CN216718698U - Low-cost green light phase range finder - Google Patents
Low-cost green light phase range finder Download PDFInfo
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- CN216718698U CN216718698U CN202123267958.1U CN202123267958U CN216718698U CN 216718698 U CN216718698 U CN 216718698U CN 202123267958 U CN202123267958 U CN 202123267958U CN 216718698 U CN216718698 U CN 216718698U
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Abstract
The utility model discloses a low-cost green light phase range finder, which comprises an optical machine body: the optical machine is characterized in that a green laser diode and a red laser diode are respectively arranged in the optical machine body, an internal reflecting surface is arranged on the inner wall of the optical machine body and reflects the red laser diode to the photosensitive device, and a receiving lens is arranged at the opening end of the optical machine body. According to the range finder, through the structural design of the green laser diode, the red laser diode and the photosensitive device, the range finder can be used for efficiently and accurately finding the range, the manufacturing cost of the range finder is reduced, errors caused by temperature changes can be eliminated, the temperature drift phenomenon is prevented, the measurement errors are reduced, and the measurement precision is improved.
Description
Technical Field
The utility model relates to the technical field of laser ranging, in particular to a low-cost green light phase range finder.
Background
The green light phase laser distance meter indirectly measures the flight time of light between the round trip in the air and the target to be measured by measuring the phase delay generated by the round trip distance of continuous modulated light waves, thereby calculating the measured distance, and the realization method comprises the following steps: the high-frequency signal f1 is modulated on a semiconductor green laser tube, so that light and dark laser with continuous high-frequency change is generated on the green laser tube, the high-frequency signal f2 is modulated on a photodiode, the photodiode receives the laser reflected by a detected target, then the laser is subjected to frequency mixing filtering by the photodiode to obtain low-frequency signals f1-f2, and the phase of the low-frequency signals (f1-f2) is calculated, so that the detected distance is calculated.
Chinese patent publication No.: CN205941903U discloses a distance measuring device, which includes a light machine body, a light sensitive device, a first light source as an external reference and a second light source as an internal reference, wherein the first light source is a laser emitting tube, the second light source is a light emitting diode, the laser emitting tube emits laser to a point to be measured, the laser is reflected back to the light sensitive device through the point to be measured, the light emitting diode irradiates in the light machine body and makes the light sensitive device receive light, so as to correct the error of the light sensitive device caused by temperature.
The existing green laser diode has certain phase delay to signals modulated on the laser diode, and the phase delay is different at different temperatures, so that the laser range finder has errors in ranging results at different temperatures, and meanwhile, the manufacturing cost of the phase range finder is also higher, and the laser range finder is not beneficial to popularization and use in a large range.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-cost green light phase distance meter which is low in cost, avoids the temperature drift phenomenon and improves the distance measurement precision.
In order to achieve the above purpose, the utility model provides the following technical scheme: a low-cost green glow phase distance meter, includes the ray apparatus body:
a green laser diode and a red laser diode are respectively arranged in the optical machine body;
the inner wall of the optical machine body is provided with an internal reflecting surface, and the internal reflecting surface reflects the red light laser diode onto the photosensitive device;
the open end of the optical machine body is provided with a receiving lens.
As a further description of the above technical solution:
the green laser diode emits a laser beam a and irradiates a target to be measured.
As a further description of the above technical solution:
the red laser diode emits a laser beam b and irradiates an internal reflection surface.
As a further description of the above technical solution:
the photosensitive device is an avalanche photodiode.
As a further description of the above technical solution:
the phase distance meter also comprises an IV conversion circuit, an amplifying circuit and a single chip microcomputer, wherein the output end of the photosensitive device after frequency mixing is connected with the single chip microcomputer through the IV conversion circuit and the amplifying circuit.
As a further description of the above technical solution:
the phase distance meter further comprises a signal generator DDS which generates a frequency f1 and a frequency f2, wherein the frequency f1 is modulated on the green laser diode and the red laser diode, and the frequency f2 is modulated on the photosensitive device.
In the technical scheme, the low-cost green light phase distance meter provided by the utility model has the following beneficial effects:
this distancer should be through the structural design who uses a green glow laser diode, a ruddiness laser diode and a photosensitive element, when guaranteeing the high-efficient accurate range finding of distancer, has also reduced the manufacturing cost of distancer to can eliminate the error that temperature variation brought, prevent the phenomenon that the temperature floats, reduce measuring error, improve measuring precision.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a low-cost green light phase distance meter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a low-cost green light phase distance meter according to an embodiment of the present invention.
Description of reference numerals:
1. a green laser diode; 2. a red light laser diode; 3. a photosensitive device; 4. an internal reflective surface; 5. a carriage body; 6. a receiving lens; 7. a laser beam b; 8. a laser beam a.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, a low-cost green light phase distance meter includes an optical machine body 5:
a green laser diode 1 and a red laser diode 2 are respectively arranged in the optical machine body 5;
an inner reflecting surface 4 is arranged on the inner wall of the optical machine body 5, and the red light laser diode 2 is reflected to the photosensitive device 3 by the inner reflecting surface 4;
the open end of the optical machine body 5 is provided with a receiving lens 6.
The green laser diode 1 emits a laser beam a8 and irradiates the object to be measured.
The red laser diode 2 emits a laser beam b7 and irradiates the internal reflection surface 4.
The light sensing device 3 is an avalanche photodiode for converting a received light signal into a current signal.
The phase distance meter also comprises an IV conversion circuit, an amplifying circuit and a single chip microcomputer, and the output end of the photosensitive device 3 after frequency mixing is connected with the single chip microcomputer through the IV conversion circuit and the amplifying circuit.
The phase distance meter further comprises a signal generator DDS, the signal generator DDS generates frequency f1 and frequency f2, the frequency f1 is modulated on the green laser diode 1 and the red laser diode 2, the frequency f2 is modulated on the photosensitive device 3, the green laser diode 1 and the red laser diode 2 emit laser in turn, and frequency f1 of the two lasers is mixed on the photosensitive device 3 and frequency f2 respectively. The output end of the photosensitive device 3 after frequency mixing is electrically connected with the single chip microcomputer through the IV conversion circuit and the amplifying circuit, namely when the green laser diode 1 emits laser, the photosensitive device 3 receives the laser beam a8, then the laser beam a8 is processed through the IV conversion circuit and the amplifying circuit, and then the laser beam a is transmitted to the single chip microcomputer to be calculated to obtain a phase Ta, and the phase Ta represents the distance of a measured object.
When the red light laser diode 2 emits laser, the photosensitive device 3 receives the laser beam b7, then the laser beam b7 is processed by the IV conversion circuit and the amplifying circuit, the laser beam b7 is transmitted to the single chip microcomputer to be calculated to obtain a phase Tb, the phase Tb represents the distance from the laser beam b7 to the photosensitive device 3 after being reflected by the internal reflecting surface 4 of the optical machine body 5, and the phase Tb is a fixed value.
Since the gain factor of the photo-sensor 3 is temperature dependent, the gain factors of the photo-sensors 3 are different for different temperatures. The laser beam b7 is a beam with fixed intensity, and irradiates on the photosensitive device 3 through the internal reflection surface 4, when the environmental temperature changes, the gain multiple of the photosensitive device 3 changes, the output signal changes, and the single-chip microcomputer program can adjust the gain multiple of the photosensitive device 3 according to the signal size condition.
A distance measuring method of a low-cost green light phase distance meter comprises the following steps:
s01: the laser beam a8 is emitted by the green laser diode 1, is reflected by a measured target, is received by the photosensitive device 3 through the receiving lens 6, and then is processed by the IV conversion circuit, the amplifying circuit and the singlechip to calculate the phase Ta;
s02: the red laser diode 2 emits a laser beam b7, the laser beam b7 is reflected by the internal reflecting surface 4 and then is received by the photosensitive device 3, and then the phase Tb is calculated through the processing of the IV conversion circuit, the amplifying circuit and the singlechip;
s03: when the temperature changes, the phase information modulated to the green laser diode 1 and the red laser diode 2 changes t, at this time, Ta and Tb change correspondingly, and the changed information is represented by symbols Ta 'and Tb' respectively;
s04: ta' ═ Ta + t; tb' ═ Tb + t; the measured distance is D, Ta '-Tb', Ta-Tb. When measuring the same distance, D is always kept constant when the temperature changes.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the utility model.
Claims (6)
1. The utility model provides a low-cost green glow phase range finder, includes ray apparatus body (5), its characterized in that:
the light machine body (5) is internally provided with a green laser diode (1) and a red laser diode (2) respectively;
an inner reflecting surface (4) is arranged on the inner wall of the optical machine body (5), and the red light laser diode (2) is reflected to the photosensitive device (3) by the inner reflecting surface (4);
the opening end of the optical machine body (5) is provided with a receiving lens (6).
2. A low cost green light phase rangefinder as claimed in claim 1 wherein: the green laser diode (1) emits a laser beam a (8) and irradiates a target to be measured.
3. A low cost green phase range finder as claimed in claim 1 wherein: the red laser diode (2) emits a laser beam b (7) and irradiates the internal reflection surface (4).
4. A low cost green light phase rangefinder as claimed in claim 1 wherein: the photosensitive device (3) is an avalanche photodiode.
5. A low cost green phase range finder as claimed in claim 1 wherein: the phase distance meter further comprises an IV conversion circuit, an amplifying circuit and a single chip microcomputer, and the output end of the photosensitive device (3) after frequency mixing is connected with the single chip microcomputer through the IV conversion circuit and the amplifying circuit.
6. A low cost green phase range finder as claimed in claim 1 wherein: the phase distance meter further comprises a signal generator DDS, wherein the signal generator DDS generates a frequency f1 and a frequency f2, the frequency f1 is modulated on the green laser diode (1) and the red laser diode (2), and the frequency f2 is modulated on the photosensitive device (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123267958.1U CN216718698U (en) | 2021-12-23 | 2021-12-23 | Low-cost green light phase range finder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123267958.1U CN216718698U (en) | 2021-12-23 | 2021-12-23 | Low-cost green light phase range finder |
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| Publication Number | Publication Date |
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| CN216718698U true CN216718698U (en) | 2022-06-10 |
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| CN202123267958.1U Active CN216718698U (en) | 2021-12-23 | 2021-12-23 | Low-cost green light phase range finder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137559A (en) * | 2021-12-23 | 2022-03-04 | 杭州隆硕科技有限公司 | Low-cost green light phase range finder |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137559A (en) * | 2021-12-23 | 2022-03-04 | 杭州隆硕科技有限公司 | Low-cost green light phase range finder |
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