1. The size of the measured oscillation;
2. The frequency scale of the oscillating signal;
3. The environment of the oscillation test site;
1) Selection and measurement scale of the sensitivity of the oscillation sensor
The oscillation estimation will help to determine the sensitivity, scale and resolution of the sensor. The measurement scale refers to the maximum amount that the sensor can measure. The maximum measurement value is generally related to the promised non-linear error, and the measurement scale of the voltage output accelerometer is equal to the ratio of the maximum signal voltage of the sensor output to the sensitivity.
The minimum measurement value generally depends on the electrical noise of the measurement system. The primary source of electrical noise for low-impedance voltage output accelerometers is the electrical noise of the sensor's built-in circuitry, so the minimum measurement value is the ratio of the sensor's electrical noise to sensitivity. It is necessary to point out that the electrical noise of a general sensor refers to its effective voltage value in a wide frequency band, while the electrical noise at each frequency point is of more practical significance in the frequency domain analysis of the oscillating signal. In particular, for the measurement and analysis of low-frequency signals, it is particularly important to understand the electrical noise at the measured frequency because the acceleration signal is relatively weak and the electrical noise increases.
After considering the maximum and minimum measurement values, the selection of sensitivity should be as high as possible under the conditions of small size and frequency scale.
2) The selection of oscillation sensor measurement frequency scale
The frequency scale measured by the sensor refers to the frequency scale with a certain sensitivity error based on the sensitivity of the specified frequency point. The sensitivity error is generally \, which can be divided into ±5% ± 10% ±3dB. As a general rule, the sensor with high sensitivity has a low cut-off frequency at high frequency and a heavier sensor weight, while a sensor with a wide measurement frequency scale is small in size and light in weight, but the sensitivity is low.
It is necessary to point out that the measurement scale of the sensor is closely related to the device method. The frequency scale of the sensor should be used in conjunction with the appropriate device method. Excessive frequency scale of seeking sensors is not only difficult to achieve in the process of practical application, but also greatly increases the cost of sensors.
3) Consideration of measuring environmental impact
The first is to consider the sensor size, weight and signal output mode. Secondly, according to the practice of the test site, the technical indicators related to the influencing factors are considered
*Temperature response*Influence of base strain*Effect of transverse oscillation*Effect of Sina ground loop
*Magnetic sensitivity*Acoustic sensitivity*Limitations of device method*Cable for signal transmission in connector mode
4) Comparison of low impedance voltage output and charge output sensor
The advantages of low-impedance voltage output sensors with built-in circuitry over traditional charge output sensors are primarily as follows:
--Easy to use, no need to set the secondary appearance, and the data acquisition system with constant current power supply can be directly connected to the sensor
The signal quality of the --- test is good, especially in low-frequency measurement, long-distance measurement and online fault detection of industrial equipment.
--- the limitations of the built-in circuit to the environment (typically 125 degrees), the charge type sensor can withstand an operating ambient temperature of 250 degrees.
Other common considerations in sensor selection are sensor stability, reliability, and dispersion of performance indicators. However, there is little specific data to evaluate these characteristics in the practical sensor specifications, because other customers' experience in the use of similar sensors and similar measurement environments is often used as a reference.
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