Laser distance measuring device

Abstract

The invention discloses a laser ranging device, comprising a light source part, an object lens group, a light forwarding part and a light receiving part, wherein the light source part is used for transmitting a ranging light, the object lens group comprises a front film and a positive film which are composed of convex lenses, as well as a negative film composed of concave lenses; the light forwarding part is used for forwarding the ranging light to a measured target through the object lens group, and the light receiving part is used for receiving the ranging light which is reflected by the measured target and returned through the object lens group, wherein a first through hole is arranged at the centers of the positive film and the negative film. The laser ranging device disclosed by the utility model has a higher ranging accuracy.

Description

technical field [0001] The invention relates to a distance measuring device, in particular to a laser distance measuring device. Background technique [0002] At present, the design principle of the laser distance measuring device is similar, and its basic structure is already known. For example, the Chinese invention patent with publication number CN1512136A and the Chinese utility model patent with publication numbers CN202002638U and CN201203667Y respectively disclose a laser distance measuring device. [0003] now refer to figure 1 Briefly explain the utility model patent with the notification number CN202002638U. [0004] figure 1 The shown laser distance measuring device includes a light source part 1 for emitting distance measuring light, a light forwarding part 2 for transmitting the distance measuring light through the objective lens group 4 to the measurement target 6, and a light forwarding part 2 for receiving the light reflected by the measurement target 6 an...

AI Technical Summary

Problems solved by technology

[0012] In this laser distance measuring device, when the distance measuring light is emitted from the second deflection member 203 to the objective lens 4, it must be weakly reflected on the rear end surface 4A of the objective lens 4, and part of these reflected light will be projected to the first lens after being diffused. The three optical path deflecting components 501 will then be reflected to the second optical path deflecting component 203 through the third optical path deflecting component 501, and then reflected into the receiving optical fiber 502 by the second optical path deflecting component 203, so as to measure the reflection reflected by the measurement target 6 The distance light is finally reflected into the receiving light 502 to form interference. When these interferences are measured in the prism ranging mode, due to the strong return light signal, no large error will be formed; but when measuring in the prism-free ranging mode, due to the return light The signal is very weak, which will lead to large errors

[0013] This kind of error is a periodic error that occurs periodically, which is unstable and unpredictable, and affects the ranging accuracy

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