Fiber optic sensor selection points – ifm

Create Date: 2024-8-30 12:03:23|Source: IFM/ifm

1. Determine the type according to the measurement object and environment

It is necessary to carefully analyze the measurement operation and consider which principle of sensor to use for measurement, because even if the same physical quantity is measured, it can be achieved by different principles. Secondly, it is necessary to consider the range, volume (whether the space is satisfied), installation method, signal type (analog or digital signal), measurement method (direct measurement or indirect measurement), and so on.

2. Accuracy of optical fiber sensor

The accuracy level of the sensor is related to the accuracy of the whole system and is a very important parameter. Generally, the higher the accuracy, the more expensive the price. Therefore, when we choose, we have to consider the whole, what suits us is the best, do not blindly pursue the so-called high precision, unless we need to quantitatively measure the accurate value, we choose a sensor with a higher accuracy level.

Fiber optic sensor selection points – ifm

Fiber optic sensor selection points – ifm

3. Selection of sensitivity

Sensitivity is the ratio of the increment of the output to the corresponding increment of the input. We have to correctly understand this parameter, which is divided into two aspects: 1. Within the linear scale, the sensitivity is high and the output signal value is relatively large, which is an advantage. 2. The sensitivity is high, and the external noise that is not related to the measurement is also easy to mix, which affects the accuracy in the processing process.

4. Linear scale

The linear scale refers to the scale that the output is proportional to the input, so we all expect the wider the linear scale, the better, and the wider the linear scale, the larger the range and the higher the accuracy. But the linear scale of any sensor is relative. We only need to estimate the measurement quantity so that it can be within the linear scale.

5. Frequency response characteristics

In the measurement process, there is always a certain delay in the output of the sensor, which is also different from the actual value. So we expect the frequency response to be a little faster, so that the latency is a little shorter. However, due to the influence of structural and other characteristics, it is difficult to improve the frequency.

6. Stability

Stability refers to the ability to maintain its performance over a long period of time. In addition to the factors that affect stability, they are mainly environmental factors. Therefore, the selected sensor must have a strong ability to adapt to the environment, and protective measures must be adopted when appropriate.

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