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Ranging device capable of raising signal to noise rate and method thereof

A distance measuring device and a signal-to-noise ratio technology, which are applied in the field of distance measuring devices that can improve the signal-to-noise ratio, and can solve the problems of a large number of measurement errors, user inconvenience, and low reflected light energy.

Active Publication Date: 2012-03-21
PIXART IMAGING INC
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Problems solved by technology

However, when the reflectivity of the surface of the object to be measured is low, the energy of the reflected light generated by the object to be measured is low, which makes the distance measuring device susceptible to the influence of background light (noise), resulting in a large measurement error, causing inconvenience to the user

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  • Ranging device capable of raising signal to noise rate and method thereof
  • Ranging device capable of raising signal to noise rate and method thereof
  • Ranging device capable of raising signal to noise rate and method thereof

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Embodiment Construction

[0027] Please refer to figure 1 . figure 1 It is a schematic diagram illustrating the distance measuring device 100 according to the first embodiment of the present invention. Such as figure 1 As shown, the distance measuring device 100 and the object to be measured O 1 The distance between them is D, and the distance measuring device 100 is the distance D to be measured. The distance measuring device 100 includes a light emitting / sensing control circuit 110, a light emitting component 120, a light sensing group 130, a distance calculation circuit 140, a background calculation circuit 150, a frequency adjustment circuit 160, and a light focusing module 170 .

[0028] Light emitting / sensing control circuit 110, used to generate a light emitting period signal S LD , shutter period signal S ST1 with S ST2 , the first-stage signal S P , a detection frequency signal S FQ , and a read signal S RE . Lighting cycle signal S LD , shutter period signal S T1 with S T2 have ...

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Abstract

The invention discloses a method capable of raising the signal to noise ratio for a spacing device, comprising the following steps: giving off detection light by a lighting assembly in lighting time and directing it to the object to be detected so as to produce reflection light, wherein when the lighting assembly starts giving off detection light, after certain delay time, a light sensing assembly senses the energy of the reflection light, and produces a light sensing signal based on it; obtaining the flying time of light coming and going between the spacing device and the object to be measured according to the energy of the detection light and the light sensing signal; obtaining the distance to be measured between the spacing device and the object to be measured according to the light flying time. Because the distance to be measured is bigger than the known shortest distance to be measured, the method can be used to calculate an appropriate delay time such that the reflecting light is launched to the light sensing assembly after the delay time. Then, the light sensing assembly does not feel the background light in the delay time, therefore the signal to noise ratio of the light sensing signal can be raised.

Description

technical field [0001] The present invention relates to a distance measuring device and its method, more specifically, to a distance measuring device and its method which can improve the signal-to-noise ratio. Background technique [0002] In the known technology, the distance measuring device emits detection light from the object to be detected, and receives reflected light generated by reflecting the detection light from the object to be detected. The distance measuring device can calculate the distance between the distance measuring device and the object to be measured by measuring the time required for the detection light to go back and forth between the distance measuring device and the object to be measured. However, when the reflectivity of the surface of the object to be measured is low, the energy of the reflected light generated by the object to be measured is low, which makes the distance measuring device susceptible to the influence of background light (noise), r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C3/00G01C3/32
Inventor 许恩峯张彦闵
Owner PIXART IMAGING INC
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