Tumble angle measuring method and measurer
A roll angle measurement and light measurement technology, applied in measurement devices, instruments, optical devices, etc., can solve problems such as measurement nonlinear errors, and achieve the effects of improving adaptability, compact structure, and improving sensitivity
Inactive Publication Date: 2002-02-13
TSINGHUA UNIV
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In addition, although is a nonlinear function of α on the whole, it is hoped that the two can maintain a linear relationship within a large enough measurement range, that is, K a Keep it constant, otherwise it will introduce non-linear error to the measurement
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Embodiment 1
[0079] Embodiment 1 of the device of the present invention: SGJ-1 type transverse Zeeman dual-frequency laser is adopted, and the frequency stabilization accuracy is 10 -7 , The frequency difference is 269K, the cut-off frequency of the two photodetectors is 2M, the phase meter adopts the Danish phase meter (Phase MeterType: 2997), and the phase measurement accuracy is 0.1 degree. On the basis of the principle of the present invention, the residual ovalization of the transverse Zeeman laser itself is directly used, so the 1 / 4 wave plate can be omitted and the drift link can be reduced. This system could theoretically achieve a multiplication factor of more than 200, and the total sensitivity multiplication factor is currently 110.
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The present invention belongs to the field of optical angle measuring technology, and includes setting half-reflecting mirror in the output light axis of Zeeman laser, setting half wave plate perpendicularly in the transmission light path of the half-reflecting mirror, and setting half wave plate, analyzer, one first photoelectronic detector successively and perpendicular second photoelectronic detector in the reflection light path; and one phase meter with input connected to the output of the first and the second photoelectronic detectors and output to the computer. The present invention hasstrengthened non-linearity and 4 times raised sensitivity, and the close measuring detectors and light source results in compact structure and ever high practicability.
Description
Technical field: [0001] The invention belongs to the technical field of optical measurement of angles, in particular to a roll angle measurement method and a roll angle measuring instrument thereof. Background technique: [0002] Roll angle is an important parameter in error compensation. The roll angle in the horizontal plane can be measured with an electronic level, and there are ready-made instruments. For the roll angle in the vertical plane, although there are methods such as polarimetry, the accuracy has not been very high and cannot meet the needs of practical applications. [0003] Kolenkiewicz of the former Soviet Union proposed in 1974 to use the left and right circularly polarized light of the dual-frequency longitudinal Zeeman laser to realize the roll angle measurement. Its structure and principle are as follows: figure 1 shown. [0004] In the figure, the source of the dual-frequency laser is the longitudinal Zeeman laser, the sensor device is the analyzer 1...
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IPC IPC(8): G01B11/26
Inventor 殷纯永柳忠尧林德教蒋弘
Owner TSINGHUA UNIV
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