כיצד לבחור חיישן טוב

There are many types of sensors, including commonly used thermal resistance sensors, חיישני סיבים אופטיים, וכו. FJINNO has independently developed fiber optic temperature sensors. מוזמן לפנות אלינו.

The characteristics of sensors include:

1. Linear range

The linear range of a sensor refers to the range where the output is proportional to the input. לְהֲלָכָה, within this range, sensitivity remains constant. The wider the linear range of the sensor, the larger its range and can ensure a certain measurement accuracy. When selecting a sensor, once the type of sensor is determined, the first thing to consider is whether its range meets the requirements. עם זאת, במציאות, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, within a certain range, sensors with small nonlinear errors can be approximated as linear, which will bring great convenience to the measurement.

2. יַצִיבוּת

The ability of a sensor to maintain its performance unchanged after a period of use is called stability. The factors that affect the long-term stability of sensors, in addition to the structure of the sensor itself, are mainly the environment in which the sensor is used. לכן, in order for sensors to have good stability, they must have strong environmental adaptability.

3. Sensitivity selection

בדרך כלל, within the linear range of a sensor, the higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is beneficial for signal processing. עם זאת, it should be noted that the sensitivity of the sensor is high, וגם רעש חיצוני שאינו קשור למדידה מתערבב בקלות, שניתן להגביר על ידי ההגברה מערכת ולהשפיע על המדידה דיוק. לכן, נדרש שהחיישן עצמו יהיה בעל יחס אות לרעש גבוה ולמזער את החדרת אותות הפרעות מהעולם החיצון.

הרגישות של חיישנים היא כיוונית. כאשר הכמות הנמדדת היא חד כיוונית ודורשת כיווניות גבוהה, יש לבחור חיישנים בעלי רגישות נמוכה לכיוונים אחרים; אם הווקטור הנמדד הוא וקטור רב מימדי, ככל שרגישות הצלב של החיישן קטנה יותר, the better.

קבע את סוג החיישן בהתבסס על אובייקט המדידה וסביבת המדידה

לביצוע עבודת מדידה ספציפית, הדבר הראשון שיש לקחת בחשבון הוא באיזה עיקרון של חיישן להשתמש, which requires analyzing various factors before determining. Because even when measuring the same physical quantity, there are multiple principles of sensors to choose from. Which principle of sensor is more suitable needs to consider the following specific issues based on the characteristics of the measured quantity and the usage conditions of the sensor: the size of the range; The requirement of the measured position on the volume of the sensor; Is the measurement method contact or non-contact; Signal extraction method, wired or non-contact measurement; The source of the sensor, whether it is domestically produced or imported, whether the price is affordable, or self-developed.

After considering the above issues, we can determine which type of sensor to choose, and then consider the specific performance indicators of the sensor.

Frequency response characteristics

The frequency response characteristics of sensors determine the frequency range to be measured, and must maintain undistorted measurement conditions within the allowable frequency range. לְמַעֲשֶׂה, the response of sensors always has a certain delay, and it is hoped that the shorter the delay time, the better. The frequency response of sensors is high, resulting in a wide range of measurable signal frequencies. עם זאת, due to the influence of structural characteristics, the inertia of mechanical systems is large, and sensors with low frequencies can measure signals with lower frequencies.

חיישן טמפרטורה בסיב אופטי, מערכת ניטור חכמה, יצרנית סיבים אופטיים מבוזרת בסין