optical grating transducer working principle！

Grating sensors (optical grating transducer) refers to the use of the moire grating displacement sensor measuring principle. Raster on a long strip is optically dense glass spaced parallel score lines, the groove density of 10 to 100 lines / mm. Formed by the moire grating having an optical amplification effect and the average error, which can improve the measurement accuracy. Sensor consists of grating ruler, index grating, composed of four parts optical system and measuring system (see figure). Scale grating is moved relative to the index grating, it is formed by a substantially sinusoidal distribution of light and dark moire. These stripes to the relative velocity of the moving grating, and direct exposure to the photovoltaic element in their outputs to obtain a series of electrical impulses through the amplification, shaping, and to distinguish counting system generates a digital signal output directly display the measured displacement the amount. Optical sensors, there are two forms: one is a transmission grating, its gate line engraved in the transparent material (such as industrial white glass, optical glass, etc.); the other is a reflective grating, its carved gate line metal (stainless steel) or glass with a highly reflective gold plated metal film (aluminum) on. The advantage of this sensor is a large measuring range and high accuracy. Grating sensor in programmed, CNC machine tools and coordinate measuring mechanism, measurable static and dynamic linear displacement and displacement whole fillet. In the field of mechanical vibration measurement, deformation measurement are also applied.

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