Rotation angular displacement and angular velocity measurement system and method
A measurement system and angular velocity technology, applied in the direction of linear/angular velocity measurement, velocity/acceleration/shock measurement, measuring device, etc., can solve problems such as difficult to achieve full-circle angle measurement, poor stability, and the grating is susceptible to external environment interference, etc. Achieve high resolution, less application restrictions, and expand the application range
Active Publication Date: 2022-01-07
TSINGHUA UNIV
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Problems solved by technology
The angle measurement method of the grating interferometer is a contact measurement, and the grating itself is easily disturbed by the external environment, and the stability is poor
The dual-wavelength interferometric goniometric method and the laser birefringence effect goniometric method obtain angular displacement information by measuring the phase change of the beam during the rotation process, and it is difficult to achieve full-circle angle measurement
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[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below through implementation examples and in conjunction with the accompanying drawings. It should be emphasized that the following descriptions are only exemplary and used to explain the application, rather than to limit the scope and application of the present invention.
[0046] The serial numbers assigned to components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "on", "on the surface" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying t...
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The invention relates to a rotation angular displacement and angular velocity measurement system and method, and the system comprises: a laser which outputs linear polarization laser; a collimating lens which is used for collimating the linear polarization laser; a light splitting and frequency shifting device which comprises a second spectroscope, a first frequency shifter, a second frequency shifter and a third frequency shifter, is arranged on a light path of the linear polarization laser emitted from the collimating lens, performs light splitting on the linear polarization laser, realizes differential frequency shifting, and emits first measuring light and second measuring light to a to-be-measured target, wherein the first measurement feedback light and the second measurement feedback light which are scattered and returned by the target to be measured enter the laser, so that the light intensity of the linear polarization laser output by the laser is modulated; a photoelectric detection device which is used for converting the light intensity signal into an electric signal; and a signal processing device which is used for calculating rotation angular displacement and angular velocity information. The rotation angular displacement and angular velocity measurement system and method provided by the invention have the characteristics of non-contact, high resolution, high precision, full-cycle angle and dynamic measurement.
Description
technical field [0001] The present application relates to the technical field of laser measurement, in particular to a system and method for measuring rotational angular displacement and angular velocity. Background technique [0002] Rotary angular displacement and angular velocity measurement technology is widely used in aerospace, laser precision measurement, electronic product manufacturing and other fields, and plays an important role in modern industry. Traditional rotational angular displacement measurement mainly includes electrical angular displacement sensor measurement based on capacitive angle measurement technology and angular displacement measurement based on optical principle. Angular velocity is the differential result of angular displacement. [0003] The measurement of the electrical angular displacement sensor based on the capacitive angle measurement technology is a contact measurement, which will introduce installation errors during use, which severely l...
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Login to View More IPC IPC(8): G01B11/26G01P3/36G01D21/02
CPCG01B11/26G01P3/366G01D21/02
Inventor 谈宜东徐欣
Owner TSINGHUA UNIV