Orthogonal differential type comparator of diaplacement-current with capability of anti light intensity drift
A current comparator and differential technology, applied in the direction of instruments, electrical devices, electromagnetic measuring devices, etc., can solve the problems of complicated circuits, complex mechanical structures, and the effect of correction depends on machining accuracy, etc., to improve the measurement accuracy. , High cost performance and long service life
Inactive Publication Date: 2005-02-16
ZHEJIANG UNIV
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Problems solved by technology
The pre-calibration method causes a complex mechanical structure, and the effect of the correction depends on the machining accuracy
However, the linearization processing of measurement data requires devices such as A / D and single-chip microcomputer, which complicates the circuit
The second basic problem to be solved by the polarized light displacement sensor is the drift of the light intensity of the light source. This is a common problem in semiconductor light-emitting devices. At present, all kinds of mature stabilized light sources can only guarantee the stability of 5-10‰, and the stability ization requires complex feedback control circuits
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[0023] Such as figure 1 , 2 As shown, the present invention includes a light-emitting element 2, a polarizer 3, a Faraday optical element 5 with a solenoid excitation coil 4 wound outside, an orthogonal double analyzer 6, two photodetection elements 7, 8. The output terminals of the two photodetection elements 7 and 8 are respectively connected to the two input terminals of the comparison amplifier 9, the output terminal of the comparison amplifier 9 is connected to the current drive and detection device 1, and the current drive output terminal of the current drive and detection device 1 It is connected with the solenoid excitation coil 4 in the electromagnetic device, and the current output end of the current drive and detection device 1 is the output of the displacement measurement system. The comparative amplifier 9 is realized by using the LMX331 comparative amplifier chip of MAXIM. The current drive and detection device 1 is composed of an ordinary 220V power supply to ...
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The following parts are installed in instrument from left to right: luminous element, polarizer, Faraday optical rotation with solenoid exciting coil wound its outside, orthogonal double analyzers and two photoelectric detection component, which are connected to two ends of comparison amplifier. The output ends of the comparison amplifier are connected to a current driven and detection device. The current drive output end of the current drive and detection device is connected to the solenoid exciting coil, and its current output end is as the output of displacement measuring system. Comparing Faraday rotatory polarization angle caused by controlled current with polarization angle caused by measured displacement as well as comparing orthogonal differential signals of dual optical paths realize linear conversion between displacement and current and eliminate influence of light intensity drift so as to raise measuring accuracy.
Description
technical field [0001] The invention relates to a metering device characterized by an optical method, which is an anti-light intensity drift orthogonal differential displacement-current comparator based on a polarized light detection method and Faraday magneto-optic effect. Background technique [0002] Linear displacement or angular displacement is a basic physical quantity, and displacement sensors are widely used in scientific research and industrial applications. Among the existing displacement sensors, the potentiometer type displacement sensor is widely used. It has a simple structure and low price, but it is a typical contact sensor with low life, precision and reliability. The polarized light displacement sensor can have a structure similar to that of the potentiometer type displacement sensor, but has the advantage that the sensing part is non-contact. One of the fundamental problems to be solved by polarized light displacement sensors is their inherent nonlinearit...
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IPC IPC(8): G01B7/04G01B7/30
Inventor 李伟王耀军卢圣
Owner ZHEJIANG UNIV