A non-contact torsion angle measurement system and measurement method

Abstract

A non-contact torsion angle measurement system and measurement method belong to the field of photoelectric measurement technology. The problem that the torsion angle measurement system and measurement method in the prior art cannot be applied to non-contact, long-distance, and full-circle 360° torsion angle measurement is solved. The measurement system of the present invention includes a transmitting optical path unit, a receiving optical path unit and a control system, wherein the transmitting optical path unit includes a light source, a transmitting grating, an illumination lens, and a transmitting lens; the receiving optical path unit includes a receiving lens, a photoelectric encoder, a servo motor, and a receiving grating And the image sensor; the control system analyzes the image collected by the image sensor, performs servo control on the servo motor according to the analysis result, and collects the angle data of the photoelectric encoder at the same time, processes it combined with the image data, and calculates the measurement result. The measuring system and measuring method are suitable for non-contact, long-distance and full-circle 360° torsion angle measurement.

Description

technical field [0001] The invention belongs to the technical field of photoelectric measurement, and in particular relates to a non-contact torsion angle measurement system and measurement method, and is especially suitable for non-contact, long-distance, full-circle 360° torsion angle measurement. Background technique [0002] The measurement of torsion angle is an important part of angle metrology science, especially the measurement of high-precision torsion angle is of great significance and role in many fields such as precision machining, aerospace, military and communication. Because of its wide application, various research units have conducted a large number of experimental studies and obtained many measurement methods. According to the requirements of different measurement accuracy, measurement range and degree of automation, it can be divided into mechanical measurement, electromagnetic measurement, electronic measurement and photoelectric measurement. Among them,...

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Problems solved by technology

However, even though there are many methods for measuring the torsion angle, in the actual measurement, there are still some insurmountable problems, such as: some measurements need to be completely non-contact, and the measurement distance is long (10m-100m), while the commonly used photoelectric encoder Although it is a non-contact measurement, the two parts of the measurement must be very close, so this measurement method cannot be used; some measurements not only require high measurement accuracy, but also require a large measurement range, and the self-collimation method or light interference method is used. Although the method can achieve high measurement accuracy, the measurement range is extremely small and cannot meet the angle measurement in a wide range.

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