Range-variable laser trigonometry displacement measuring device and method

Abstract

The invention discloses a range-variable laser trigonometry displacement measuring device and method. A trigonometry laser displacement sensor generally adopts a secondary measuring method, the measuring cost is high, and the measuring time is long. The device comprises a collimation laser emitter, a base, an auxiliary measuring focusing lens, an auxiliary measuring position sensing element, an actual measuring position sensing element and an actual measuring focusing lens. The device has the advantages that the range is changed through the position of the auxiliary measuring position sensing element, so as to meet the requirements of actual measuring on different ranges; when a measured object deviates from the measuring range of an actual measuring module, the position of the measured object is provided by the auxiliary measuring module, then a measuring platform is guided to move, and the measured object returns back into the range of the actual measuring module; the small-range precise measuring function and the variable large range size measuring function are integrated, the contradiction between the range and precision of the trigonometry laser displacement sensor is solved, and the quick and high-precision non-contact type measuring is realized for complicated curves.

Description

technical field [0001] The invention belongs to the technical field of displacement measurement based on optics, and relates to a displacement measurement device and method based on laser triangulation, in particular to a variable-range laser triangulation displacement measurement device and method. Background technique [0002] Laser displacement sensor is a non-contact displacement measurement system based on optical theory. According to the measurement principle, it is divided into triangulation laser displacement sensor and echo analysis laser displacement sensor. Among them, the triangulation laser displacement sensor is generally suitable for short-distance measurement, while the echo analysis laser displacement sensor is used for long-distance measurement. The triangulation laser displacement sensor is mainly composed of a light source (laser beam), a collimating lens, a focusing lens and a photosensitive position sensitive element (such as PSD, CCD, CMOS). Compared ...

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Problems solved by technology

[0006] The secondary measurement method solves the contradiction between the range and accuracy when using the triangular laser displacement sensor to a certain extent, but the secondary measurement requires at least two sensors, and the measurement cost is high

In addition, the secondary measurement needs to switch the sensor. After switching, the pose and coordinate system of the sensor need to be calibrated, which increases additional measurement time.

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