CN204740345U - Pulsed laser range finder optic system - Google Patents
Pulsed laser range finder optic system Download PDFInfo
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- CN204740345U CN204740345U CN201520371351.3U CN201520371351U CN204740345U CN 204740345 U CN204740345 U CN 204740345U CN 201520371351 U CN201520371351 U CN 201520371351U CN 204740345 U CN204740345 U CN 204740345U
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Abstract
The utility model discloses a pulsed laser range finder optic system, including laser emitter, laser detector and collimation system, polarizing beam splitter 1, laser emitter arranges one side of polarizing beam splitter 1 in, polarizing beam splitter 1's opposite side is arranged in to the laser detector, faraday rotator, half -wave plate and a mirror have been placed respectively separately to transmitted light one side and reverberation one side at polarizing beam splitter 1, and polarizing beam splitter 1, faraday rotator, half -wave plate and mirror coaxial are placed, the utility model provides a pulsed laser range finder optic system has reduced the optical loss of traditional laser rangefinder system, has promoted the dynamic of system to make distance measurement farther, simultaneously, adopt the utility model discloses a problem of reverberation and optical axis nonparallel can be avoided in the design of pulsed laser range finder light path for distance measurement is more accurate.
Description
Technical field
The utility model relates to range finder, is specifically related to a kind of pulse laser range finder light path system.
Background technology
Reception and the transmitting light path of conventional laser range measurement system are mutually independently mostly, namely at transmitting terminal, the light beam that laser instrument sends is by sending after a lens combination collimation, and the laser returned from measured object is then focused on the detector of laser distance measuring system by another different lens combination.Adopt in the laser distance measuring system of launch and accept altogether light path at other, receiving light path by realizing launching the mode adding catoptron or lens inside and outside light path or lens are dug a breach, thus so that the laser returned from measured object is converged on detector.
In traditional laser distance measuring system, mutually independently launching and receiving light path cause reflected light and optical axis not parallel, thus make range observation accurate not.On the other hand, the light along former road retrieval system cannot be collected into, and causes system acceptance efficiency to reduce, thus causes that system loss is large, Dynamic Range reduces, and systematic survey distance is shortened.Although the laser distance measuring system that other above-mentioned launch and accept are total to light path is better than legacy system performance, but still can cause light loss to a certain degree.
Utility model content
The utility model is intended to one of technical matters existed in solution prior art, for this reason, an object of the present utility model there are provided a kind of common light path device of range finder using laser, be intended to the light loss reducing conventional laser range measurement system, improve the dynamic range of system, thus make range observation farther.Meanwhile, adopt laser distance measuring system of the present utility model can avoid reflected light and the uneven problem of optical axis, make range observation more accurate.
It should be noted that, the utility model completes based on the following discovery of inventor:
According to an aspect of the present utility model, the utility model provides a kind of pulse laser range finder light path system, comprises generating laser, and laser detecting device and colimated light system, also comprise
Polarizing beam splitter 1, described generating laser is placed in the side of polarizing beam splitter 1, and described laser detecting device is placed in the opposite side of polarizing beam splitter 1;
Faraday rotator, half-wave plate and mirror is placed with separately respectively, the coaxial placement of polarizing beam splitter 1, Faraday rotator, half-wave plate and mirror in the transmitted light side of polarizing beam splitter and reflected light side;
Laser emission light path, the laser that laser emitter is launched passes through the transmittance and reflectance of polarizing beam splitter 1, be divided into two bundle laser, described two bundle laser are respectively successively by Faraday rotator, half-wave plate, again by the reflection of mirror, inject polarizing beam splitter 2, by the transmittance and reflectance of polarizing beam splitter 2, pool beam of laser, pass through colimated light system.
Laser pick-off light path, after the laser of measured object reflection passes through colimated light system, again by the transmittance and reflectance of polarizing beam splitter 2, be divided into two bundle laser, described two bundle laser respectively by mirror reflection, more successively by half-wave plate and Faraday rotator, inject polarizing beam splitter 1, by the transmittance and reflectance of polarizing beam splitter 1, pool beam of laser, get back to laser detecting device.
Laser emission light path and laser pick-off light path light path altogether.
In addition, according to the utility model above-described embodiment, range finder using laser light path system can also have following additional technical characteristic:
In Laser emission light path, laser is 45 degree by the laser after half-wave plate by the Faraday rotator anglec of rotation.
In laser pick-off light path, laser is 45 degree by the laser after Faraday rotator by the half-wave plate anglec of rotation.
The utility model mainly passes through polarizing beam splitter, Faraday rotator, wave plate by the light beam of laser instrument transmitting in laser distance measuring system according to different polarization state light splitting, and makes the light of different polarization by different light paths.And converged to the detector of system by different light paths from the light beam that measured object returns according to different polarization states.In this design, although the light of two different polarization states in range measurement system by different light paths, the light of launching and receiving is light path altogether, thus avoids reflected light and the uneven problem of optical axis.
The utility model principle is as follows, the transmitting light path of laser distance measuring system as shown in Figure 1, after laser instrument sends laser, first be divided into the orthogonal two-beam of polarization via polarization spectroscope 1, next, the polarization of this two-beam can be rotated 45 ° by Faraday rotator respectively, then through half-wave plate, makes this two-beam obtain the polarization vertical with original state.Therefore, the light that originally can penetrate polarizing beam splitter 1 is reflected when leaving polarizing beam splitter 2, and the light being originally polarized optical splitter 1 reflection can penetrate when leaving polarizing beam splitter 2, finally, this two-beam overlaps at polarizing beam splitter 2 place, sends from laser distance measuring system through colimated light system.
The receiving light path of laser distance measuring system as shown in Figure 2, the light of laser distance measuring system is reflected back into through measured object, first can be polarized optical splitter 2 and be divided into the orthogonal two-beam of polarization, next, the polarization state of this two-beam is first rotated 45 ° by half-wave plate, then becomes initial polarization via Faraday rotator.Therefore, the light that originally can penetrate polarizing beam splitter 2 is still when leaving polarizing beam splitter 1 and penetrates, and the light that originally can be polarized optical splitter 2 reflection is still reflected when leaving polarizing beam splitter 1, finally, this two-beam overlaps at polarizing beam splitter 1 place, and delivers in detector.
And other light path systems of the prior art; usually can adopt and allow the laser of laser transmitter projects first pass through centre by the mirror hollowed out; again through colimated light system; laser is sent range finder outer as shown in Figure 3; the laser returned is after colimated light system; light beam gets to mirror can be reflected onto laser detection system as shown in Figure 4 by the part hollowed out, and is hollowed out out when light beam gets to mirror, then can not receive.Unaccredited light is exactly the source accepting light loss.Suppose that the luminous energy through colimated light system is A0, the energy passed is A1, and its loss is A1/A0.
The beneficial effects of the utility model: the utility model reduces the light loss of conventional laser range measurement system, improve the dynamic range of system, make range observation farther.Avoid reflected light and the uneven problem of optical axis simultaneously, make range observation more accurate, compared with the scheme of other common light paths, also without the need to lens additional in light path or catoptron, light path does not have segment beam and is lost.
The utility model also utilizes the characteristics of non-reciprocity of Faraday rotator, and collocation possesses the wave plate of reciprocity property, and making reflected light when getting back to polarizing beam splitter, is converge on detector, but not in return laser light transmitter.
Additional aspect of the present utility model and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
A kind of range finder using laser Laser emission light path schematic diagram in the embodiment 1 that Fig. 1 provides for the utility model
A kind of range finder using laser laser pick-off light path schematic diagram in the embodiment 1 that Fig. 2 provides for the utility model
Fig. 3 is the utility model existing range finder using laser Laser emission light path schematic diagram
Fig. 4 is the utility model existing range finder using laser laser pick-off light path schematic diagram
Fig. 5 is a kind of range finder using laser Laser emission light path schematic diagram in embodiment 2 provided by the invention
Fig. 6 is a kind of range finder using laser laser pick-off light path schematic diagram in embodiment 2 provided by the invention
Fig. 7 is a kind of range finder using laser Laser emission light path schematic diagram in embodiment 3 provided by the invention
Fig. 8 is a kind of range finder using laser laser pick-off light path schematic diagram in embodiment 3 provided by the invention
Embodiment
Embodiment of the present utility model is described below in detail.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
The transmitting light path of laser distance measuring system as shown in Figure 1, after laser instrument sends laser, first be divided into the orthogonal two-beam of polarization via polarization spectroscope 1, next, the polarization of this two-beam can be rotated 45 ° by Faraday rotator respectively, again through half-wave plate and mirror, this two-beam is made to obtain the polarization vertical with original state.Therefore, the light that originally can penetrate polarizing beam splitter 1 is reflected when leaving polarizing beam splitter 2, and the light being originally polarized optical splitter 1 reflection can penetrate when leaving polarizing beam splitter 2, finally, this two-beam overlaps at polarizing beam splitter 2 place, sends from laser distance measuring system through colimated light system.
The receiving light path of laser distance measuring system as shown in Figure 2, the light of laser distance measuring system is reflected back into through measured object, first can be polarized optical splitter 2 and be divided into the orthogonal two-beam of polarization, next, this two-beam is respectively by the reflection of mirror, its polarization state is rotated 45 ° by half-wave plate again, then becomes initial polarization via Faraday rotator.Therefore, the light that originally can penetrate polarizing beam splitter 2 is still when leaving polarizing beam splitter 1 and penetrates, and the light that originally can be polarized optical splitter 2 reflection is still reflected when leaving polarizing beam splitter 1, finally, this two-beam overlaps at polarizing beam splitter 1 place, and delivers in detector.
Embodiment 2
The transmitting light path of laser distance measuring system as shown in Figure 5, after laser emitter sends laser, first be divided into the orthogonal two-beam of polarization via polarizing beam splitter 1, next, the polarization of this two-beam can be rotated 45 ° by Faraday rotator respectively, again through half-wave plate, this two-beam is made to obtain the polarization vertical with original state, wherein, the light that originally can penetrate polarizing beam splitter 1 is reflected when leaving polarizing beam splitter 2, and be originally polarized light that optical splitter 1 reflects through Faraday rotator, can penetrate when leaving polarizing beam splitter 2 after the reflection of half-wave plate and two mirrors again, finally, this two-beam overlaps at polarizing beam splitter 2 place, send from laser distance measuring system through colimated light system.
The receiving light path of laser distance measuring system as shown in Figure 6, the light of laser distance measuring system is reflected back into through measured object, first can be polarized optical splitter 2 and be divided into the orthogonal two-beam of polarization, the laser being wherein polarized optical splitter 2 reflection is first rotated 45 ° by half-wave plate, initial polarization is become again via Faraday rotator, be polarized laser that optical splitter 2 reflects by the reflection of two mirrors, then rotate 45 ° via half-wave plate and Faraday rotator becomes initial polarization.Therefore, the light that originally can penetrate polarizing beam splitter 2 is still when leaving polarizing beam splitter 1 and penetrates, and the light that originally can be polarized optical splitter 2 reflection is still reflected when leaving polarizing beam splitter 1, finally, this two-beam overlaps at polarizing beam splitter 1 place, and delivers in detector.
Embodiment 3
The transmitting light path of laser distance measuring system as shown in Figure 7, after laser emitter sends laser, first be divided into the orthogonal two-beam of polarization via polarizing beam splitter 1, next, the polarization of this two-beam can be rotated 45 ° by Faraday rotator respectively, again through half-wave plate, this two-beam is made to obtain the polarization vertical with original state, wherein, the light that originally can be polarized the light that optical splitter 1 reflects is penetrated when leaving polarizing beam splitter 2, and originally penetrate polarizing beam splitter 1 through Faraday rotator, can reflect when leaving polarizing beam splitter 2 after the reflection of half-wave plate and two mirrors again, finally, this two-beam overlaps at polarizing beam splitter 2 place, send from laser distance measuring system through colimated light system.
The receiving light path of laser distance measuring system as shown in Figure 8, the light of laser distance measuring system is reflected back into through measured object, first can be polarized optical splitter 2 and be divided into the orthogonal two-beam of polarization, the laser being wherein polarized optical splitter 2 refraction is first rotated 45 ° by half-wave plate, initial polarization is become again via Faraday rotator, be polarized laser that optical splitter 2 reflects by the reflection of two mirrors, then rotate 45 ° via half-wave plate and Faraday rotator becomes initial polarization.Therefore, the light that originally can be polarized optical splitter 2 reflection is still reflection when leaving polarizing beam splitter 1, and the light originally penetrating polarizing beam splitter 2 is still penetrated when leaving polarizing beam splitter 1, finally, this two-beam overlaps at polarizing beam splitter 1 place, and delivers in detector.
Claims (3)
1. a pulse laser range finder light path system, comprises generating laser, and laser detecting device and colimated light system, is characterized in that, also comprises
Polarizing beam splitter 1, described generating laser is placed in the side of polarizing beam splitter 1, and described laser detecting device is placed in the opposite side of polarizing beam splitter 1;
Faraday rotator, half-wave plate and mirror is placed with separately respectively, the coaxial placement of polarizing beam splitter 1, Faraday rotator, half-wave plate and mirror in the transmitted light side of polarizing beam splitter 1 and reflected light side; Laser emission light path, the laser that laser emitter is launched passes through the transmittance and reflectance of polarizing beam splitter 1, be divided into two bundle laser, described two bundle laser are respectively successively by Faraday rotator, half-wave plate, again by the reflection of mirror, inject polarizing beam splitter 2, by the transmittance and reflectance of polarizing beam splitter 2, pool beam of laser, pass through colimated light system;
Laser pick-off light path, after the laser of measured object reflection passes through colimated light system, again by the transmittance and reflectance of polarizing beam splitter 2, be divided into two bundle laser, described two bundle laser respectively by mirror reflection, more successively by half-wave plate and Faraday rotator, inject polarizing beam splitter 1, by the transmittance and reflectance of polarizing beam splitter 1, pool beam of laser, get back to laser detecting device;
Laser emission light path and laser pick-off light path light path altogether.
2. range finder using laser light path system according to claim 1, is characterized in that, in Laser emission light path, laser is 45 degree by the laser after half-wave plate by the Faraday rotator anglec of rotation.
3. range finder using laser light path system according to claim 1, is characterized in that, in laser pick-off light path, laser is 45 degree by the laser after Faraday rotator by the half-wave plate anglec of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520371351.3U CN204740345U (en) | 2015-06-02 | 2015-06-02 | Pulsed laser range finder optic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520371351.3U CN204740345U (en) | 2015-06-02 | 2015-06-02 | Pulsed laser range finder optic system |
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| CN204740345U true CN204740345U (en) | 2015-11-04 |
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| CN201520371351.3U Active CN204740345U (en) | 2015-06-02 | 2015-06-02 | Pulsed laser range finder optic system |
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| CN (1) | CN204740345U (en) |
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- 2015-06-02 CN CN201520371351.3U patent/CN204740345U/en active Active
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