Electrooptical angle measurer

An angle measurement device, electro-optical technology, applied in the direction of measuring devices, using optical devices, using electric/magnetic devices to transmit sensing components, etc., can solve the problems of difficult implementation, complex structure, inconvenient use, etc., and achieve compact structure, long-term The effect of stable work

Inactive Publication Date: 2004-09-08
NANKAI UNIV
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  • Description
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Problems solved by technology

The disadvantage is that the structure is more complex, the requirements for the working environment are very high, and it is not convenient to use at the work and testing site
This is difficult to achieve with the existing angle measurement technology

Method used

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  • Electrooptical angle measurer

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Embodiment

[0019] An example of an electro-optical angle measuring device is figure 1 shown. It uses the compact grating external-cavity semiconductor laser developed by the present invention as the light source, loads the rotation angle information on the light wave through the lithium niobate electro-optic crystal, and uses the polarization splitting effect of the Wollaston prism and phase-locked differential amplification for signal demodulation technology. In the figure, 1 is a 650nm semiconductor laser, 2 is a grating, the blaze wavelength is 500nm, 1200 lines / mm, 3 is a mirror coated with metal film, the line width of the grating external cavity semiconductor laser is 0.06nm, and the power is greater than 2mw; 4 is a polarizer, 5 is 4×5×10mm 3 Lithium niobate electro-optic crystal, 6 is semiconductor laser driving power, 7 is low frequency signal source, 8 is low frequency signal amplifier, 9 is 650nm1 / 4 wave plate, 10 is GCL-71111 Wollaston prism, 11 is two silicon Photocell, 1...

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Abstract

The present invention relates to one kind of electrooptical angle measurer and belongs to the field of electrooptical detection technology. The present invention aims at real-time monitoring coaxial relative rotation angle of emitting platform and receiving platform separated by certain distance to realize second level angle measurement. The technological scheme of the present invention includes measurer comprising three parts of emitting part, receiving part and electric control part; grating outer-cavity semiconductor laser as light source; electrooptical lithium niobate crystal for loading angle information; polarizing light splitter and light detector for demodulating information; and differential processing technology used in processing obtained electrical signal. The present invention can complete angle measurement in second level precision with an angle measurer with compact structure, high vibration resistance and high long term stability.

Description

technical field [0001] The invention relates to an electro-optical angle measuring device, which belongs to the technical field of photoelectric detection. Background technique [0002] Angle measurement is an important part of metrology, widely used in machinery, optics, aviation, aerospace, navigation and other fields. At present, angle measurement is divided into three categories: mechanical method, electromagnetic method and optical method. Generally, the performance of the angle measuring device is measured from the measurement accuracy, stability, reliability and service life. In addition, the measurement method can be selected according to the requirements of the application and measurement accuracy. [0003] Mechanical angle measurement is based on the circular indexing technology based on the principle of mechanical indexing and positioning. Due to the use of differential technology, after two or more gear plates with different numbers of teeth mesh, the minimum ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26G01D5/12H04B7/00
Inventor 吕福云盛秋琴郭文刚范宇罗绍均李春雷
Owner NANKAI UNIV
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