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Laser distance measuring device

A technology of laser distance measurement and laser module, which is applied in the direction of measuring device, measuring distance, optics, etc., can solve the problem that the photosensitive surface of the photosensitive element cannot be reduced to the same way as the imaging spot, so as to improve the stability of imaging and ensure the measurement distance performance and improved measurement stability

Active Publication Date: 2011-12-14
NANJING CHERVON IND
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Problems solved by technology

[0026] Therefore, in the non-coaxial optical path scheme, due to the existence of short-range imaging spot shift phenomenon, it is not possible to achieve the best signal-to-noise ratio by reducing the photosensitive surface of the photosensitive element to the same imaging spot.

Method used

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Embodiment Construction

[0063] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0064] Figure 7 It is a schematic diagram of the laser ranging device of the present invention, which mainly shows the laser emitting and receiving system parts. The laser distance measuring device includes: a laser module 907 for producing a collimated measuring beam 909, the laser module 907 consists of a laser generator that generates a high-frequency modulated measuring beam 909 and a collimator that collimates the measuring beam 909 Composed of lenses, the collimated measurement beam 909 is converted into a second beam 910 by a light deflection device 908, and the second beam 910 is projected onto a naturally rough target surface 901 to form a spot 902 on the target surface 901; a receiving objective lens 905 is used to When receiving the reflected light beam reflected back by the target surface 901, the receiving...

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Abstract

The invention provides a laser ranging apparatus. The apparatus comprises: a laser module for generating a collimated detection beam; a receiving objective lens for receiving a reflected beam of the detection beam, wherein the receiving optical axis of the receiving objective lens is parallel to the emergent optical axis of the detection beam; a photoelectric converter for carrying out photoelectric conversion for an image generated by the reflected beam on a focal plane of the receiving objective lens, wherein a sensitization surface of the photoelectric converter is positioned on the focal plane of the receiving objective lens; a control and analysis system connected with the laser module and the photoelectric converter, wherein the size of the sensitization surface of the photoelectricconverter matches with the size of the imaging light spot of the receiving objective lens. According to the present invention, influence on effective light signals due to daylight and noise is reduced, such that the effective light signals are stood out from the background light; by using the photosensitive element with the small sensitization surface, and the small imaging light spot, the weak light signal reflected from the distant place can be aggregated at a maximum, therefore, with adopting the laser ranging apparatus under the sunlight, the ranging capability can be effectively enhanced, and the ranging range is further far.

Description

technical field [0001] The invention relates to a distance-measuring device for measuring the distance of a measured object, in particular to a laser distance-measuring device which uses a laser signal emitted by a laser generator as a distance-measuring signal for distance measurement. Background technique [0002] Laser ranging devices are widely used in construction, interior decoration and other fields. However, with existing laser range finders, the accuracy level and measurement range significantly deteriorate in daylight. The main reason is that under sunlight, the background light formed by sunlight enters the receiving system of the rangefinder together with the effective light signal, resulting in a decrease in the signal-to-noise ratio, which leads to a decrease in the ranging capability. [0003] In order to improve the ranging ability in daylight, there are the following measures, but all of them have certain limitations. [0004] 1. Increase the intensity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C3/32G02B17/04
Inventor 杨德中胡云峰许阳建
Owner NANJING CHERVON IND
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