良いセンサーの選び方-INNO

There are many types of sensors, including commonly used thermal resistance sensors, 光ファイバーセンサー, 等. FJINNO has independently developed fiber optic temperature sensors. ようこそお問い合わせください.

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. 理論的には, 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. しかし, in reality, 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. 安定性

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. したがって, in order for sensors to have good stability, they must have strong environmental adaptability.

3. Sensitivity selection

いつもの, 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. しかし, it should be noted that the sensitivity of the sensor is high, and external noise unrelated to the measurement is also easily mixed in, which can be amplified by the amplification system and affect the measurement 正確さ. したがって, it is required that the sensor itself should have a high signal-to-noise ratio and minimize the introduction of interference signals from the outside world.

The sensitivity of sensors is directional. When the measured quantity is unidirectional and requires high directionality, sensors with low sensitivity in other directions should be selected; If the measured vector is a multidimensional vector, the smaller the cross sensitivity of the sensor, the better.

Determine the type of sensor based on the measurement object and measurement environment

To carry out a specific measurement work, the first thing to consider is what principle of sensor to use, 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, どのタイプのセンサーを選択するかを決定できます, 次に、センサーの具体的な性能指標を検討します。.

周波数応答特性

センサーの周波数応答特性により、測定する周波数範囲が決まります, 許容周波数範囲内で歪みのない測定条件を維持する必要があります。. 実際には, センサーの応答には常に一定の遅れがあります, 遅延時間が短くなることが期待されます, the better. センサーの周波数応答が高い, その結果、測定可能な信号周波数の範囲が広くなります. しかし, 構造的特性の影響により, 機械系の慣性が大きい, 低周波数のセンサーは、より低い周波数の信号を測定できます。.