How to measure the strain of the FBG sensor

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It is not enough to have a sensor, but also a demodulator, a fusion splicer, and so on. The Bragg grating is to measure the strain by using the wavelength change of the grating sensor on which the deformation caused by the deformation of the object is pasted (welded), and there are ready-made fiber grating strain variants. If you are just a bare grating, just stick the grating 502 on the surface of the object to be measured, and use it as a temperature response sensor to stick it on the same material that is not stressed to compensate for the change caused by temperature changes.

Some off-the-shelf sensors are self-compensating and do not require temperature compensation.

This ** explains the sensing principle of FBG sensors, first briefly describes what FBG is, what is FBG, and common FBG manufacturing methods, and then focuses on the fundamental reasons why FBG can be used for temperature, force and length testing.

Summary. A grating is a dense and equally spaced parallel engraving on a long strip of optical glass, with a density of 10 100 lines. The stacked grid fringes formed by the grating have an optical amplification effect and an error averaging effect, which can improve the measurement accuracy.

The sensor consists of four parts: ruler grating, indication grating, optical path system and measurement system.

A grating is a dense and evenly spaced parallel line on a long strip of optical glass, with a density of 10 100 lines. The fringe resistance of the stacked grid scrambling wheel formed by the grating has the optical amplification effect and the error averaging effect, so that the measurement accuracy can be improved. The sensor consists of four parts: ruler grating, indication grating, optical path system and measurement system.

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A grating is a dense and evenly spaced parallel line on a long strip of optical glass, with a density of 10 100 lines. The fringe resistance of the stacked grid scrambling wheel formed by the grating has the optical amplification effect and the error averaging effect, so that the measurement accuracy can be improved. The sensor consists of four parts: ruler grating, indication grating, optical path system and measurement system.

Grating block for sale, rolling shape, light glass, dense equal spacing, parallel engraving, engraving density, 10 100 lines, mm, by grating-shaped stacked grid stripes, with photo-amplification error, average effect can improve the accuracy of measurement, the transmitter is composed of four parts: ruler grating, indication grating, optical path system, and measurement system.

A grating sensor is a commonly used non-contact measuring device that can be used to detect the position, velocity, acceleration and other parameters of an object. Its working principle is to convert the signal generated when the object is moving into an electrical signal through the photoelectric effect, and output it after being processed and amplified by a specific circuit.

In the measuring circuit of a grating sensor, there are two main functions:

1.Signal amplification: Due to the small signal generated by the grating sensor, it needs to be amplified appropriately to achieve an effective detection range. For this reason, a preamplifier or operational amplifier is usually set up in the measurement circuit to gain the input signal.

2.Signal filtering: In practical application scenarios, there may be various interference factors (such as noise, spurs, etc.), which will affect the accuracy and stability of the sensor output data.

In order to eliminate these interferences and improve the immunity of the system, a filter module is usually set up in the measurement circuit to denoise or bandpass filter the input signal.

To sum up, the grating sensor measurement circuit can not only convert the weak optical changes caused by the movement of the object base into an electrical signal of appropriate size and shape, but also further optimize and adjust the state through pre-amplification and filtering to achieve better detection results.