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Soft subdivision method of moire frange signal of grating

A moiré fringe and grating technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of residual DC level and DC level, signal high-order harmonics, and poor phase orthogonality of two-way signals. Achieve the effect of improving accuracy and resolution and simple hardware

Inactive Publication Date: 2011-10-05
CHONGQING UNIV OF TECH
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Problems solved by technology

Due to the influence of the manufacturing process of the grating sensor, the lighting source, the grating gap, the grating diffraction, the characteristics of the photoelectric element, the power supply and the ambient temperature, the output signal of the photoelectric element contains high-order harmonics, residual DC level and DC level drift. , Inconsistent amplitude of two signals, poor phase orthogonality of two signals, etc. These factors directly affect the accuracy and reliability of various existing subdivision methods

Method used

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  • Soft subdivision method of moire frange signal of grating
  • Soft subdivision method of moire frange signal of grating
  • Soft subdivision method of moire frange signal of grating

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Embodiment Construction

[0026] Below in conjunction with concrete hardware and software illustrate the realization of the inventive method:

[0027] see image 3 , using a high-speed ARM processor LPC1769 (U1) to complete various data processing and implement subdivision algorithms. The two sine and cosine signals of A and B are respectively connected to the FA and FB terminals of the zero-crossing detector composed of the voltage comparator chip LM211D (U2). The signal terminal D is connected to the P1.16 pin of the ARM processor LPC1769 (U1). The square wave signal of channel A is connected to the CAP0.0 pin and EINT1 pin of LPC1769 (U1) at the same time, and is connected to the signal latch terminal Lock of the CPLD chip (U3). The two subdivided pulse signals are respectively output from the PWM1 and PWM2 terminals, and the PWM1 and PWM2 are respectively connected to the IA and IB terminals of the internal counting and latch circuit of the CPLD chip (U3). The signal enable terminal En of the co...

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Abstract

The invention provides a soft subdivision method of a moire frange signal of grating by adopting a micro-processing technology, which generally comprises the following steps of: transforming the information of space domain into time domain to process by using the space-time transformation technology; processing the data via software by using the theoretical modeling technology of time sequence tofinish the accurate prediction of time capacity; then returning to the space domain by using the high-speed microprocessor technology and outputting the time pulse with spatial meaning to finish real-time subdivision of the moire frange signal of grating; and finally performing real-time correction on the subdivision error. The invention is applicable to high expansion subdivision of the moire frange signal of grating and improves the precision and resolution of the grating measurement system.

Description

technical field [0001] The invention relates to a new signal processing method of a precision displacement measuring sensor (including angular displacement and linear displacement). Background technique [0002] At present, grating technology is used in more than 90% of the field of precision displacement measurement. The measurement standard adopts periodic grating lines divided by space, and the displacement is obtained by counting the lines. Precision measurement requires the ability to measure straight lines of 1 μm to 0.1 μm and angles of 1″ to 0.1″. Such accuracy and resolution are difficult to achieve only by the precise engraving of the grating sensor itself. Therefore, it is necessary to subdivide the original Moiré fringe signal of the sensor, and use subdivision methods to improve the accuracy and resolution of the measurement system. [0003] The existing subdivision methods mainly include four categories: optical subdivision method, mechanical subdivision metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
Inventor 刘小康彭东林杨继森郑方燕
Owner CHONGQING UNIV OF TECH
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