Cable tension testing machine displacement sensor principle

Displacement sensors, also known as linear sensors, are divided into inductive displacement sensors, capacitive displacement sensors, photoelectric displacement sensors, ultrasonic displacement sensors, Hall-type displacement sensors.
An inductive displacement sensor is a kind of linear device that belongs to metal induction. After the power is turned on, an alternating magnetic field is generated on the sensing surface of the switch. When the metal object approaches the sensing surface, eddy current is generated in the metal and the oscillator is drawn. The energy, so that the oscillator output amplitude linear attenuation, and then according to the attenuation changes to complete the purpose of non-contact detection of objects.
Inductive displacement sensors have no sliding contact, are not affected by dust and other non-metal factors during operation, and have low power consumption, long life, and can be used in various harsh conditions. Displacement sensors are mainly used in the intelligent control of analog quantities in automated equipment production lines.
Displacement is the amount related to the movement of an object's position during movement. The range of measurement involved in the displacement is quite extensive. Small displacements are usually measured by strain gauge, inductive, differential transformer, eddy current, Hall sensors, and large displacements are often measured by sensing techniques such as inductive synchronizers, gratings, capacitive grids, and magnetic grids. Among them, the grating sensor has the advantages of easy digitization, high precision (currently the highest resolution can reach nanometer level), strong anti-interference ability, no human reading error, easy installation, and reliable use, etc., in the machine tool processing, instrumentation and other industries Get more and more widely used.
Principle :
Metering gratings use the moiré fringe phenomenon of the grating to measure the displacement. "Mohr" originally from the French Moire, which means water ripples. A few hundred years ago, French silk workers discovered that when two layers of thin silk were piled together, they would produce water-like ripple patterns; if the thin silk fabrics were moving relatively, the pattern would also follow the movement. This strange pattern is moire. In general, as long as the curve clusters having a certain period overlap, moiré fringes are generated. Metering gratings have two kinds of transmission gratings and reflection gratings in practical applications; they can be divided into radiation gratings and phase gratings according to their principle; they can be divided into linear gratings and circular gratings according to their use. The following is a discussion of transmission gratings as an example. Transmissive scales are evenly engraved with parallel lines, ie gate lines, a is the width of the engraved line, b is the width of the gap between two lines, and W=a+b is called the grating pitch. At present, domestic commonly used gratings are carved into 10, 25, 50, 100, 250 lines per millimeter. Transverse Moire fringes of gratings require two gratings. A grating is called the main grating, its size is consistent with the measuring range; the other is a very small piece, called the indicator grating. In order to measure the displacement, a light source must be added on the main grating side and a photoelectric receiving element on the side of the indication grating. When the main grating and the indicator grating move relative to each other, the moiré fringe moves due to the shading effect of the grating, and the photoelectric element fixed on the indicating grating side converts the light intensity change into an electrical signal. Due to the limited size of the light source and the diffraction effect of the grating, the signal is a ripple signal.

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