A small infrared distance measuring device

Abstract

The invention relates to a miniature infrared range finding apparatus including an outer cover, an inner bracket, a bottom cover, an infrared light emitting module and a photoelectric ranging module, the bottom cover is fixed at the opening of the bottom of the outer cover, the inner bracket is fixed inside the outer cover, and the infrared light emitting module and the photoelectric ranging module are fixed on the inner bracket. The infrared light emitting module emits infrared detection light, the infrared detection light is reflected by the object to be measured, the photoelectric ranging module receives the reflected infrared detection light and calculates the distance between the miniature infrared range finding apparatus and the object to be measured based on the flight time method. The infrared light emission light source is a divergent infrared light source, and a light guide device is arranged on the outer cover for reducing the detection blind area of the infrared detection light. The miniature infrared range finding apparatus is small in size, light in weight, and low in energy consumption, and has the outdoor environmental light resistant characteristic. The measured data is smooth, and the miniature infrared range finding apparatus can be particularly applied to the altitude measurement of the aircraft and terrain following of the aircraft, and can effectively reduce the ranging blind area.

Description

technical field [0001] The present application relates to a photoelectric distance measuring device, in particular to a small infrared distance measuring device based on the Time of Flight (TOF) method, especially for measuring the height between the aircraft and the ground, and the terrain following of the aircraft. 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. However, using the triangulation method: (1) It is greatly affected by ambient light, and the distance cannot be accurately measured when working outdoors; (2) It is necessary to set the laser light source and the distance measuring unit to have a certain angle and distance and be at the same The supporting structure in the plane limits the design of the structure, making the distance measuring device larger in size. [0003] Moreover, in the triangulation ranging method using a ...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the existing technology: (1) It is greatly affected by ambient light, and cannot accurately measure the distance when working under strong outdoor light; (2) The distance measuring device is bulky; (3) When detecting objects such as bushes , due to the high collimation of the laser light source or single-point light source, when the low-altitude aircraft is used to detect the height between itself and the ground, the ranging result will fluctuate greatly; (4) The ranging device has a detection blind spot at a short distance. One or all of the above-mentioned problems with optical measurement methods, according to one aspect of the present application, a small infrared distance measuring device based on the time-of-flight method is provided

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