CN114740218A - Method for measuring speed by laser - Google Patents
Method for measuring speed by laser Download PDFInfo
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- CN114740218A CN114740218A CN202210408000.XA CN202210408000A CN114740218A CN 114740218 A CN114740218 A CN 114740218A CN 202210408000 A CN202210408000 A CN 202210408000A CN 114740218 A CN114740218 A CN 114740218A
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- regular polyhedron
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
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Abstract
The invention provides a method for measuring speed by laser, which enables the rotation speed of a regular polyhedron reflector to be low in measurement cost and facilitates engineering operation. The device is used for measuring the rotating speed of the regular polyhedron reflecting mirror, and is characterized in that: the laser is arranged towards the reflecting surface of the regular polyhedron reflector, a lens is arranged behind the reflecting surface reflecting the output light beam of the laser, the lens is used for collimating and outputting the reflected light beam output to the rear, at least three detectors are sequentially arranged on the lens in the arrangement direction corresponding to the collimated light beam, all the detectors are arranged from top to bottom along the plane corresponding to the collimated light beam, each detector automatically times after detecting bright spots, the timing time corresponding to the detector is fed back to an external data processing module, and the clockwise rotation or anticlockwise rotation state of the regular polyhedron reflector is accurately obtained according to the time sequence of receiving the bright spots of each reflecting surface rotation type detector by the output light beam.
Description
Technical Field
The invention relates to the technical field of laser speed measurement, in particular to a method for measuring speed by laser.
Background
When the regular polyhedron reflector rotates, the rotating speed of the regular polyhedron reflector needs to be accurately obtained, the conventional measuring method needs to carry out measurement for many times through a complex precision instrument, the measuring process is complex, the measuring cost is high, and therefore a speed measuring method which is low in cost and convenient for engineering operation is urgently needed.
Disclosure of Invention
In view of the above problems, the present invention provides a method for measuring a speed by laser, which enables a rotation speed of a regular polygon mirror to be measured at a low cost and facilitates engineering work.
A method for measuring speed by laser, which is used for measuring the rotation speed of a regular polyhedron reflector, characterized in that: arranging a laser towards the reflecting surface of the regular polyhedron reflector, arranging a lens behind the reflecting surface reflecting the output light beam of the laser, wherein the lens is used for collimating and outputting the reflected and then outputted light beam, at least three detectors are sequentially arranged on the lens in the arrangement direction corresponding to the collimated light beam, all the detectors are arranged from top to bottom along the plane corresponding to the collimated light beam, each detector automatically times after detecting bright spots, the timing time corresponding to the detector is fed back to an external data processing module, the clockwise rotation or anticlockwise rotation state of the regular polyhedron reflector is accurately obtained according to the sequential time of receiving the bright spots of each reflecting surface rotary detector by the output light beam, then the time difference of the bright spots is obtained firstly and secondly by the same detector, and the angle value corresponding to each reflecting surface of the regular polyhedron reflector is combined, and calculating to obtain the angular velocity value of the regular polyhedron reflector.
It is further characterized in that:
the number of the detectors is three, the three detectors are specifically a first detector, a second detector and a third detector, the second detector is horizontally arranged at the rear position of the central axis of the lens, the first detector is arranged at the upper position of the second detector, the third detector is arranged at the lower position of the second detector, and the three detectors can accurately measure the rotation direction and the rotation speed of the regular polyhedron reflector with the least cost;
the laser emergent light beam is a parallel light beam z, and is reflected by a rotating regular polyhedron reflector, when the regular polyhedron reflector rotates to different positions, reflected light beams are a light beam a, a light beam b and a light beam c respectively, the light beam a is collimated into a parallel light beam by a lens and is incident to a first detector, and the light beam b is transmitted through the center of the lens and is incident to a second detector; the light beam c is collimated into a parallel light beam by a lens and enters a third detector; the light beam a is incident to the first detector, the light beam b is incident to the second detector, the light beam c is incident to the third detector, the light and dark frequencies of light spots are detected through the first detector, the second detector and the third detector, corresponding time is recorded, the rotating speed of the regular polyhedron reflector is calculated, and laser speed measurement is achieved.
After the method is adopted, the emergent light beam of the laser is reflected to a lens behind through the reflecting surface corresponding to the rotating regular polyhedron reflector, the lens collimates the light beam and outputs the light beam, a plurality of detectors are arranged behind the lens, each detector only detects the punctual light beam at the corresponding position, all the detectors are arranged from top to bottom along the plane corresponding to the collimated light beam, the sequence of bright spots detected by the detectors is that the regular polyhedron reflector rotates anticlockwise when the regular polyhedron reflector is lightened from bottom to top in each period, and the regular polyhedron reflector rotates clockwise when the regular polyhedron reflector is lightened from top to bottom in each period, then the time difference of the bright spots is obtained through the same detector, and the angular velocity value of the regular polyhedron reflector is obtained through calculation by combining the angular value corresponding to each reflecting surface of the regular polyhedron reflector; the real-time rotating direction and the rotating angular speed of the regular polyhedron reflector can be accurately and quickly obtained only by the laser, the lens, the at least three detectors and the external data processing module, so that the rotating speed of the regular polyhedron reflector is low in measuring cost and convenient for engineering operation.
Drawings
FIG. 1 is a simplified optical schematic of an embodiment of the present invention;
the names corresponding to the sequence numbers in the figure are as follows:
the detector comprises a laser 1, a regular polyhedron reflector 2, a lens 3, a first detector 4, a second detector 5 and a third detector 6.
Detailed Description
A method of measuring speed by laser for measuring the rotation speed of a regular polygon mirror, see fig. 1: arranging a laser 1 towards the reflecting surface of a regular polyhedron reflector 2, arranging a lens 3 behind the reflecting surface for reflecting the output light beam of the laser, wherein the lens 3 is used for collimating and outputting the reflected light beam which is output to the rear, arranging at least three detectors in sequence in the arrangement direction of the lens 3 corresponding to the collimated light beam, all the detectors are arranged from top to bottom along the plane corresponding to the collimated light beam, each detector automatically times after detecting bright spots and feeds back the time corresponding to the detector to an external data processing module, accurately obtaining the clockwise rotation or anticlockwise rotation state of the regular polyhedron reflector 2 according to the time sequence of receiving the bright spots of each reflecting surface rotary detector by the output light beam, then obtaining the time difference of the bright spots through the same detector, and combining the angle value corresponding to each reflecting surface of the regular polyhedron reflector, and calculating to obtain the angular velocity value of the regular polyhedron reflector.
In specific implementation, the number of the detectors is three, the three detectors are specifically a first detector 4, a second detector 5 and a third detector 6, the second detector 5 is horizontally arranged at the rear position of the central shaft of the lens 6, the first detector 4 is arranged at the upper position of the second detector 5, the third detector 6 is arranged at the lower position of the second detector 5, and the three detectors enable the rotation direction and the rotation speed of the regular polyhedron reflector 2 to be accurately measured with minimum cost;
the emergent light beam of the laser 1 is a parallel light beam z, and is reflected by the rotating regular polygon mirror 2, when the regular polygon mirror 2 rotates to different positions, the reflected light beams are a light beam a, a light beam b and a light beam c respectively, the light beam a is collimated into a parallel light beam by the lens and is incident to the first detector 4, and the light beam b is transmitted through the center of the lens and is incident to the second detector 5; the light beam c is collimated into a parallel light beam by a lens and enters the third detector 6; the light beam a is incident to the first detector 4, the light beam b is incident to the second detector 5, the light beam c is incident to the third detector 6, the light spot brightness and darkness frequencies are detected through the first detector 4, the second detector 5 and the third detector 6, corresponding time is recorded, the rotation speed of the regular polyhedron reflector is calculated, and laser speed measurement is achieved.
In the specific implementation: the wavelength of the laser 1 is 532 nm; the light beam emitted by the laser 1 is a parallel light beam, and the diameter of the light beam is phi 2 mm; the regular polyhedron reflector 2 is a regular hexahedron; the first detector 4, the second detector 5 and the third detector 6 are all APD photodetectors, the regular polyhedron reflector 2 rotates around the center O thereof, and the angle value corresponding to each reflecting surface of the regular polyhedron reflector 2 is 60 degrees.
The working principle is as follows: the laser device comprises a laser device, a rotating regular polyhedron reflector, a lens, a plurality of detectors and a plurality of detectors, wherein the laser device emits light beams, the laser device emits the light beams, the light beams are reflected to the rear lens through a reflecting surface corresponding to the rotating regular polyhedron reflector, the lens collimates the light beams and outputs the light beams, the detectors are arranged behind the lens, each detector only detects punctual light beams at corresponding positions, all the detectors are arranged from top to bottom along a plane corresponding to the collimated light beams, the sequence of bright spots detected by the detectors is that the regular polyhedron reflector rotates anticlockwise when the regular polyhedron reflector is lightened from bottom to top in each period, the regular polyhedron reflector rotates clockwise when the regular polyhedron reflector is lightened from top to bottom in each period, and then the time difference of the bright spots is obtained through the same detector first and the second, and the angular velocity value of the regular polyhedron reflector is obtained by combining the corresponding angular value of each reflecting surface of the regular polyhedron reflector; the real-time rotating direction and the rotating angular speed of the regular polyhedron reflecting mirror can be accurately and quickly obtained only by the laser, the lens, the at least three detectors and the external data processing module, so that the rotating speed of the whole polyhedron reflecting mirror is low in measuring cost and convenient for engineering operation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A method for measuring speed by laser, which is used for measuring the rotation speed of a regular polyhedron reflector, characterized in that: arranging a laser towards the reflecting surface of the regular polyhedron reflector, arranging a lens behind the reflecting surface reflecting the output light beam of the laser, wherein the lens is used for collimating and outputting the reflected and then outputted light beam, at least three detectors are sequentially arranged on the lens in the arrangement direction corresponding to the collimated light beam, all the detectors are arranged from top to bottom along the plane corresponding to the collimated light beam, each detector automatically times after detecting bright spots, the timing time corresponding to the detector is fed back to an external data processing module, the clockwise rotation or anticlockwise rotation state of the regular polyhedron reflector is accurately obtained according to the sequential time of receiving the bright spots of each reflecting surface rotary detector by the output light beam, then the time difference of the bright spots is obtained firstly and secondly by the same detector, and the angle value corresponding to each reflecting surface of the regular polyhedron reflector is combined, and calculating to obtain the angular velocity value of the regular polyhedron reflector.
2. A method of measuring velocity by laser as claimed in claim 1, wherein: the number of the detectors is three, the three detectors are specifically a first detector, a second detector and a third detector, the second detector is horizontally arranged at the rear position of the central axis of the lens, the first detector is arranged at the upper position of the second detector, the third detector is arranged at the lower position of the second detector, and the three detectors enable the rotation direction and the rotation speed of the regular polyhedron reflector to be accurately measured with the least cost.
3. A method of measuring velocity by laser as claimed in claim 2, wherein: the laser emergent light beam is a parallel light beam z, and is reflected by a rotating regular polyhedron reflector, when the regular polyhedron reflector rotates to different positions, reflected light beams are a light beam a, a light beam b and a light beam c respectively, the light beam a is collimated into a parallel light beam by a lens and is incident to a first detector, and the light beam b is transmitted through the center of the lens and is incident to a second detector; the light beam c is collimated into a parallel light beam by a lens and enters a third detector; the light beam a is incident to the first detector, the light beam b is incident to the second detector, the light beam c is incident to the third detector, the light and dark frequencies of light spots are detected through the first detector, the second detector and the third detector, corresponding time is recorded, the rotating speed of the regular polyhedron reflector is calculated, and laser speed measurement is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210408000.XA CN114740218A (en) | 2022-04-19 | 2022-04-19 | Method for measuring speed by laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210408000.XA CN114740218A (en) | 2022-04-19 | 2022-04-19 | Method for measuring speed by laser |
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| CN114740218A true CN114740218A (en) | 2022-07-12 |
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| CN202210408000.XA Pending CN114740218A (en) | 2022-04-19 | 2022-04-19 | Method for measuring speed by laser |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970510A (en) * | 2016-01-14 | 2017-07-21 | 株式会社东芝 | Image processing system and control device |
| CN112833823A (en) * | 2021-02-23 | 2021-05-25 | 北方民族大学 | Novel sensor based on time angle measurement and angle measurement method thereof |
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2022
- 2022-04-19 CN CN202210408000.XA patent/CN114740218A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970510A (en) * | 2016-01-14 | 2017-07-21 | 株式会社东芝 | Image processing system and control device |
| CN112833823A (en) * | 2021-02-23 | 2021-05-25 | 北方民族大学 | Novel sensor based on time angle measurement and angle measurement method thereof |
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