CN111562565A - Method for testing distance measurement power of pulse laser distance measuring machine - Google Patents
Method for testing distance measurement power of pulse laser distance measuring machine Download PDFInfo
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- CN111562565A CN111562565A CN202010478111.9A CN202010478111A CN111562565A CN 111562565 A CN111562565 A CN 111562565A CN 202010478111 A CN202010478111 A CN 202010478111A CN 111562565 A CN111562565 A CN 111562565A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
Abstract
The invention relates to a method for testing distance measurement power of a pulse laser distance measuring machine, which comprises the following steps that I, a white ball is hung at the bottom of the tail end of a cross rod through a lifting rope; placing the tester at a certain distance from the laser range finder to ensure that the white ball is positioned in the laser divergence angle of the laser range finder; increasing a attenuator group, aiming and measuring distance of the white ball through an aiming lens, and judging whether the echo rate meets the requirement or not according to the echo value; taking down the attenuation sheet with the minimum attenuation value in the attenuation sheet group until the critical stable ranging state is reached, then aiming and ranging the white ball, and judging whether the echo rate meets the requirement according to the return value of the laser range finder; and V, combining the atmospheric condition of the test site, the distance value of the white ball relative to the laser distance measuring machine and the maximum attenuation value of the attenuation sheet group, calculating the distance measuring distance of the laser distance measuring machine under the specific condition for the specific target.
Description
Technical Field
The invention relates to the technical field of performance testing of laser range finders, in particular to a method for testing the range finding power of a pulse laser range finder.
Background
When the laser distance measuring machine is used for acceptance test, the distance measuring power of the laser distance measuring machine is generally used as a key index.
The existing method for testing the power of the laser distance measuring machine mainly comprises an actual target testing method and an equivalent simulation testing method. The actual target test method is not frequently used because the distance measurement target is not easy to coordinate, the distance measurement length is long, and the distance is tens of kilometers away, and the field is not easy to coordinate. The most authoritative test method in the simulation test method is a military mapping test method, a calibrated large target surface target plate is used, and a laser range finder is tested at a calibrated position.
Therefore, in view of the above disadvantages, it is desirable to provide a method for testing the distance measurement capability of a pulsed laser distance measuring machine.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the power test of a laser range finder is easily limited by places.
(II) technical scheme
In order to solve the above technical problems, the present invention provides a method for testing distance measurement capability of a pulse laser distance measuring machine, comprising the following steps,
i, hanging a white ball at the bottom of the tail end of a cross rod through a lifting rope;
placing the tester at a certain distance from the laser range finder, wherein the tester comprises an upright rod, a cross rod, a lifting rope and a white ball, and ensuring that the white ball is positioned in a laser divergence angle of the laser range finder;
increasing a attenuator group, aiming and measuring distance of the white ball through an aiming lens, and judging whether the echo rate meets the requirement or not according to the echo value;
taking down the attenuation sheet with the minimum attenuation value in the attenuation sheet group until the critical stable ranging state is reached, then aiming and ranging the white ball, and judging whether the echo rate meets the requirement according to the return value of the laser range finder;
and V, calculating the laser scattering area of the white ball, and combining the atmospheric condition of the test site, the distance value of the white ball relative to the laser range finder and the maximum attenuation value of the attenuation sheet group to calculate the ranging distance of the laser range finder relative to the specific target to be ranged under the specific atmospheric condition.
By adopting the technical scheme, the problem that the angle between the target plate and the optical axis of the pulse laser distance measuring machine to be measured needs to be calibrated in advance and the distance measuring power of the pulse laser distance measuring machine is limited to be tested easily by a fixed field can be solved, and the distance measuring capability can be flexibly and conveniently tested.
As a further description of the present invention, it is preferable that the vertical rods are vertical in length direction, the cross rods are horizontal in length direction, one end of each cross rod is fixedly connected to the top ends of the vertical rods, the vertical rods are 2.5m to 5m in length, the cross rods are 1m to 2m in length, and the vertical rods are longer than the cross rods.
Through adopting above-mentioned technical scheme, pole setting and horizontal pole length are all longer to make pole setting and horizontal pole keep away from the white ball, avoid laser irradiation reflection signal influence to the range finding of white ball on pole setting or horizontal pole.
As a further explanation of the present invention, it is preferable that the vertical rods and the horizontal rods are telescopic sliding rods.
Through adopting above-mentioned technical scheme, make pole setting and horizontal pole adjustable length, and then enable pole setting and horizontal pole and can change according to the test requirement of actual difference to improve the suitability of pole setting and horizontal pole.
As a further explanation of the present invention, it is preferable that the planes of the vertical rod and the horizontal rod are perpendicular to the optical axis of the laser range finder.
By adopting the technical scheme, the phenomenon that the pulse laser irradiates the vertical rod and the transverse rod to cause signal mutual interference and influence the distance measuring machine on the judgment of the white ball reflection signal is avoided.
As a further description of the present invention, it is preferable that the outer diameter of the white ball is between 60 to 200mm, and the minimum distance between the white ball and the laser range finder is 500 m.
As a further description of the present invention, preferably, the laser range finder includes a machine body, a transmitting end, a receiving end and a sighting telescope, the transmitting end and the receiving end are both fixedly connected to the front end of the machine body, the sighting telescope is fixedly connected to one side of the machine body, and the center of the sighting telescope is coaxial with the center of a laser emission beam of the transmitting end.
By adopting the technical scheme, the sight of the sighting telescope can be coincided with the laser emission beam and fall on the same position of the white ball, so that the laser can accurately fall on the white ball, and the testing accuracy is further ensured.
As a further description of the present invention, preferably, the attenuation sheet set is erected in front of the transmitting end or in front of the receiving end, the clear aperture of the attenuation sheet set should be larger than the diameter of the laser beam, and the outer edge of the attenuation sheet set cannot shield the receiving end or the transmitting end.
By adopting the technical scheme, the attenuation in the laser propagation process can be simulated by arranging the attenuation sheet group, so that the far and near distances can be simulated, and the distance measurement power of the distance measuring machine can be accurately measured in an express way.
As a further description of the present invention, preferably, when the sighting telescope is used for distance measurement, if the echo rate is determined to meet the requirement, the attenuator is continuously added until the echo rate is lower than the echo rate required value, and then the attenuator with the relatively minimum attenuation value in the attenuator group is gradually removed to enable the echo rate to meet the requirement.
By adopting the technical scheme, the fine adjustment of the attenuation rate can be realized, and the accurate judgment of the echo rate is further improved.
As a further description of the present invention, it is preferable that the laser light scattering area of the white ball is calculated by multiplication by the size and the diffuse reflection coefficient of the white ball.
By adopting the technical scheme and combining the common sense technical scheme with the testing method, the pulse laser distance measuring machine can be subjected to power testing in a simple and quick mode, and the practicability is improved.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the invention can solve the problems that the angle between the target plate and the optical axis of the pulse laser distance measuring machine to be measured needs to be calibrated in advance and the distance measuring capability of the pulse laser distance measuring machine is easily limited by a fixed field to test by utilizing the white ball with adjustable direction and a plurality of groups of attenuation sheet sets and combining a novel test method, and can flexibly and conveniently test the distance measuring capability.
Drawings
FIG. 1 is a view showing the construction of the installation site of the present invention;
FIG. 2 is a block diagram of the tester of the present invention;
FIG. 3 is a graph comparing experimental data of the present invention.
In the figure: 1. a laser rangefinder; 11. a body; 12. a transmitting end; 13. a receiving end; 14. a sighting telescope; 2. a set of attenuation sheets; 3. a tester; 31. erecting a rod; 32. a cross bar; 33. a lifting rope; 34. white balls.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The utility model provides a pulse laser rangefinder range finding power test method, combine figure 1, figure 2, the equipment that adopts includes laser rangefinder 1, attenuation piece group 2 and tester 3, wherein laser rangefinder 1 includes organism 11, transmitting terminal 12, receiving terminal 13 and gun sight 14, transmitting terminal 12 and receiving terminal 13 all link firmly at organism 11 front end, gun sight 14 links firmly in organism 11 one side, gun sight 14 center is coaxial with the laser emission beam center of transmitting terminal 12, can make gun sight 14 sight and laser emission beam coincide and fall in the same position, in order to guarantee that laser can accurately fall on tester 3, and then guarantee the degree of accuracy of test.
With reference to fig. 1 and 2, the attenuation sheet group 2 is formed by mutually overlapping a plurality of attenuation sheets with different light transmittances, and the arrangement mode is distributed along the light propagation direction from small to large according to the transmittances; the attenuator group 2 is placed in front of the transmitting end 12 or the receiving end 13, preferably in front of the transmitting end 12; the clear aperture of the attenuation sheet group 2 should be larger than the diameter of the laser beam, the outer edge of the attenuation sheet group 2 cannot shield the receiving end 13 or the transmitting end 12, the attenuation sheet group is arranged to simulate the attenuation in the laser propagation process, the far and near distance can be simulated, and the distance measuring power of the distance measuring machine can be measured quickly and accurately.
With reference to fig. 1 and 2, the tester 3 includes an upright 31, a cross bar 32, a lifting rope 33 and a white ball 34, wherein the upright 31 and the cross bar 32 are all telescopic straight bars, so that the lengths of the upright 31 and the cross bar 32 can be adjusted, and further the upright 31 and the cross bar 32 can be changed according to different actual test requirements, so as to improve the applicability of the upright 31 and the cross bar 32; the vertical rod 31 is vertical in length direction, the cross rod 32 is horizontal in length direction, one end of the cross rod 32 is fixedly connected to the top end of the vertical rod 31, the length of the vertical rod 31 is 2.5 m-5 m, the length of the cross rod 32 is 1 m-2 m, the length of the vertical rod 31 is larger than that of the cross rod 32, and the vertical rod 31 and the cross rod 32 are both longer, so that the vertical rod 31 and the cross rod 32 are far away from the white ball 34, and the influence of reflected signals on the vertical rod 31 or the cross rod 32 before laser irradiation on the distance measurement of. One end of a lifting rope 33 is fixedly connected to the bottom of the tail end of the cross bar 32, the other end of the lifting rope 33 is fixedly connected with a white ball 34, the outer diameter of the white ball 34 is 60-200 mm, and a ball body with higher density is selected to enable the weight of the white ball 34 to be larger, or the white ball 34 is pulled straightly by a thin rope between the white ball 34 and the ground, so that the white ball is prevented from shaking; the minimum distance between the white ball 34 and the laser rangefinder 1 is 500 m.
Through the comparatively simple and easy test facility of above-mentioned, can effectively reduce the test cost to do not receive the place restriction, can adjust the position of white ball 34 or the mounted position of gun sight 14 according to actual conditions, and the quantity of attenuation piece in attenuation piece group 2, combine the novel test method that this application provided, can accurately test out pulsed laser rangefinder's range finding power, very practical.
The test method provided by the application comprises the following steps,
selecting a pulse laser range finder 1 with a divergence angle of 0.6 milliradian as a testing machine to be placed at one position, then installing a sighting telescope 14, hanging a white ball 34 at the bottom of the tail end of a cross rod 32 through a lifting rope 33, wherein the planes of the vertical rod 31 and the cross rod 32 are vertical to the optical axis of the laser range finder 1 so as to avoid the phenomenon that pulse laser irradiates the vertical rod 31 and the cross rod 32 to cause signal mutual interference and influence the range finder 1 on the judgment of a reflected signal of the white ball 34;
placing the tester 3 with the white ball 34 at a certain distance from the laser range finder 1, so that the white ball 1 is placed at a minimum distance of 133 meters, preferably 500 meters, away from the pulse laser range finder 1, and fine adjustment of the position of the white ball 1 is realized by adjusting the lengths of the upright rod 31 and the cross rod 32;
starting the laser range finder 1, adjusting the position of the laser range finder 1 by aiming with the sighting telescope 14 to enable laser to irradiate the white ball 34, and receiving the reflected signal by the receiving end 13; then, the attenuation sheet group 2 is added, the white ball 34 is collimated and measured through the collimating lens 14, whether the echo rate meets the requirement or not is judged according to the echo value, wherein the echo rate is required to reach 95%;
when the sighting telescope 14 is used for ranging, if the echo rate is judged to meet the requirement, the attenuation sheet is continuously added until the echo rate is lower than the echo rate required value, and then the attenuation sheet with the relatively minimum attenuation value in the attenuation sheet group 2 is gradually taken down until a critical stable ranging state is reached, namely the attenuation value can reach the maximum and the echo rate meets the requirement; after the attenuation sheet with the minimum attenuation value in the attenuation sheet group 2 is taken down, the white ball 34 needs to be aimed and measured, whether the echo rate meets the requirement or not is judged according to the echo value of the laser distance measuring machine 1, fine adjustment of the attenuation rate can be realized by increasing the attenuation sheets with large attenuation values and subsequently taking down the attenuation sheets with small attenuation values, and the accurate judgment of the echo rate is facilitated to be improved;
and V, calculating the laser scattering area of the white ball 34 by multiplying the size and the diffuse reflection coefficient of the white ball 34, calculating the laser scattering area of the white ball 34, and calculating the ranging distance of the laser range finder 1 under the specific atmospheric condition for the specific target to be ranged by combining the atmospheric condition of the test site, the distance value of the white ball 34 relative to the laser range finder 1 and the maximum attenuation value of the attenuation sheet group 2.
To verify the feasibility of the method, 1m was chosen2The target to be measured should satisfy more than 20km and 0.1m2The target to be measured should meet the requirement of more than 10km, and the target to be measured is taken as an index to carry out an experiment.
Two sets of experiments were then used for validation:
selecting the diameter of 0.14m and the laser scattering area of 0.0092m2The white ball 34 of (a) was tested in the field;
1. firstly, the white ball 34 is placed at a position which is 0.6km away from the laser range finder 1 for testing, the atmospheric visibility is 15km, when the attenuation value is maximized to reach a critical stable range finding state by adding or subtracting the attenuation sheet, and the echo rate is 95 percent (wherein 1m is2The laser attenuation value of the target to be measured is 58.91dB through theoretical calculation under the conditions that the distance of the target to be measured is more than 20km and the atmospheric visibility is 23.5 km), and the measured attenuation value is 62dB at the moment;
2. then the white ball 34 is placed at the position of the laser range finder 1 with the distance of 0.5km for testing, the atmospheric visibility is 15km, when the attenuation value is maximized to reach the critical stable range finding state by adding or subtracting the attenuation sheet, and the echo rate is 95 percent (wherein 0.1m2The laser attenuation value of the target to be measured is 61.8dB through theoretical calculation under the conditions that the distance of the target to be measured is more than 10km and the atmospheric visibility is 23.5 km), and the measured attenuation value is 65 dB.
As shown in fig. 3, through comparison of two sets of data, the test attenuation values of the two sets of experiments are both greater than the theoretical attenuation value, which can indicate that the index requirements are met; therefore, by adopting the method, the problems that the angle between the target plate and the optical axis of the pulse laser distance measuring machine to be measured needs to be calibrated in advance and the distance measuring power of the pulse laser distance measuring machine is easily limited by a fixed field can be solved, and the distance measuring capability test can be flexibly and conveniently carried out. And by combining the common sense technical scheme with the testing method, the power test can be simply and quickly carried out on the pulse laser distance measuring machine 1, and the practicability is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for testing the distance measurement power of a pulse laser distance measuring machine is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
i, hanging a white ball (34) at the bottom of the tail end of a cross bar (32) through a lifting rope (33);
II, placing the tester (3) at a certain distance from the laser range finder (1), wherein the tester (3) comprises an upright rod (31), a cross rod (32), a lifting rope (33) and a white ball (34), and ensuring that the white ball (34) is positioned in a laser divergence angle of the laser range finder (1);
increasing a damping sheet group (2), aiming and ranging the white ball (34) through an aiming lens (14), and judging whether the echo rate meets the requirement or not according to the echo value;
IV, taking down the attenuation sheet with the minimum attenuation value in the attenuation sheet group (2) until a critical stable ranging state is reached, aiming and ranging the white ball (34), and judging whether the echo rate meets the requirement or not according to the echo value of the laser range finder (1);
and V, calculating the laser scattering area of the white ball (34), and combining the atmospheric condition of the test site, the distance value of the white ball (34) relative to the laser range finder (1) and the maximum attenuation value of the attenuation sheet group (2) to calculate the ranging distance of the laser range finder (1) for the specific target to be ranged under the specific atmospheric condition.
2. The method for testing the ranging power of the pulse laser ranging machine according to claim 1, wherein the method comprises the following steps: the vertical rod (31) is vertical in length direction, the cross rod (32) is horizontal in length direction, one end of the cross rod (32) is fixedly connected to the top end of the vertical rod (31), the vertical rod (31) is 2.5-5 m in length, the cross rod (32) is 1-2 m in length, and the vertical rod (31) is longer than the cross rod (32).
3. The method for testing the ranging power of the pulse laser ranging machine according to claim 2, wherein the method comprises the following steps: the upright rods (31) and the cross rods (32) are telescopic slide rods.
4. The method for testing the ranging power of the pulse laser ranging machine according to claim 3, wherein the method comprises the following steps: the planes of the vertical rod (31) and the transverse rod (32) are vertical to the optical axis of the laser range finder (1).
5. The method for testing the ranging power of the pulse laser ranging machine according to claim 4, wherein the method comprises the following steps: the outer diameter of the white ball (34) is 60-200 mm, and the minimum distance between the white ball (34) and the laser range finder (1) is 500 m.
6. The method for testing the ranging power of the pulse laser ranging machine according to claim 5, wherein the method comprises the following steps: laser rangefinder (1) includes organism (11), transmitting terminal (12), receiving terminal (13) and gun sight (14), and transmitting terminal (12) and receiving terminal (13) all link firmly at organism (11) front end, and gun sight (14) link firmly in organism (11) one side, and gun sight (14) center is coaxial with the laser emission beam center of transmitting terminal (12).
7. The method for testing the ranging power of the pulse laser ranging machine according to claim 6, wherein the method comprises the following steps: the attenuation sheet group (2) is erected in front of the transmitting end (12) or the receiving end (13), the clear aperture of the attenuation sheet group (2) is larger than the diameter of the laser beam, and the outer edge of the attenuation sheet group (2) cannot shield the receiving end (13) or the transmitting end (12).
8. The method for testing the ranging power of the pulse laser ranging machine according to claim 7, wherein the method comprises the following steps: when the sighting telescope (14) is used for distance measurement, if the echo rate is judged to meet the requirement, the attenuation sheet is continuously added until the echo rate is lower than the echo rate required value, and then the attenuation sheet with the relatively minimum attenuation value in the attenuation sheet group (2) is gradually taken down so that the echo rate meets the requirement.
9. The method for testing the ranging power of the pulse laser ranging machine according to claim 8, wherein the method comprises the following steps: the laser scattering area of the white ball (34) can be calculated by multiplication according to the size and the diffuse reflection coefficient of the white ball (34).
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