CN215005863U - Distance measuring system - Google Patents
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- CN215005863U CN215005863U CN202120279589.9U CN202120279589U CN215005863U CN 215005863 U CN215005863 U CN 215005863U CN 202120279589 U CN202120279589 U CN 202120279589U CN 215005863 U CN215005863 U CN 215005863U
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Abstract
The application relates to a distance measuring system, which comprises an acousto-optic crystal, a laser transmitting device, an ultrasonic transmitting device and a signal receiving and processing device, wherein the laser transmitting device and the signal receiving and processing device are respectively arranged at two opposite sides of the acousto-optic crystal; the laser emitting device emits laser to the acousto-optic crystal, the ultrasonic emitting device emits ultrasonic to the acousto-optic crystal, the signal receiving and processing device collects a first diffraction light signal generated by the acousto-optic effect of the ultrasonic and the laser which are emitted into the acousto-optic crystal, collects a second diffraction light signal generated by the acousto-optic effect of the ultrasonic and the laser which return after reaching the surface of the target object to be measured, acquires a collected time difference, and obtains a measuring distance according to the time difference and a preset ultrasonic propagation speed. By adopting the method and the device, the measurement precision is high and the application range is wide.
Description
Technical Field
The application relates to the technical field of measurement, in particular to a distance measuring system.
Background
With the development of technology, non-contact measurement technology has emerged. The non-contact measurement is a measurement method for obtaining the parameter information of the object surface under the condition of not contacting the surface of the measured object based on the technologies of photoelectricity, electromagnetism and the like. For example, for non-contact distance measurement, the time-of-flight based distance measurement mainly includes ultrasonic ranging and laser ranging.
Traditional ultrasonic ranging's precision is not high, and the error is great, and laser ranging is superior to ultrasonic ranging in the precision of range finding, nevertheless because the laser is not good to transparent and translucent object test effect, the laser is not good in turbid liquid, visibility is not high and have the atmosphere of haze spreading nature, consequently can restrict laser ranging's the scope of use.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a ranging system with improved measurement accuracy and a wide application range.
A ranging system, comprising: the device comprises an acousto-optic crystal, a laser emitting device, an ultrasonic emitting device and a signal receiving and processing device, wherein the laser emitting device and the signal receiving and processing device are respectively arranged on two opposite sides of the acousto-optic crystal;
the laser emitting device emits laser to the acousto-optic crystal, the ultrasonic emitting device emits ultrasonic to the acousto-optic crystal, the signal receiving and processing device collects a first diffraction light signal generated by the acousto-optic effect of the laser and the ultrasonic which is emitted into the acousto-optic crystal, collects a second diffraction light signal generated by the acousto-optic effect of the laser in the acousto-optic crystal and the ultrasonic which returns after the acousto-optic crystal reaches the surface of the target object to be measured, acquires the time difference of collecting the first diffraction light signal and the second diffraction light signal, and obtains the measuring distance according to the time difference and the preset ultrasonic propagation speed.
According to the distance measuring system, the acousto-optic effects of the laser and the ultrasonic are applied to distance measurement, the advantages of the traditional ultrasonic distance measurement and the traditional laser distance measurement are combined together, firstly, the measured distance measurement is based on ultrasonic propagation, so that the sound velocity of the ultrasonic is only one hundred thousand times of the light velocity under the same flight time precision, and the precision of the ultrasonic distance measurement is greatly improved relative to that of the laser distance measurement; secondly, the conversion from an ultrasonic signal to an optical signal is realized by using an acousto-optic effect, and based on acousto-optic effect distance measurement, ultrasonic waves are insensitive to color and illumination, so that the method is suitable for identifying transparent, semitransparent and objects with poor diffuse reflection, and can be used for distance measurement in dark, dusty or smog, strong electromagnetic interference and other severe environments, thereby overcoming the problem of environmental sensitivity and obtaining high-precision distance measurement in complex environments. Therefore, the problems of low ultrasonic distance measurement precision and environmental sensitivity of laser distance measurement can be solved, and the ultrasonic distance measurement device is high in measurement precision and wide in application range.
In one embodiment, the incident direction of the laser light and the incident direction of the ultrasonic wave are perpendicular to each other.
In one embodiment, the laser emitting device is an infrared laser.
In one embodiment, the ultrasonic wave emitting device comprises an excitation signal controller and an ultrasonic transducer, the excitation signal controller is connected with the ultrasonic transducer, and the ultrasonic transducer is arranged on one side of the acousto-optic crystal opposite to the target object to be measured;
the excitation signal controller sends a pulse signal to the ultrasonic transducer, and the ultrasonic transducer receives the pulse signal and transmits ultrasonic waves to the acousto-optic crystal.
In one embodiment, the signal receiving and processing device comprises a photodetector and a computing unit, the photodetector is connected with the computing unit, and the photodetector is arranged on one side of the acousto-optic crystal opposite to the laser emitting device;
the photoelectric detector receives the first diffraction light signal and records time to obtain a first moment, and receives the second diffraction light signal and records time to obtain a second moment; and the calculation unit calculates the measurement distance according to the first moment, the second moment and the ultrasonic propagation speed.
In one embodiment, the distance measuring system further includes a diaphragm disposed between the laser emitter and the acousto-optic crystal, and the laser emitted by the laser emitter passes through the diaphragm and then is incident into the acousto-optic crystal.
In one embodiment, the distance measuring system further includes a filter component disposed in front of the signal receiving and processing device, the filter component is configured to filter the first diffracted light signal and the second diffracted light signal, and the signal receiving and processing device collects the diffracted light signals filtered by the filter component.
In one embodiment, the filter assembly includes a first polarizer and a second polarizer, the first polarizer is located between the laser emitting device and the acousto-optic crystal, and the second polarizer is located between the acousto-optic crystal and the signal receiving and processing device.
In one embodiment, the distance measuring system further comprises a lens, and the lens is located between the acousto-optic crystal and the signal receiving and processing device.
In one embodiment, the distance measuring system further comprises an adjustable bracket, and the ultrasonic wave emitting device is arranged on the adjustable bracket.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a ranging system in one embodiment;
FIG. 2 is a schematic diagram of a distance measuring system according to another embodiment;
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, as shown in fig. 1, there is provided a ranging system comprising: the acousto-optic crystal 110, the laser emitting device 130, the ultrasonic emitting device 150 and the signal receiving and processing device 170; the laser emitting device 130 and the signal receiving and processing device 170 are respectively disposed on two opposite sides of the acousto-optic crystal 110, the ultrasonic emitting device 150 and the target object 200 to be measured are respectively disposed on two opposite sides of the acousto-optic crystal 110, and the laser emitting device 130 and the ultrasonic emitting device 150 are disposed on two adjacent sides of the acousto-optic crystal 110. For example, taking the acousto-optic crystal 110 as a three-dimensional hexahedron as an example, the acousto-optic crystal includes an upper surface, a lower surface, a front surface, a rear surface, a left surface and a right surface, the laser emitting device 130 is disposed on one side of the rear surface of the acousto-optic crystal 110, the signal receiving processing device 170 is disposed on one side of the front surface of the acousto-optic crystal 110, the ultrasonic emitting device 150 is disposed on one side of the left surface of the acousto-optic crystal 110, and the object 200 to be measured is disposed on one side of the right surface of the acousto-optic crystal 110.
Wherein, the laser emitting device 130 is a device capable of emitting laser, and the ultrasonic emitting device 150 is a device capable of emitting ultrasonic; the acousto-optic crystal 110 is an acousto-optic coupling medium, when laser passes through the acousto-optic crystal 110 with an ultrasonic field, the refractive index of the acousto-optic crystal 110 changes periodically due to the action of the ultrasonic field, and a phase grating is formed similarly, when the laser passes through the phase grating, diffraction action can occur, that is, acousto-optic effect can occur between the laser and ultrasonic waves in the acousto-optic crystal 110, and a diffraction light signal is generated.
The signal receiving and processing device 170 is a device that can detect and process the optical signal. Specifically, the laser emitting device 130 emits laser light to the acousto-optic crystal 110, and the ultrasonic emitting device 150 emits ultrasonic waves to the acousto-optic crystal 110; the signal receiving and processing device 170 collects a first diffraction light signal generated by the acousto-optic effect of the ultrasonic wave and the laser which are irradiated into the acousto-optic crystal 110, collects a second diffraction light signal generated by the acousto-optic effect of the ultrasonic wave and the laser in the acousto-optic crystal 110 which are returned after the acousto-optic crystal 110 reaches the surface of the object 200 to be measured, obtains a time difference between the first diffraction light signal and the second diffraction light signal, and obtains a measurement distance according to the time difference and a preset ultrasonic propagation speed. That is, after the laser emitting device 130 emits laser to the acousto-optic crystal 110 and the ultrasonic emitting device 150 emits ultrasonic to the acousto-optic crystal 110, the laser and the ultrasonic generate acousto-optic effect in the acousto-optic crystal 110 to generate diffraction light signals as first diffraction light signals, the ultrasonic passes through the acousto-optic crystal 110 and then reaches the surface of the object 200 to be measured and returns, and the returned ultrasonic generates acousto-optic effect with the laser again in the acousto-optic crystal 110 to generate diffraction light signals as second diffraction light signals; the signal receiving and processing device 170 collects the first time diffraction light signal and the second time diffraction light signal and obtains the time difference of the two times. Specifically, the signal reception processing device 170 collects the signals of the diffracted light twice within one pulse ultrasound period.
Specifically, the signal reception processing device 170 may record the time when the first diffraction light signal is received and the time when the second diffraction light signal is received, and calculate the time difference between the recorded times. It is understood that the signal receiving and processing device 170 can also obtain the time difference in other manners, such as starting the timing when the first diffraction light signal is received, and stopping the timing when the second diffraction light signal is received, so as to obtain the time difference.
The measurement distance is a distance from the target object 200 to be measured. The signal receiving device 170 may obtain the measured distance by a conventional calculation method, for example, by calculating the measured distance by a conventional calculation model.
In the distance measuring system, the laser emitting device 130 and the ultrasonic emitting device 150 are adopted to respectively emit laser and ultrasonic waves to the acousto-optic crystal 110, the signal receiving and processing device 170 is used for collecting a first diffraction light signal generated by acousto-optic effect of the laser and the ultrasonic waves and a second diffraction light signal generated by acousto-optic effect of the ultrasonic waves and the laser after the ultrasonic waves reach the surface of the target object 200 to be measured and return, and the measuring distance is obtained according to the time difference of two times of collection and the preset ultrasonic propagation speed; the acousto-optic effect of laser and ultrasonic is applied to distance measurement, the advantages of the traditional ultrasonic distance measurement and the traditional laser distance measurement are combined together, firstly, the measured distance measurement is based on ultrasonic propagation, so that under the same flight time precision, the sound velocity of the ultrasonic is only one hundred thousand of the light velocity, and the precision of the ultrasonic relative to the laser distance measurement is greatly improved; secondly, the conversion from an ultrasonic signal to an optical signal is realized by using an acousto-optic effect, and based on acousto-optic effect distance measurement, ultrasonic waves are insensitive to color and illumination, so that the method is suitable for identifying transparent, semitransparent and objects with poor diffuse reflection, and can be used for distance measurement in dark, dusty or smog, strong electromagnetic interference and other severe environments, thereby overcoming the problem of environmental sensitivity and obtaining high-precision distance measurement in complex environments. Therefore, the problems of low ultrasonic distance measurement precision and environmental sensitivity of laser distance measurement can be solved, and the ultrasonic distance measurement device is high in measurement precision and wide in application range.
In addition, because the laser propagation speed in the traditional laser ranging is very high, if short-distance high-precision measurement is to be realized, a photoelectric detector with a high response speed is needed, and the cost is high. Compared with the traditional laser ranging, the ranging system has the advantages of low cost and simple structure in the aspect of accurate ranging of small distance.
In one embodiment, the acousto-optic crystal 110 is an acousto-optic crystal with an acousto-optic figure of merit higher than a preset value. The preset value can be specifically set to be a higher acousto-optic merit value according to actual needs. An acousto-optic crystal with high acousto-optic merit value is used as a medium for generating acousto-optic effect, particularly Bragg diffraction, by ultrasonic waves and laser, and the high acousto-optic merit value is beneficial to improving the coupling efficiency, improving the intensity of diffracted light signals and improving the signal-to-noise ratio of the signals.
In one embodiment, the incident direction of the laser light and the incident direction of the ultrasonic wave are perpendicular to each other. Specifically, the emitting direction of the ultrasonic sound beam can be adjusted, so that the ultrasonic sound beam is perpendicular to the laser beam, and the acousto-optic effect is better generated.
In one embodiment, the laser emitting device 130 is an infrared laser. The infrared laser is a device for emitting infrared laser, and has small divergence angle of infrared laser beams, high brightness and good use effect.
In one embodiment, as shown in fig. 2, the distance measuring system further includes an aperture 140, the aperture 140 is disposed between the laser emitting device 130 and the acousto-optic crystal 110, and the laser emitted by the laser emitting device 130 passes through the aperture 140 and then enters the acousto-optic crystal 110.
Through the very little diaphragm 140 of diameter, only let laser beam central part pass through, reduce laser beam's diameter, when improving laser beam's homogeneity, can reduce the ultrasonic wave time of passing through laser beam to obtain more accurate time point, improve the time precision of gathering the signal, and then improve distance measurement's the degree of accuracy.
Specifically, the diaphragm 140 may be a diaphragm with an aperture-adjustable aperture, and the size of the laser beam passing through the diaphragm 140 is adjusted by adjusting the aperture of the aperture, which is convenient to operate.
In one embodiment, referring to fig. 2, the ultrasonic wave emitting device 150 includes an excitation signal controller 151 and an ultrasonic transducer 153, the excitation signal controller 151 is connected to the ultrasonic transducer 153, and the ultrasonic transducer 153 is disposed on a side of the acousto-optic crystal 110 opposite to the target object 200 to be measured.
The excitation signal controller 151 sends a pulse signal to the ultrasonic transducer 153, and the ultrasonic transducer 153 receives the pulse signal and transmits an ultrasonic wave to the acousto-optic crystal 110. Specifically, the excitation signal controller 151 completes control of the high-voltage excitation signal, i.e., the pulse signal, according to the set control parameters. The structure is simple by controlling the ultrasonic transducer 153 to emit ultrasonic waves using the excitation signal controller 151.
In one embodiment, referring to fig. 2, the signal receiving and processing device 170 includes a photodetector 171 and a computing unit (not shown), the photodetector 171 is connected to the computing unit, and the photodetector 171 is disposed on the side of the acousto-optic crystal 110 opposite to the laser emitting device 130. The photodetector 171 receives the first diffraction light signal and records the time to obtain a first time, and receives the second diffraction light signal and records the time to obtain a second time; the calculation unit calculates the measurement distance according to the first time, the second time and the ultrasonic propagation speed.
In particular, the calculation unit may be according to the formula:
and calculating to obtain the measurement distance. Wherein L is the measurement distance, V is the ultrasonic propagation velocity, and T2Is a second time, T1Is the first time.
The photoelectric detector 171 is used to detect the diffraction light signal generated by the acousto-optic effect to obtain the time difference between the action of the ultrasonic wave emitted from the ultrasonic transducer 153 and the laser in the acousto-optic crystal 110 and the action of the ultrasonic wave reflected back to the acousto-optic crystal 110 by the object 200 to be measured and the laser in the acousto-optic crystal 110, so as to obtain the flight time of the ultrasonic wave, and the distance of the object 200 to be measured can be accurately measured by combining the ultrasonic propagation speed. The time information acquired by the photodetector 171 has a faster response speed and higher time accuracy than a conventional ultrasonic probe, and thus the ranging based on the acousto-optic effect has higher accuracy than a conventional ultrasonic ranging.
Specifically, the photodetector 171 may employ a high-frequency single-point photodetector to accurately obtain the time point when the incident ultrasonic wave and the returned ultrasonic wave interact with the laser in sequence to generate the diffraction light signal, thereby improving the test accuracy.
In one embodiment, the distance measuring system further includes a filter component disposed in front of the signal receiving and processing device 170, the filter component is configured to filter the first diffracted light signal and the second diffracted light signal, and the signal receiving and processing device 170 collects the diffracted light signals filtered by the filter component. The light filtering component is used for filtering the diffracted light signals, and particularly laser signals which are not diffracted can be filtered, so that the signal-to-noise ratio of the diffracted light signals is increased, the accuracy of light signal acquisition is improved, and the accuracy of distance measurement is improved.
In one embodiment, with continued reference to fig. 2, the filter assembly includes a first polarizer 181 and a second polarizer 182, the first polarizer 181 is located between the laser emitting device 130 and the acousto-optic crystal 110, and the second polarizer 182 is located between the acousto-optic crystal 110 and the signal receiving and processing device 170.
Specifically, the laser light emitted from the laser emitting device 130 vertically enters the acousto-optic crystal 110 through the first polarizer 181, and the laser light exits from the acousto-optic crystal 110 through the second polarizer 182. Further, the polarization directions of the first and second polarizing plates 181 and 182 are perpendicular. By using the two polarizing plates with the vertical polarization directions, laser which does not participate in the acousto-optic effect part cannot continuously pass through the two polarizing plates with the vertical polarization directions according to the polarization degree characteristic of the laser, so that laser signals which are not diffracted can be filtered, the influence of incident laser on diffraction light signals is reduced, and the signal-to-noise ratio of the diffraction light signals is increased.
In one embodiment, the laser emitting device 130 emits laser light with a polarization degree higher than a predetermined polarization degree. That is, the laser emitted by the laser emitting device 130 has a higher polarization degree, and the higher the polarization degree of the laser is, the weaker the optical signal that does not participate in the acousto-optic effect after passing through the two polarizers is, the higher the signal-to-noise ratio of the system is.
In one embodiment, with continued reference to FIG. 2, the distance measuring system further includes a lens 190, and the lens 190 is located between the acousto-optic crystal 110 and the signal receiving and processing device 170. The lens 190 is used for condensing the diffraction light signal emitted by the acousto-optic crystal 110, so as to facilitate the signal receiving and processing device 170 to collect the signal.
In one embodiment, the distance measuring system further comprises an adjustable bracket, and the ultrasonic wave emitting device 150 is disposed on the adjustable bracket. The adjustable support is a support with adjustable position, in particular, the adjustable support is a support with adjustable angle. The ultrasonic emission grab roller 150, particularly the ultrasonic transducer 153 is fixed by adopting the angle-adjustable bracket, so that the direction of the ultrasonic wave entering the acousto-optic crystal 110 can be adjusted, and the use convenience is high.
As shown in fig. 2, the steps of using the ranging system are described in a detailed embodiment:
s1: the infrared laser emits laser, the laser passes through a diaphragm 140, the diaphragm 140 is provided with a small hole with adjustable aperture, the diameter of the small hole can be adjusted to be small, and the laser beam can be changed into a laser beam with the diameter consistent with the diameter of the aperture of the diaphragm 140 through the diaphragm 140 by adjusting the beam; the laser beam passes through the first polarizer 181, and becomes polarized light with a certain polarization direction, and the polarized light vertically enters the acousto-optic crystal 110.
S2: the second polarizer 182 is adjusted to be detected by the laser power meter when the power transmitted through both polarizers is the lowest, so that the laser power through the second polarizer 182 is the lowest when no ultrasound is passing through the acousto-optic crystal 110.
S3: the excitation signal controller 151 is turned on to generate a pulse signal to the ultrasonic transducer 153, the ultrasonic transducer 153 emits an ultrasonic wave by the pulse excitation signal given to the ultrasonic transducer 153 by the excitation signal controller 151, and the emitting direction of the ultrasonic wave is adjusted to make the ultrasonic wave perpendicular to the laser.
The ultrasonic wave enters the acousto-optic crystal 110, the ultrasonic wave and the laser generate acousto-optic effect in the acousto-optic crystal 110 and generate diffraction light, a diffraction light signal emitted from the acousto-optic crystal 110 passes through the second polarizing plate 182, the laser without acousto-optic effect is filtered, the diffraction light signal enters the photoelectric detector 171 through the lens 190, the diffraction light signal is obtained through the photoelectric detector 171, and meanwhile, the acquisition time T1 is recorded.
S4: the ultrasonic wave is reflected by the object 200 to be measured and returns to enter the acousto-optic crystal 110, an acousto-optic effect is generated with the laser for the second time, a diffraction light signal emitted from the acousto-optic crystal 110 sequentially passes through the second polaroid 18 and the lens 190 and enters the photoelectric detector 171, the diffraction light signal is obtained through the photoelectric detector 171, and meanwhile, the acquisition time T2 is recorded.
S5: and finally, calculating the measurement distance by a calculation unit as follows:
because the measured measurement distance is half of the product of the ultrasonic propagation speed and the measured ultrasonic flight time, the ultrasonic propagation speed is only one hundred thousandth of the light speed under the same flight time precision, and the precision of the corresponding laser ranging is greatly improved.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A ranging system, comprising: the device comprises an acousto-optic crystal, a laser emitting device, an ultrasonic emitting device and a signal receiving and processing device, wherein the laser emitting device and the signal receiving and processing device are respectively arranged on two opposite sides of the acousto-optic crystal;
the laser emitting device emits laser to the acousto-optic crystal, the ultrasonic emitting device emits ultrasonic to the acousto-optic crystal, the signal receiving and processing device collects a first diffraction light signal generated by the acousto-optic effect of the laser and the ultrasonic which is emitted into the acousto-optic crystal, collects a second diffraction light signal generated by the acousto-optic effect of the laser in the acousto-optic crystal and the ultrasonic which returns after the acousto-optic crystal reaches the surface of the target object to be measured, acquires the time difference of collecting the first diffraction light signal and the second diffraction light signal, and obtains the measuring distance according to the time difference and the preset ultrasonic propagation speed.
2. The ranging system according to claim 1, wherein the incident direction of the laser light and the incident direction of the ultrasonic wave are perpendicular to each other.
3. A ranging system according to claim 1, characterized in that the laser emitting device is an infrared laser.
4. The distance measuring system according to claim 1, wherein the ultrasonic wave emitting device comprises an excitation signal controller and an ultrasonic transducer, the excitation signal controller is connected with the ultrasonic transducer, and the ultrasonic transducer is arranged on the side of the acousto-optic crystal opposite to the target object to be measured;
the excitation signal controller sends a pulse signal to the ultrasonic transducer, and the ultrasonic transducer receives the pulse signal and transmits ultrasonic waves to the acousto-optic crystal.
5. The distance measuring system according to claim 1, wherein said signal receiving and processing device comprises a photodetector and a computing unit, said photodetector is connected to said computing unit, said photodetector is disposed on the side of said acousto-optic crystal opposite to said laser emitting device;
the photoelectric detector receives the first diffraction light signal and records time to obtain a first moment, and receives the second diffraction light signal and records time to obtain a second moment; and the calculation unit calculates the measurement distance according to the first moment, the second moment and the ultrasonic propagation speed.
6. The distance measuring system according to claim 1, further comprising an aperture disposed between the laser emitting device and the acousto-optic crystal, wherein the laser emitted by the laser emitting device passes through the aperture and then enters the acousto-optic crystal.
7. The distance measuring system of claim 1, further comprising a filter component disposed in front of the signal receiving and processing device, wherein the filter component is configured to filter the first diffracted light signal and the second diffracted light signal, and the signal receiving and processing device collects the diffracted light signals filtered by the filter component.
8. The range finding system of claim 7 wherein the filter assembly comprises a first polarizer and a second polarizer, the first polarizer being located between the laser emitting device and the acousto-optic crystal, the second polarizer being located between the acousto-optic crystal and the signal processing device.
9. The range finding system of claim 1 further comprising a lens positioned between the acousto-optic crystal and the signal receiving and processing device.
10. The range finding system of claim 1, further comprising an adjustable bracket, wherein the ultrasonic emitting device is disposed on the adjustable bracket.
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