Optical lens, optical range finding device, optical range finding method and range finding system

Abstract

In order to solve a problem of a detection blind region in a range finding device of a non-coaxial optical structure, the invention discloses a small optical range finding device, a range finding method, a range finding system and a TIR lens. The small optical range finding device comprises an infrared light emitting module, a receiving module and a signal processing and controlling module. The signal processing and controlling module is connected with the infrared light emitting module and the receiving module. The infrared light emitting module emits infrared detection light which is reflected when meeting an object. The receiving module receives infrared detection light reflected by the object, and converts optical signals into electric signals. The signal processing and controlling signal calculates the distance between the small optical range finding device and the object based on a flight time method. The TIR lens equipped with a light guiding structure is arranged on an infrared detection optical path given out by the infrared light emitting module. The light guiding structure is a groove which is arranged in a position, near one side of the receiving module, of a light emitting face the TIR lens.

Description

technical field [0001] The present application relates to a small optical distance measuring device, in particular to a small optical distance measuring device based on Time of Flight (TOF for short), an optical lens, and a distance measuring system. Background technique [0002] In the prior art, the most common optical ranging method is the triangular ranging method, which mainly uses a laser light source to emit detection light. In the triangulation ranging method using a laser light source or the time-of-flight method using a single-point light source, when detecting complex objects, such as grass and other objects, due to the high collimation of the laser light source or single-point light source, it is used for low-altitude aircraft detection. When the height between itself and the ground is high, the ranging results will fluctuate greatly. [0003] In addition, in the existing optical ranging method, the emitted probe light beam is usually not on the same optical axi...

AI Technical Summary

Problems solved by technology

In the triangulation ranging method using a laser light source or the time-of-flight method using a single-point light source, when detecting complex objects, such as grass and other objects, due to the high collimation of the laser light source or single-point light source, it is used for low-altitude aircraft detection. When the height between itself and the ground is high, the ranging results will fluctuate greatly

[0003] In addition, in the existing optical ranging method, the emitted probe light beam is usually not on the same optical axis as the return beam received by the receiving device, and the emitted probe light beam is usually a nearly collimated beam. Such a structure When the distance between the obstacle and the distance measuring device is very close, the obstacle in the field of view of the receiving device cannot be irradiated by the detection beam, and there will be a detection blind area, so that the distance measuring device can measure the distance of the obstacle in the short distance inaccurate or undetectable

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