CN203732803U - Inner and outer optical path switching system for laser rangefinder - Google Patents
Inner and outer optical path switching system for laser rangefinder Download PDFInfo
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- CN203732803U CN203732803U CN201420143325.0U CN201420143325U CN203732803U CN 203732803 U CN203732803 U CN 203732803U CN 201420143325 U CN201420143325 U CN 201420143325U CN 203732803 U CN203732803 U CN 203732803U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
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Abstract
The utility model discloses an inner and outer optical path switching system for a laser rangefinder, and is used for realizing switch of the laser rangefinder in two working conditions of an inner optical path and an outer optical path. The inner and outer optical path switching system comprises a laser source, a half transmitting half-reflecting mirror, a reflecting mirror, a shading plate, a motor and a motor-driven circuit, wherein the shading plate is fixed on a rotating shaft of the motor, and is driven by the motor to select to be at a first light-proof position or a second light-proof position; laser sent by the laser source is divided into two light waves of range finding light and interior referencing light by the half-transmitting half-reflecting mirror; the range finding light penetrates through the half-transmitting half-reflecting mirror and forms the outer optical path; the interior referencing light is reflected by the reflecting mirror and form the inner optical path. The inner and outer optical path switching system improves isolation between the inner optical path and the outer optical path, improves accuracy in measurement of the laser rangefinder, enables error in measurement to the minimum, and is simple in structure and easy to realize.
Description
Technical field
The utility model relates to laser measuring technique field, relates in particular to the inside and outside light path switched system of laser range finder.
Background technology
Laser range finder is to utilize laser target range to be carried out to the instrument of Accurate Determining, it is generally by laser generator, collimator objective, receiving objective and photoelectric detector composition, wherein collimator objective is transformed into the measuring beam of a branch of collimation and blazes abroad for the laser that laser generator is sent, receiving objective is for receiving the reflection measurement light beam the focal imaging that reflect from testee, photoelectric detector is used for receiving the imaging of reflection measurement light beam and light signal being converted to corresponding electric signal, and obtains by this electric signal the result of finding range.
For improving the degree of accuracy of laser range finder, in the photoelectric detector of laser range finder, be also provided with inside and outside light path switched system, the switching of the inside and outside light path of existing laser range finder is mainly by the evolution of optical filter, realize between interior light path and outer light path and switching, so adopt optical filter to carry out inside and outside light path and switch the following problem that exists: the first, in the time entering outer light path duty, Laser emission is through optical filter, make Emission Lasers impaired, the light signal of receiving end is just more weak; The second, in the time entering interior light path duty, still some laser is launched through optical filter, and what receive in photoelectricity acceptance division branch arrives, and this has just disturbed the work of interior light path; The 3rd, due to the existence of the first two reason, make distance accuracy variation, it is large that measuring error becomes.
Meanwhile, in prior art, often adopt multiple laser generators to produce respectively the internal reference light that range finding light that external circuit uses and interior circuit are used, so just can increase the structural complexity of inside and outside light path switched system.
Therefore, need a kind of inside and outside light path switched system of improved laser range finder, to solve existing inside and outside light path switched system existing above-mentioned deficiency in application.
Utility model content
The purpose of this utility model, is to solve existing laser range finder distance accuracy poor, and measuring error is large, and between inside and outside light path, isolation is not high, the deficiencies such as complex structure, thus a kind of inside and outside light path switched system of improved laser range finder is provided.
For realizing described object, the inside and outside light path switched system of the laser range finder that the utility model provides, comprise lasing light emitter, half-transmitting and half-reflecting mirror, catoptron, shadow shield, motor and motor-drive circuit, described shadow shield is fixed on motor rotation axis, described motor-drive circuit drive motor drives shadow shield to select to be positioned at the first shading position or the second shading position, the laser that described lasing light emitter sends is divided into range finding light and internal reference light two-way light through half-transmitting and half-reflecting mirror, described range finding light transmission half-transmitting and half-reflecting mirror forms outer light path, light path in described internal reference light forms after catoptron reflection.
Preferably, described inside and outside light path switched system also comprises the photoelectric receiving arrangement being arranged between outer light path and interior light path, and described photoelectric receiving arrangement receives described range finding light and internal reference light.
Described inside and outside light path switched system also comprises the micro-control unit being connected with described motor-drive circuit, described micro-control unit transmits control signal to motor-drive circuit, motor drive motor rotation axis is rotated according to the instruction of control signal output, described shadow shield switches between the first shading position and the second shading position along with motor rotation axis rotation, thereby has realized the switching of system in inside and outside light path duty.
Angle between described the first shading position and the second shading position is 180 °, and when shadow shield is during in the first shading position, described laser range finder switches to interior optical path states; When shadow shield is during in the second shading position, described laser range finder switches to outer optical path states.
Described half-transmitting and half-reflecting mirror is in the outer light path between the first shading position and lasing light emitter; Described catoptron is in the interior light path between half-transmitting and half-reflecting mirror and the second shading position, and described half-transmitting and half-reflecting mirror and catoptron coordinate in outside light path and interior light path input corresponding range finding light and internal reference light respectively.
Described photoelectric receiving arrangement can adopt photodiode, phototriode, avalanche diode or photomultiplier.
Compared with prior art, the beneficial effect of the inside and outside light path switched system of the utility model laser range finder is: (1) the utility model adopts half-transmitting and half-reflecting mirror and catoptron to coordinate and produces the inside and outside required light signal of light path, make simplifying the structure and being easy to realization of system, simultaneously these two kinds of catoptrons do not weaken the intensity of corresponding light signal yet, improved stadimeter measuring accuracy, reduced measuring error; (2) the utility model adopts complete lighttight shadow shield to carry out the switching of inside and outside light path, has improved the isolation between inside and outside light path, has further ensured the measuring accuracy of stadimeter and measuring error is minimized; (3) the utility model adopts controller to add the switching of the inside and outside light path of Electric Machine Control, and system can be switched flexibly under two kinds of duties of inside and outside light path.
Brief description of the drawings
Fig. 1 is the structural representation of the inside and outside light path switched system of the utility model laser range finder.
Reference numeral: 1, lasing light emitter, 2, half-transmitting and half-reflecting mirror, 3, catoptron, 4, shadow shield, 5, motor rotation axis, 6, motor, 7, motor-drive circuit, 8, micro-control unit, 9, photoelectric receiving arrangement.
Embodiment
Below in conjunction with the drawings and specific embodiments, the structure composition of the inside and outside light path switched system to laser range finder of the present utility model is elaborated.
The utility model provides a kind of inside and outside light path switched system of laser range finder, be used for realizing laser range finder interior, the switching of two kinds of duties of outer light path, it comprises lasing light emitter 1, half-transmitting and half-reflecting mirror 2, catoptron 3, shadow shield 4, motor 6, motor-drive circuit 7 and photoelectric receiving arrangement 9, described lasing light emitter 1 is for generation of the laser of range finding use, described half-transmitting and half-reflecting mirror 2 has transmission and reflection function simultaneously, laser is divided into two-way light after half-transmitting and half-reflecting mirror 2, respectively the range finding light of range finding use and the internal reference light of using in order to improve distance accuracy, wherein said range finding light enters into outer light path after 2 transmissions of half-transmitting and half-reflecting mirror, described internal reference light enters interior light path through catoptron 3 reflections.
Described catoptron 3 is for receiving the internal reference light being reflected back by half-transmitting and half-reflecting mirror 2, and the internal reference light that reception is come is sent in interior light path again.The utility model adopts half-transmitting and half-reflecting mirror 2 to coordinate outside light path and interior light path to input respectively range finding light and internal reference light with catoptron 3, compared with producing respectively corresponding light path with two lasing light emitters of prior art employing, its structure is simplified more, and implements also more convenient.
Described shadow shield 4 is for realizing switching and the high degree of isolation of outer light path and interior light path, described shadow shield 4 is fixed on motor rotation axis 5, along with the rotation of motor rotation axis 5 is switched respectively between the first shading position A and the second shading position B, particularly, in the time that shadow shield 4 rotates to the second B place, shading position, range finding light is because of without hindrance thing in light path outside, directly send to photoelectric receiving arrangement 9 to receive, correspondingly, internal reference light is because of the existence of shadow shield 4, and cannot in interior light path, transmit, shadow shield 4 now can ensure can only receive this road light of range finding light on photoelectric receiving arrangement 9, in like manner, in the time that shadow shield 4 rotates to the first A place, shading position, outer light path is just blocked, internal reference light enters into interior light path after catoptron 3 transmittings, and received by photoelectric receiving arrangement 9, compared with existing optical filter, described shadow shield 4 in the utility model is for completely lighttight, therefore under interior light path duty, the phenomenon that there will not be part range finding light transmission shadow shield 4 to be received by photoelectric receiving arrangement 9 completely, now can only receive this road light of internal reference light on photoelectric receiving arrangement 9.So the inside and outside light path that is arranged so that of the utility model shadow shield 4 does not affect at mutual when working, there is higher isolation between the two, thereby improved the distance accuracy of laser range finder and reduced measuring error.
Shadow shield 4 in the utility model adopts motor drive mode to drive, be that described shadow shield 4 is connected with motor 6 through motor rotation axis 5, drive it to block position A and second first by motor 6 and block between the B of position and switch, in the present embodiment, first blocks position A and second and blocks between the B of position and arrange and be 180 °.
In order further to improve dirigibility and the automaticity of shadow shield 4 handoff procedures, the utility model can adopt controller to control motor 6, adopt in the present embodiment micro-control unit 8 to be connected with motor-drive circuit 7, thereby in controlling, the switching of outer light path, particularly, micro-control unit 8 transmits control signal to motor-drive circuit 7, this control signal control motor-drive circuit 7, make motor 6 carry out corresponding rotation according to order-driven motor rotation axis 5, fixing 4 rotations along with motor rotation axis 5 of shadow shield on motor rotation axis 5 and turn to corresponding shading position, thereby the light path of controlling laser range finder is operated in interior optical path states or outer optical path states.
Described photoelectric receiving arrangement 9 is arranged between outer light path and interior light path, for receiving the range finding light being sended over by outer light path, and the internal reference light being sended over by interior light path, carry out again afterwards the phase bit comparison of two-way light, draw both phase differential, thereby calculate the measured respective distance of laser range finder.Described photoelectric receiving arrangement can adopt photodiode, phototriode, avalanche diode or photomultiplier.
Certainly, be more than embodiment of the present utility model, should be understood that; for those skilled in the art; not departing under the prerequisite of the utility model ultimate principle, can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (7)
1. the inside and outside light path switched system of laser range finder, it is characterized in that: comprise lasing light emitter, half-transmitting and half-reflecting mirror, catoptron, shadow shield, motor and motor-drive circuit, described shadow shield is fixed on motor rotation axis, described motor-drive circuit drive motor drives shadow shield to select to be positioned at the first shading position or the second shading position, the laser that described lasing light emitter sends is divided into range finding light and internal reference light two-way light wave through half-transmitting and half-reflecting mirror, described range finding light transmission half-transmitting and half-reflecting mirror forms outer light path, light path in described internal reference light forms after catoptron reflection.
2. the inside and outside light path switched system of laser range finder according to claim 1, it is characterized in that, described inside and outside light path switched system also comprises the photoelectric receiving arrangement being arranged between outer light path and interior light path, and described photoelectric receiving arrangement receives described range finding light and internal reference light.
3. the inside and outside light path switched system of laser range finder according to claim 1, it is characterized in that, described inside and outside light path switched system also comprises the micro-control unit being connected with described motor-drive circuit, described micro-control unit transmits control signal to motor-drive circuit, controls shadow shield in the first shading position or the second shading position.
4. the inside and outside light path switched system of laser range finder according to claim 1, it is characterized in that, angle between described the first shading position and the second shading position is 180 °, and when shadow shield is during in the first shading position, described laser range finder switches to interior optical path states; When shadow shield is during in the second shading position, described laser range finder switches to outer optical path states.
5. the inside and outside light path switched system of laser range finder according to claim 1, is characterized in that, described half-transmitting and half-reflecting mirror is in the outer light path between the first shading position and lasing light emitter.
6. the inside and outside light path switched system of laser range finder according to claim 5, is characterized in that, described catoptron is in the interior light path between half-transmitting and half-reflecting mirror and the second shading position.
7. the inside and outside light path switched system of laser range finder according to claim 2, is characterized in that, described photoelectric receiving arrangement is photodiode, phototriode, avalanche diode or photomultiplier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420143325.0U CN203732803U (en) | 2014-03-27 | 2014-03-27 | Inner and outer optical path switching system for laser rangefinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420143325.0U CN203732803U (en) | 2014-03-27 | 2014-03-27 | Inner and outer optical path switching system for laser rangefinder |
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| Publication Number | Publication Date |
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| CN203732803U true CN203732803U (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420143325.0U Expired - Lifetime CN203732803U (en) | 2014-03-27 | 2014-03-27 | Inner and outer optical path switching system for laser rangefinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702825A (en) * | 2019-09-25 | 2020-01-17 | 安徽皖仪科技股份有限公司 | Device and method for reducing noise and drift of multi-channel detector |
-
2014
- 2014-03-27 CN CN201420143325.0U patent/CN203732803U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702825A (en) * | 2019-09-25 | 2020-01-17 | 安徽皖仪科技股份有限公司 | Device and method for reducing noise and drift of multi-channel detector |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20140723 |