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FPGA (Field Programmable Gate Array)-based computer control active lap dynamic surface shape acquisition system and method

A collection system and dynamic surface technology, applied in the direction of using optical devices, measuring devices, instruments, etc., to achieve data integrity and improve measurement efficiency

Active Publication Date: 2013-11-20
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, the active grinding disc processing system is a complex system involving many external factors, and the pure static surface shape detection results are powerless to further study the various effects of the actual surface shape of the grinding disc during processing on the aspheric primary mirror processing.

Method used

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  • FPGA (Field Programmable Gate Array)-based computer control active lap dynamic surface shape acquisition system and method
  • FPGA (Field Programmable Gate Array)-based computer control active lap dynamic surface shape acquisition system and method
  • FPGA (Field Programmable Gate Array)-based computer control active lap dynamic surface shape acquisition system and method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 Shown, main composition of the present invention is as follows:

[0026] ① High-precision micro-displacement sensor array;

[0027] ② The sub-board responsible for collecting the signals of each sensor;

[0028] ③Responsible for generating the position information of the disc encoder, addressing each sub-board to sample each sensor data, and transmitting the encoder position information and sensor data to the motherboard of the upper computer through the USB interface.

[0029] Each sub-board is independently responsible for the data collection of several sensors in the sensor array. The number of sub-boards should be selected according to the number of sensors. figure 1 Take 6 sub-boards as an example; the main board is responsible for simulating the position information of the machine tool encoder to the dynamic grinding disc deformation co...

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Abstract

The invention discloses an FPGA (Field Programmable Gate Array)-based computer control active lap dynamic surface shape acquisition system and method. The system consists of a sensor array, an acquisition circuit board and an upper computer, wherein the acquisition circuit board comprises a plurality of FPGA acquisition-based daughter boards and an FPGA and USB (Universal Serial Bus) communication-based motherboard; each daughter board is individually used for data acquisition of a plurality of paths of sensors; and the motherboard is used for simulating a machine tool coder to provide positional information for a computer control active lap deformation control system, emitting synchronizing information, storing all data of each daughter mother at a certain moment, meanwhile addressing each daughter board, collecting data acquired and stored by each daughter board in turn and transmitting to the upper computer together with the positional information through a USB chip. According to the system and the method, the dynamic shape of the lap at a certain position in machining can be quantitatively given so as to calculate the error of the lap shape at a certain position with the theoretical shape, and analysis can be made to improve the accuracy of the lap shape.

Description

technical field [0001] The invention belongs to the field of advanced optical manufacturing, and in particular relates to an FPGA-based dynamic surface acquisition system and method for an active grinding disc. Background technique [0002] Computer Control Active Lap (CCAL), as an effective method for processing large-diameter aspheric mirrors, was successfully developed at the University of Arizona in the 1980s and has been used in the world for diameters of Φ900mm. ~Φ8400m mirror processing. Compared with traditional aspheric surface processing methods, CCAL can significantly improve the processing efficiency and processing quality of mirror surfaces. Before the active grinding disc is used to process the mirror, it is necessary to measure its surface shape to obtain the influence function of each driver, and then calculate the required application to each driver according to the surface shape required when the active grinding disc is ground at a certain position on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/245
Inventor 赵洪深李晓今范斌曾志革周家斌
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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