Distance measuring instrument, distance measuring equipment for measuring cutting length of plate, filtering method and application

Abstract

The invention discloses a distance measuring instrument and distance measuring equipment for measuring the cutting length of a plate. The distance measuring instrument comprise a measuring light generator, a light beam cross section shape modulation device and a light receiver, wherein the measuring light generator is used for emitting a measuring light beam, the light beam cross section shape modulation device is arranged on a measuring light path between the measuring light generator and a measured object, the light beam section shape modulation device comprises a light diffuser and a light shielding device, the light shielding device comprises two light shielding pieces provided with linear light transmitting gaps, and the extension lines of the linear light transmitting gaps are coplanar with the light receiving axis of the light receiver. The distance measurement precision is high. The invention discloses a filtering method and application thereof in distance measurement. The filtering method comprises the steps of measuring a first ambient light; and measuring second ambient light, wherein the measurement data after the background light is filtered is equal to the difference between the second ambient light data and the first ambient light data, so that the measurement time period of the first ambient light measurement step approaches the measurement time period of the second ambient light measurement step. Background light noise can be reduced, and the measurement accuracy is high.

Description

technical field [0001] The invention relates to the technical field of distance measurement, in particular to a distance measuring instrument, a distance measuring device for measuring the cutting length of a plate, a filtering method and an application. Background technique [0002] Generally, ambient light includes natural light, and natural light includes all possible vibration directions perpendicular to the direction of light wave propagation, and also includes light of its wavelength. The natural light on the earth mainly comes from the sun, and the distance between the sun and the earth affects the light intensity on the ground, which is reflected in the four seasons of spring, summer, autumn and winter in the temperate zone. [0003] The optical rangefinder includes a measuring light transmitter and a light receiver, which generally irradiate the measuring light on the measured object and obtain the flight time of the measuring light. The flight time of the measurem...

AI Technical Summary

Problems solved by technology

However, when using an optical rangefinder, the optical receiver will also receive ambient light. Even if an optical filter is installed on the optical path of the optical receiver, the light waves contained in the ambient light that have the same vibration direction and the same wavelength as the measurement light will Formation of noise that affects the accuracy of the time-of-flight of the acquired measurement light

When the light intensity of natural light is strong, the photosensitive element cannot even distinguish the noise-induced output signal from the measured light-induced output signal

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