A laser ranging optical system and its main wave signal sampling method

Abstract

The invention relates to a laser range finding optical system and a dominant wave signal sampling method thereof. The system comprises reception object lenses, a field lens, a transformation object lens and a photoelectric detector which are arranged in order, the reception object lenses, the filed lens and the transformation object lens are arranged in the same optical axis, the field lens is placed at the focus of the reception object lenses, a first reflector is arranged between the reception object lenses and the field lens, the center of the first reflector is placed in the optical axes of the reception object lenses, the included angle between the first reflector and the optical axis of each reception object lens is 45 degree, a second reflector is arranged at one side of the first reflector, the center of the first reflector and the center of the second reflector are placed in the same straight line, and the straight line is vertical to the optical axes of the reception object lenses. The system is simple in structure, low in cost and high in measuring precision, effectively prevents the photoelectric detector from damage of too storing dominant wave signals, and is characterized by wide application range.

Description

technical field

[0001] The invention belongs to the technical field of laser ranging, and in particular relates to a laser ranging optical system and a main wave signal sampling method thereof. Background technique

[0002] Laser ranging refers to a measurement technology that uses a laser beam directed at a ranging target to measure the distance to a target. The laser beam is emitted by the laser light source, most of the laser beam is emitted to the ranging target through the laser emission system, and is reflected by the ranging target and returned as an echo laser beam; the echo laser beam is received by a photodetector as an echo laser beam. A small part of the laser beam converges to the photodetector as the main wave signal; the measured distance is obtained through the comparison and analysis of the echo signal and the main wave signal, combined with the ranging equation.

[0003] In the existing laser ranging system, there are two design schemes for the optical sys...

Examples

Embodiment 1

[0029] like figure 1 As shown, a laser ranging optical system includes a receiving objective lens 1, a field lens 4, a transforming objective lens 5 and a photodetector 6 arranged in sequence, and the surfaces of the receiving objective lens 1, the field lens 4 and the transforming objective lens 5 are all coated with a pair of A film with high transmittance of the laser beam 71 , the photodetector 6 is provided with a photosensitive surface that responds to the laser beam 71 , and the photosensitive surface is set at the focal position of the conversion objective lens 5 .

[0030] The receiving objective lens 1 is used for receiving the receiving beam 9, the field lens 4 converges the sampling beam 83 and the receiving beam 9 that deviate from the focal point of the receiving objective lens 1, and the transforming objective lens 5 is used for changing the sampling beam 83, the receiving beam 9. The spot size of the receiving beam 9 is matched with the size of the photosensiti...

Embodiment 2

[0033] like figure 1 As shown, the receiving objective lens 1, the field lens 4 and the transforming objective lens 5 are arranged in a coaxial structure, the field lens 4 is located at the focal point of the receiving objective lens 1, and the receiving objective lens 1 and the field lens 4 are arranged between There is a reflector one 2, and the reflector one 2 adopts the edge clamping method, and its center is located on the optical axis of the receiving objective lens 1, and the reflector one 2 and the optical axis of the receiving objective lens 1 are arranged at 45° to promote the emission The optical path and the receiving optical path are coaxial.

[0034] One side of the reflecting mirror 2 is provided with a reflecting mirror two 3, the reflecting mirror two 3 is arranged in parallel with the optical axis of the receiving objective lens 1, and the centers of the reflecting mirror one 2 and the reflecting mirror two 3 are located on the same straight line. It is perp...

Embodiment 3

[0037] like Figure 1-2 As shown, the laser beam 71 is a pulsed laser, the power is P, the beam diameter is 20mm, the pulse width is 10ns, and the wavelength is 1064nm. T1=0.2%, the reflectivity of the mirror 23 to the laser beam 71 is R2=90%, the aperture of the through hole 11 is 25mm, and the method for sampling the main wave signal of the laser ranging optical system in this embodiment, It includes the following steps:

[0038] (1) The laser beam 71 is incident on the mirror 1 2 at an incident angle of 45°. The incident side of the laser beam 71 is different from the position where the mirror 2 3 is located. A part of the laser beam 71 is blocked by the mirror 1 2 is reflected and penetrated through the through hole 11 as the emission beam 72; the other part of the laser beam 71 is transmitted through the mirror 1 2 as the transmission beam 81, and the power of the transmission beam 81 is P×0.2%, that is, P× (1-99.8%);

[0039] (2) The transmitted light beam 81 is incid...

technical field

[0001] The invention belongs to the technical field of laser ranging, and in particular relates to a laser ranging optical system and a main wave signal sampling method thereof. Background technique

[0002] Laser ranging refers to a measurement technology that uses a laser beam directed at a ranging target to measure the distance to a target. The laser beam is emitted by the laser light source, most of the laser beam is emitted to the ranging target through the laser emission system, and is reflected by the ranging target and returned as an echo laser beam; the echo laser beam is received by a photodetector as an echo laser beam. A small part of the laser beam converges to the photodetector as the main wave signal; the measured distance is obtained through the comparison and analysis of the echo signal and the main wave signal, combined with the ranging equation.

[0003] In the existing laser ranging system, there are two design schemes for the optical sys...

Examples

Embodiment 1

[0029] like figure 1 As shown, a laser ranging optical system includes a receiving objective lens 1, a field lens 4, a transforming objective lens 5 and a photodetector 6 arranged in sequence, and the surfaces of the receiving objective lens 1, the field lens 4 and the transforming objective lens 5 are all coated with a pair of A film with high transmittance of the laser beam 71 , the photodetector 6 is provided with a photosensitive surface that responds to the laser beam 71 , and the photosensitive surface is set at the focal position of the conversion objective lens 5 .

[0030] The receiving objective lens 1 is used for receiving the receiving beam 9, the field lens 4 converges the sampling beam 83 and the receiving beam 9 that deviate from the focal point of the receiving objective lens 1, and the transforming objective lens 5 is used for changing the sampling beam 83, the receiving beam 9. The spot size of the receiving beam 9 is matched with the size of the photosensiti...

Embodiment 2

[0033] like figure 1 As shown, the receiving objective lens 1, the field lens 4 and the transforming objective lens 5 are arranged in a coaxial structure, the field lens 4 is located at the focal point of the receiving objective lens 1, and the receiving objective lens 1 and the field lens 4 are arranged between There is a reflector one 2, and the reflector one 2 adopts the edge clamping method, and its center is located on the optical axis of the receiving objective lens 1, and the reflector one 2 and the optical axis of the receiving objective lens 1 are arranged at 45° to promote the emission The optical path and the receiving optical path are coaxial.

[0034] One side of the reflecting mirror 2 is provided with a reflecting mirror two 3, the reflecting mirror two 3 is arranged in parallel with the optical axis of the receiving objective lens 1, and the centers of the reflecting mirror one 2 and the reflecting mirror two 3 are located on the same straight line. It is perp...

Embodiment 3

[0037] like Figure 1-2 As shown, the laser beam 71 is a pulsed laser, the power is P, the beam diameter is 20mm, the pulse width is 10ns, and the wavelength is 1064nm. T1=0.2%, the reflectivity of the mirror 23 to the laser beam 71 is R2=90%, the aperture of the through hole 11 is 25mm, and the method for sampling the main wave signal of the laser ranging optical system in this embodiment, It includes the following steps:

[0038] (1) The laser beam 71 is incident on the mirror 1 2 at an incident angle of 45°. The incident side of the laser beam 71 is different from the position where the mirror 2 3 is located. A part of the laser beam 71 is blocked by the mirror 1 2 is reflected and penetrated through the through hole 11 as the emission beam 72; the other part of the laser beam 71 is transmitted through the mirror 1 2 as the transmission beam 81, and the power of the transmission beam 81 is P×0.2%, that is, P× (1-99.8%);

[0039] (2) The transmitted light beam 81 is incid...

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