need for power supply to the sensing head, no interference from environmental electromagnetic waves, multiple sensors can be multiplexed in series through a single fiber optic, the sensing head does not generate electrical sparks, and is absolutely safe for long-distance transmission. They have significant advantages in certain environmental applications.

The working principle of fiber optic grating pressure sensor

Fiber optic grating sensor is a type of fiber optic sensor, which is a wavelength modulated fiber optic sensor. Fiber Bragg grating sensors obtain sensing information through modulation of fiber Bragg wavelength by external physical parameters. Compared to electronic sensors, fiber optic grating sensors are more suitable for use in harsh environments such as oil, gas, industri petrokimia, or high temperature and pressure.

Install fiber optic gratings in mechanical structures that can generate displacement or strain under pressure. When the pressure changes, the mechanical structure changes, causing changes in the strain of the fiber optic grating, resulting in changes in the period and center wavelength of the fiber optic grating. Due to the small transmission loss of light waves in the fiber optic, sensors can be connected to wavelength change detection instruments (demodulators) through long (several kilometers or longer) optical fibers to achieve long-distance sensing and measurement.

FJINNO is committed to the research and development of fiber optic grating pressure sensors. Fiber optic grating pressure sensors are widely used in dams, cerun, terowong, pit foundations. Fiber optic grating pressure sensors can be installed once and used for a long time; Pemantauan jauh, bebas penyelenggaraan.