A laser rangefinder

Abstract

The present application discloses a laser rangefinder, which includes a visual system, a laser ranging system, a refraction parameter measurement system, an angle providing component, and a prompt processing component; the visual system is used to provide a user with a target for observation; the laser ranging system is used to measure the distance of the target; the refraction parameter measurement system is provided with a medium accommodating chamber, and the refraction parameter measurement system is used to measure the refraction parameter of the liquid in the medium accommodating chamber; wherein, when the user observes the target in the liquid through the visual system, the angle providing component is used to provide the angle between the optical axis of the visual system and the liquid surface, and the refraction parameter measurement system is used to measure the refraction parameter of the liquid, and the prompt processing component is used to determine the azimuth information of the target in the liquid based on the angle and the refraction parameter, and prompt the azimuth information. In the above manner, the present application can achieve the distance measurement of the target in the liquid.

Description

Technical Field

[0001] The present application relates to the technical field of optical distance measurement, and in particular to a laser distance meter. Background Art

[0002] Laser rangefinder is an instrument that uses laser to measure the distance to a target. At present, laser rangefinder is widely used in various outdoor scenes.

[0003] Usually, when using a rangefinder, the user first uses the eyepiece of the rangefinder to aim at the target, and then uses the rangefinder to measure the distance to the target aimed at by the user. However, when the target aimed at by the user is located in a liquid such as water, the rangefinder cannot find the target because the eyepiece sees a virtual image, and thus cannot measure the distance to the target. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a laser rangefinder capable of measuring the distance of a target in a liquid.

[0005] In order to solve the above technical problems, a technical solution adopted by the present application is: providing a laser rangefinder, which includes a visual system, a laser ranging system, a refraction parameter measurement system, an angle providing component, and a prompt processing component; the visual system is used to provide a user with an observation target; the laser ranging system is used to measure the distance of the target; the refraction parameter measurement system is provided with a medium accommodating chamber, and the refraction parameter measurement system is used to measure the refraction parameter of the liquid in the medium accommodating chamber; wherein, when the user observes the target located in the liquid through the visual system, the angle providing component is used to provide the angle between the optical axis of the visual system and the liquid surface of the liquid, and the refraction parameter measurement system is used to measure the refraction parameter of the liquid, and the prompt processing component is used to determine the orientation information of the target located in the liquid based on the angle and the refraction parameter, and prompt the orientation information.

[0006] In some embodiments, the refraction parameter measurement system also includes an optical channel and a parameter measurement detector, wherein the parameter measurement detector is arranged at the bottom of the medium accommodating chamber, and an opening is arranged at the top of the medium accommodating chamber; wherein the parameter measurement laser is incident on the medium accommodating chamber from the opening through the optical channel, and is refracted by the liquid in the medium accommodating chamber to the parameter measurement detector at the bottom, and the parameter measurement detector is used to output response position information to the parameter measurement laser, so as to determine the refraction parameter of the liquid in the medium accommodating chamber, and the parameter measurement laser is the same type of laser as the ranging laser used in the laser ranging system.

[0007] Wherein, the parameter measurement detector is a codable detector.

[0008] Wherein, a switch portion is provided at a position on the top of the medium accommodating cavity corresponding to the opening, and the switch portion is used to open or close the opening.

[0009] In some embodiments, the laser ranging system includes a laser emission system, which includes a laser source and a first spectroscope. The refraction parameter measurement system also includes a first collimating lens, which is located on the optical channel. The ranging laser emitted by the laser source is separated into a first ranging laser and a second ranging laser by the first spectroscope. The first ranging laser is used to detect targets, and the second ranging laser is used as the parameter measurement laser.

[0010] The laser amount of the first distance measuring laser may be greater than the laser amount of the second distance measuring laser.

[0011] The first path of the ranging laser is obtained by transmission of the first beam splitter, and the second path of the ranging laser is obtained by reflection of the first beam splitter.

[0012] In some embodiments, the refraction parameter of the liquid is measured by using a parameter measuring laser to pass through the liquid in the medium containing cavity, and the refraction parameter is the refraction angle when the parameter measuring laser is incident on the liquid. The prompt processing component is used to determine the refractive index of the liquid based on the refraction angle and the incident angle when the parameter measuring laser is incident on the liquid, determine the azimuth of the target located in the liquid based on the included angle and the refractive index, and prompt the azimuth, wherein the incident angle is measured by using the parameter measuring laser to be incident on the empty medium containing cavity.

[0013] In which, the refraction parameter measurement system also includes a temperature sensor arranged inside or on the outer surface of the medium containing cavity; when the temperature sensor is used to determine that the temperature of the medium containing cavity is in a fluctuating state, the incident angle is measured when the parameter measurement laser is not deflected in the empty medium containing cavity.

[0014] In some embodiments, the angle providing component is an angle sensor, the positional relationship between the angle sensor and the optical axis of the visual system is fixed, and the angle sensor is used to detect the azimuth angle of the optical axis as the angle between the optical axis and the liquid surface.

[0015] In some embodiments, the angle providing component is a bracket, which includes a clamping portion and a supporting portion for supporting the clamping portion, and the visual system is arranged on the clamping portion, wherein the angle between the clamping portion and the supporting portion is fixed so that the azimuth angle of the optical axis of the visual system is fixed to a preset azimuth angle, or the angle between the clamping portion and the supporting portion is variable so that the azimuth angle of the optical axis of the visual system can be switched between multiple preset azimuth angles, wherein the preset azimuth angle is used as the angle between the optical axis and the liquid surface.

[0016] In some embodiments, the visual system includes an objective lens, an eyepiece and an image transfer prism, wherein the image transfer prism is disposed between the objective lens and the eyepiece; the prompt processing component includes a display screen, and the display screen is disposed at the object focus of the eyepiece.

[0017] In some embodiments, the laser ranging system includes: a laser emitting system, the laser emitting system includes a laser source and a lens group, the ranging laser emitted by the laser source forms a parallel outgoing laser through the lens group to detect the target; a laser receiving system, the laser receiving system includes a ranging detector, the ranging detector is provided with a photosensitive surface, and the photosensitive surface is used to receive the echo laser reflected by the target from the parallel outgoing laser.

[0018] Among them, the lens group includes a second collimating lens and a third collimating lens, and the laser emitting system also includes a first beam splitter, which is arranged between the second collimating lens and the third collimating lens. The ranging laser emitted by the laser source is incident on the first beam splitter through the second collimating lens, and the first beam splitter separates a first path of ranging laser from the incident ranging laser, and the first path of ranging laser forms the parallel output laser through the third collimating lens.

[0019] Wherein, the distance measuring system further comprises an optical element arranged between the second collimating lens and the third collimating lens, the third collimating lens is a splicing lens, comprising a first transmission area and a second transmission area, at least part of the distance measuring laser passing through the second collimating lens is emitted to the first transmission area of ​​the splicing lens through the optical element, the echo laser is transmitted to the optical element after passing through the second transmission area of ​​the splicing lens, and is emitted to the distance measuring detector through the optical element; wherein, the optical element is a perforated reflector, the distance measuring laser is emitted to the splicing lens through the perforations in the perforated reflector, and the echo laser is reflected to the distance measuring detector through the perforated reflector; or, the optical element is a second beam splitter, the distance measuring laser is transmitted to the splicing lens through the second beam splitter, and the echo laser is reflected to the distance measuring detector through the second beam splitter.

[0020] In some embodiments, the laser rangefinder is a handheld rangefinder.

[0021] In the above scheme, the laser rangefinder is equipped with an angle providing component, a refraction parameter measurement system and a prompt processing component, and the refraction parameter measurement system is provided with a medium accommodating chamber. When a user observes a target located in a liquid, the angle providing component is used to provide the angle between the optical axis of the visual system and the liquid surface, and the liquid is placed in the medium accommodating chamber. The refraction parameter measurement system is used to measure the refraction parameter of the liquid, and then the prompt processing component is used to determine the orientation information of the target located in the liquid based on the angle and the refraction parameter of the liquid, and the orientation information of the target is prompted. Therefore, the user can move the laser rangefinder toward the target based on the prompted orientation information, so that the laser ranging system in the laser rangefinder can detect the target, thereby realizing the ranging of the target in the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an implementation method of the laser rangefinder of the present application;

[0023] Figure 2 is a schematic diagram of target imaging in liquid;

[0024] Figure 3 Schematic diagram of the transmission area distribution of the spliced ​​lens used in one embodiment of the laser rangefinder of the present application;

[0025] Figure 4 It is a schematic diagram of the measurement principle of the refractive index of the liquid of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0027] See also Figure 1 , Figure 1 It is a schematic diagram of the structure of an embodiment of the laser rangefinder of the present application. In this embodiment, the laser rangefinder 10 includes a visual system 11, a laser rangefinder system 12, a refraction parameter measurement system 13, an angle providing component 14 and a prompt processing component 15. Among them, the visual system 11 and the laser rangefinder system 12 are relatively fixedly arranged. The visual system 11 is used to provide the user with an object to observe. The laser rangefinder system 12 is used to measure the distance of the object observed by the user. The refraction parameter measurement system 13 is provided with a medium accommodating chamber 131, and the refraction parameter measurement system 13 is used to measure the refraction parameter of the liquid in the medium accommodating chamber 131, and then the refractive index of the liquid can be calculated using the refraction parameter of the liquid.

[0028] When the user observes a target in a liquid (such as water) through the visual system 11, Figure 2 As shown, since the visual system sees the image point, the ranging laser emitted by the laser ranging system 12 can only detect the area where the image point is located, so it is impossible to detect the actual object point position of the target. Therefore, in this embodiment, the angle providing component 14 is used to provide the angle between the optical axis of the visual system 11 and the liquid surface. , and using the refraction parameter measurement system 13 to measure the refraction parameter of the liquid, using the prompt processing component 14 based on the angle The laser rangefinder 10 can be used to determine the position information of the target in the liquid based on the position information and the refraction parameter, and the position information can be prompted. Thus, the user can move the laser rangefinder 10 toward the target based on the prompted position information, so that the laser ranging system 12 in the laser rangefinder 10 can detect the target, thereby achieving the distance measurement of the target in the liquid.

[0029] Specifically, the visual system 11 includes an eyepiece 111, a rotating prism 112 and an objective lens 113. The rotating prism 112 is arranged between the objective lens 113 and the eyepiece 111, and the line connecting the centers of the eyepiece 111, the rotating prism 112 and the objective lens 113 forms the optical axis of the visual system 11. In the present embodiment, the eyepiece 111, the rotating prism 112 and the objective lens 113 form a telescope. Among them, the objective lens 113 is used to collect and focus the light from the target, which can be a large-caliber spherical or aspherical lens or reflector. The eyepiece 111 is used to further amplify the light focused by the objective lens 113 to form an image for the observer to observe, which can be a small-caliber lens or reflector. The rotating prism 112 is used to change the optical path, such as converting an inverted image into an upright image, so that the observer can observe comfortably through the eyepiece 111. It is understandable that the visual system 11 may be provided with or without the image transfer prism 112 according to actual needs, which is not limited here.

[0030] The angle providing component 14 of this embodiment is an angle sensor 14. The positional relationship between the angle sensor 14 and the optical axis of the visual system 11 is fixed and known, so the angle sensor 14 can be used to provide the azimuth of the optical axis of the visual system 11, that is, the angle between the optical axis of the visual system 11 and the horizontal plane. Therefore, when there is liquid in the observation area, the liquid surface can be considered to be equivalent to the horizontal plane, so the azimuth of the optical axis can also be understood as the angle between the optical axis of the visual system 11 and the liquid surface. .

[0031] Of course, in other embodiments, the angle providing component 14 can also be other components, such as a bracket supporting the laser rangefinder 10, and the bracket includes a clamping portion and a supporting portion for supporting the clamping portion. The visual system 11 is arranged on the clamping portion. For example, the laser rangefinder 10 also includes a shell, and the visual system 11, the laser rangefinder system 12, the refraction parameter measurement system 13 and the prompt processing component 15 are arranged on the shell. The clamping portion is used to clamp the shell, thereby achieving the fixation of the visual system 11. In some embodiments, the angle between the clamping portion and the supporting portion is fixed so that the azimuth of the optical axis of the visual system 11 is fixed to a preset azimuth, and the preset azimuth is also used as the angle between the optical axis and the liquid surface. In some other embodiments, the angle between the clamping portion and the supporting portion is variable, for example, it can be switched between multiple preset azimuths, so that the azimuth of the optical axis of the visual system 11 can be switched between multiple preset azimuths, wherein the preset azimuth currently switched to is used as the angle between the optical axis and the liquid surface.

[0032] The laser ranging system 12 includes a laser emitting system 121 and a laser receiving system 122 .

[0033] The laser emission system 121 includes a laser source 1211, a second collimating lens 1212, a third collimating lens 1213, a first beam splitter 1214 and a perforated reflector 1215. The laser source 1211 may be, but is not limited to, a blue laser source. The second collimating lens 1212 and the third collimating lens 1213 form a lens group, whereby the ranging laser emitted by the laser source 1211 forms a parallel outgoing laser through the lens group to detect the target.

[0034] Specifically, the ranging laser sent by the laser source 121 is incident on the first beam splitter 1214 after being transmitted through the second collimating lens 1212. The first beam splitter 1214 divides the incident ranging laser into a first ranging laser a and a second ranging laser b, wherein the first ranging laser a is used to detect the target, and the second ranging laser b is used as a parameter measurement laser to be emitted to the refraction parameter measurement system 13 for measuring the refraction parameter of the liquid, for details, please refer to the following description. In some implementation scenarios, the ranging laser obtained by transmission through the first beam splitter 1214 is the first ranging laser a, and the ranging laser obtained by reflection through the first beam splitter 1214 is the second ranging laser b. In addition, the first beam splitter 1214 can split the light according to a preset ratio, that is, the laser amount of the first ranging laser a and the laser amount of the second ranging laser b are the preset ratio. Generally, the laser amount of the first ranging laser a can be set to be greater than the laser amount of the second ranging laser b.

[0035] After the first beam splitter 1214 splits the first distance-measuring laser a, the first distance-measuring laser a converges at the through hole of the perforated reflector 1215, and is emitted to the third collimating lens 1213 through the through hole to form parallel outgoing laser light for detecting the target. Figure 3 , the spliced ​​lens 1213 includes a first transmission area U and a second transmission area E, the first transmission area U is located in the central area of ​​the spliced ​​lens, and the second transmission area E is located at the periphery of the first transmission area U. The ranging laser a emitted through the perforated reflector 1215 passes through the first transmission area U of the third collimating lens 1213 to form the parallel emitted laser. It should be understood that in other implementation scenarios, the first transmission area U and the second transmission area E may not be as Figure 3 The relationship shown is a nested relationship, and the two regions may also be adjacent and have no intersection, so the positional relationship between the first transmission region and the second transmission region and their shapes and sizes are limited.

[0036] The laser receiving system 122 includes a distance measuring detector 1221, and the distance measuring detector 1221 is provided with a photosensitive surface 1221a, and the photosensitive surface 1221a is used to receive the echo laser obtained by the target reflecting the parallel outgoing laser emitted by the laser emitting system 121. In this embodiment, the echo laser is transmitted to the distance measuring detector 1221 through the optical elements of the laser emitting system 121. Specifically, the echo laser is transmitted to the perforated reflector 1215 through the second transmission area E of the spliced ​​lens 1213, and is reflected by the perforated reflector 1215 and focused on the photosensitive surface 1221a of the distance measuring detector 1221.

[0037] It can be understood that the present embodiment adopts the perforated reflector 1215 to realize the transmission of the ranging laser and the echo laser. In other embodiments, a second beam splitter may also be used. The first ranging laser a is transmitted to the first transmission area U of the spliced ​​lens through the second beam splitter, and the echo laser is reflected to the photosensitive surface 1221a of the ranging detector 1221 through the second beam splitter. Of course, optical elements other than the perforated transmitting mirror and the second beam splitter may also be used, as long as the optical element can realize the transmission of the ranging laser to the first transmission area of ​​the spliced ​​lens and the echo laser to the photosensitive surface 1221a of the ranging detector 1221. In addition, in other embodiments, the laser receiving system may not reuse the optical elements in the laser transmitting system. For example, the laser receiving system 122 also includes a fourth collimating lens and a reflector. The echo laser is transmitted to the reflector through the fourth collimating lens, and then reflected to the photosensitive surface 1221a of the ranging detector 1221 through the reflector. Accordingly, since the processing of the echo laser is not considered, the third collimating lens 1213 in the laser emitting system 121 may not be set as a splicing lens, but a conventional collimating lens, and the laser emitting system 121 may not be provided with a perforated reflector 1215, or an optical component that does not require a reflection function and can transmit the ranging laser to the third collimating lens 1213 may be used.

[0038] The refraction parameter measurement system 13 measures the refraction parameters of the liquid by using the aforementioned second distance measuring laser b as a parameter measuring laser to be incident on the liquid in the medium accommodating chamber 131 . Specifically, the refraction parameter measurement system 13 also includes an optical channel 132, a parameter measurement detector 133, and a first collimating lens 134 arranged on the optical channel 132. The parameter measurement detector 133 is arranged at the bottom of the medium accommodating chamber 131. An opening 1311 is arranged at the top of the medium accommodating chamber 131. A switch part 1312 is also arranged at a position corresponding to the opening 1311. The switch part 1312 is used to open or close the opening 1311. Specifically, the switch part 1312 can be manually or electrically controlled. For example, when the refraction parameter measurement system 13 is currently required to be measured, the observer can manually open the switch part 1312, and when it is determined that the refraction parameter measurement system 13 is not required to measure, the observer manually closes the switch part 1312; or, when the refraction parameter measurement system 13 is currently required to be measured, the processing unit of the laser rangefinder controls the switch part 1312 to be opened, and when it is determined that the refraction parameter measurement system 13 is not required to measure, the processing unit of the laser rangefinder controls the switch part 1312 to be closed. When the switch part 1312 is in the open state, the second distance measuring laser b serving as the parameter measuring laser is emitted from the first beam splitter 1214 to the optical channel 132, and after passing through the first collimating lens 134 on the optical channel 132, enters the medium containing cavity 131 from the open opening 1311, and is refracted by the liquid in the medium containing cavity 131 to the parameter measuring detector 133 at the bottom.

[0039] The parameter measuring detector 133 is used to output the position of the second distance measuring laser b incident on the parameter measuring detector 133, that is, to output the response position information of the parameter measuring laser, so as to determine the refraction parameter of the liquid in the medium accommodating cavity 131. The refraction parameter can be specifically the refraction angle when the parameter measuring laser is incident on the liquid. Specifically, if the position of the detector unit corresponding to the center point of the light exit hole is known, the response position information d of the parameter measuring laser (that is, the horizontal distance from the center point of the response detector area to the center point of the light exit hole) can be calculated: , where P is the number of detector units between the center point of the response detector area and the center point of the light exit hole, and M is the distance between the centers of two adjacent detector units. The aforementioned center point of the light exit hole is the geometric center of the opening 1311, and the aforementioned center point of the response detector area is the geometric center of the detector unit corresponding to the center of the spot of the parameter measurement laser on the parameter measurement detector 133, wherein the center of the spot can be calculated using a geometric center algorithm or a centroid algorithm.

[0040] In conjunction with reference 4, when the medium accommodating chamber 131 is empty, the parameter measuring laser is emitted to the parameter measuring detector 133 through the opening 1411 to obtain the response position information d1 of the parameter measuring laser. Since the vertical height h of the medium accommodating chamber is known, the incident angle of the parameter measuring laser can be calculated based on the linear transmission characteristics of the light beam. In some embodiments, the refraction parameter measurement system 13 further includes a temperature sensor 135 disposed inside or on the outer surface of the medium accommodating chamber 131. When the temperature sensor 135 is used to determine that the temperature of the medium accommodating chamber 131 is in a fluctuating state, the incident angle It is measured by using the parameter measuring laser to enter the empty medium accommodating cavity 131 when it is determined that the parameter measuring laser does not deflect in the empty medium accommodating cavity 131. Specifically, the above processing can be performed by the processing unit of the laser rangefinder 10, that is, the processing unit of the laser rangefinder 10 monitors the temperature output by the temperature sensor 135, and when it is determined that the temperature of the medium accommodating cavity 131 is in a fluctuating state based on the temperature output by the temperature sensor 135, it is further detected whether the current parameter measuring laser is deflected in the empty medium accommodating cavity 131. If it is determined that no deflection occurs, the response position information d1 of the parameter measuring laser output by the parameter measuring detector 133 is obtained, and then the incident angle of the parameter measuring laser is calculated. Of course, when the response position information of the parameter measurement laser output by the parameter measurement detector 133 is not the horizontal distance d from the center point of the response detector area to the center point of the light exit hole, but the number P of detector units between the center point of the response detector area and the center point of the light exit hole, the processing unit can further calculate d1 based on the current output P of the parameter measurement detector 133, and then calculate the incident angle of the parameter measurement laser .

[0041] Continue reading Figure 4 When the medium accommodating cavity is filled, that is, when liquid is placed, the parameter measurement laser will be refracted after entering the opening 1311, and the response position information d2 of the parameter measurement laser output by the parameter measurement detector 133 is obtained. Since the vertical height h of the medium accommodating cavity is known, the refraction angle of the parameter measurement laser can be calculated. , as the refraction parameter of the liquid. According to the law of refraction, ,in is the refractive index of air, is the refractive index of the filled liquid. So we can get the refractive index of the liquid Similarly, specifically, the above calculation process can be performed by a processing unit of the laser rangefinder.

[0042] It can be understood that in this embodiment, the distance measuring laser of the multiplexed laser distance measuring system 12 is used as the parameter measuring laser used by the above-mentioned refraction parameter measuring system 13. In other embodiments, another laser source can be separately set for the refraction parameter measuring system 13 to specifically emit the parameter measuring laser. In this case, the parameter measuring laser and the distance measuring laser used by the laser distance measuring system 12 are the same type of lasers, such as blue light lasers. In addition, since the distance measuring laser of the laser distance measuring system 12 does not need to be separated as the parameter measuring laser, the laser emitting system 121 may not be provided with the first beam splitter 1214.

[0043] The prompt processing component 15 specifically includes a processing unit (not shown) and a prompt component 151. In this embodiment, the processing unit is connected to the parameter measuring detector 133 and the angle sensor 14 of the refraction parameter measurement system, thereby receiving the response position information of the ranging laser output by the parameter measuring detector 133 and the angle output by the angle sensor 14. , and calculate based on the above received data to obtain the orientation information of the target in the liquid. For example, according to the complementary relationship, the corresponding incident angle of the target in the liquid currently observed by the observer can be obtained as Based on the response position information, the refractive index of the liquid is determined , and then according to the law of refraction, ,in is the refractive index of air, is the refractive index of the liquid where the target is located, and the refractive angle corresponding to the target in the liquid currently observed by the observer is calculated , the refraction angle can be As the azimuth of the target and prompt, or, depending on the definition of the target's azimuth, based on the refraction angle Calculate the target's azimuth (e.g., subtract 90° from The difference is used as the azimuth of the target) and a prompt is given. It can be understood that the processing unit of the laser rangefinder mentioned above can be the same processing unit as the processing unit in the prompt processing component 15. The prompt component 151 is at least one of a display screen and a speaker, so that visual or auditory prompts can be achieved. In this embodiment, the prompt component 151 is a display screen 151, which is used to display electronic information. In order to facilitate the observer to view, the display screen 151 is arranged on the object focus of the eyepiece 111 in the visual system 11, so that the observer can view the prompt information while observing the target.

[0044] In some specific application scenarios, the aforementioned laser rangefinder 10 may be, but is not limited to, a handheld rangefinder.

[0045] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A laser rangefinder, characterized in that: The laser rangefinder is a handheld rangefinder, and the laser rangefinder comprises: Visual system, used to provide users with objects to observe; A laser ranging system, used for measuring the distance to the target; A refraction parameter measurement system is provided with a medium accommodating chamber, and the refraction parameter measurement system is used to measure the refraction parameter of the liquid in the medium accommodating chamber; Angle provides components; and, Prompt processing component; When the user observes a target in the liquid through the visual system, the angle providing component is used to provide the angle between the optical axis of the visual system and the liquid surface, and the refraction parameter measuring system is used to measure the refraction parameter of the liquid. The prompt processing component is used to determine the orientation information of the target in the liquid based on the angle and the refraction parameter, and the orientation information is prompted.

2. The laser rangefinder according to claim 1, characterized in that: The refraction parameter measurement system further comprises an optical channel and a parameter measurement detector, wherein the parameter measurement detector is arranged at the bottom of the medium accommodating cavity, and an opening is arranged at the top of the medium accommodating cavity; Among them, the parameter measuring laser is incident on the medium containing cavity from the opening through the optical channel, and is refracted by the liquid in the medium containing cavity to the parameter measuring detector at the bottom. The parameter measuring detector is used to output the response position information of the parameter measuring laser, so as to determine the refraction parameters of the liquid in the medium containing cavity. The parameter measuring laser is the same type of laser as the ranging laser used in the laser ranging system.

3. The laser rangefinder according to claim 2, characterized in that: The parameter measuring detector is a codable detector; And / or, a switch portion is provided at a position on the top of the medium accommodating cavity corresponding to the opening, and the switch portion is used to open or close the opening.

4. The laser rangefinder according to claim 2, characterized in that: The laser ranging system includes a laser emitting system, which includes a laser source and a first spectroscope. The refraction parameter measurement system also includes a first collimating lens, which is located on the optical channel. The ranging laser emitted by the laser source is divided into a first ranging laser and a second ranging laser by the first spectroscope. The first ranging laser is used to detect targets, and the second ranging laser is used as the parameter measurement laser.

5. The laser rangefinder according to claim 4, characterized in that: The laser amount of the first distance measuring laser is greater than the laser amount of the second distance measuring laser; and / or, the first distance measuring laser is obtained by transmission of the first beam splitter, and the second distance measuring laser is obtained by reflection of the first beam splitter.

6. The laser rangefinder according to claim 1, characterized in that: The refraction parameter of the liquid is measured by using a parameter measuring laser to pass through the liquid in the medium containing cavity, and the refraction parameter is the refraction angle when the parameter measuring laser is incident on the liquid. The prompt processing component is used to determine the refractive index of the liquid based on the refraction angle and the incident angle when the parameter measuring laser is incident on the liquid, determine the azimuth of the target located in the liquid based on the included angle and the refractive index, and prompt the azimuth, wherein the incident angle is measured by using the parameter measuring laser to be incident on the empty medium containing cavity.

7. The laser rangefinder according to claim 6, characterized in that: The refraction parameter measurement system further includes a temperature sensor disposed inside or on the outer surface of the medium accommodating cavity; In the case where the temperature sensor is used to determine that the temperature of the medium accommodating cavity is in a fluctuating state, the incident angle is measured when the parameter measuring laser is not deflected in the empty medium accommodating cavity.

8. The laser rangefinder according to claim 1, characterized in that: The angle providing component is an angle sensor, the positional relationship between the angle sensor and the optical axis of the visual system is fixed, and the angle sensor is used to detect the azimuth of the optical axis as the angle between the optical axis and the liquid surface; Alternatively, the angle providing component is a bracket, which includes a clamping portion and a supporting portion for supporting the clamping portion, and the visual system is arranged on the clamping portion, wherein the angle between the clamping portion and the supporting portion is fixed so that the azimuth angle of the optical axis of the visual system is fixed to a preset azimuth angle, or the angle between the clamping portion and the supporting portion is variable so that the azimuth angle of the optical axis of the visual system can be switched between multiple preset azimuth angles, wherein the preset azimuth angle is used as the angle between the optical axis and the liquid surface.

9. The laser rangefinder according to claim 1, characterized in that: The visual system comprises an objective lens, an eyepiece and an image-transmitting prism, wherein the image-transmitting prism is arranged between the objective lens and the eyepiece; The prompt processing component includes a display screen, and the display screen is arranged on the object focus of the eyepiece.

10. The laser rangefinder according to claim 1, characterized in that: The laser ranging system comprises: A laser emission system, the laser emission system comprising a laser source and a lens group, wherein the ranging laser emitted by the laser source is transformed into parallel outgoing laser through the lens group to detect the target; A laser receiving system, wherein the laser receiving system comprises a distance measuring detector, wherein the distance measuring detector is provided with a photosensitive surface, and the photosensitive surface is used to receive the echo laser reflected by the target from the parallel outgoing laser.

11. The laser rangefinder according to claim 10, characterized in that: The lens group includes a second collimating lens and a third collimating lens, wherein: The laser emission system further comprises a first beam splitter, which is arranged between the second collimating lens and the third collimating lens, the ranging laser emitted by the laser source is incident on the first beam splitter via the second collimating lens, the first beam splitter separates a first path of ranging laser from the incident ranging laser, and the first path of ranging laser forms the parallel output laser via the third collimating lens; and / or, The distance measuring system further includes an optical element arranged between the second collimating lens and the third collimating lens, wherein the third collimating lens is a splicing lens, including a first transmission area and a second transmission area, and at least part of the distance measuring laser passing through the second collimating lens is emitted to the first transmission area of ​​the splicing lens through the optical element, and the echo laser is transmitted to the optical element after passing through the second transmission area of ​​the splicing lens, and is emitted to the distance measuring detector through the optical element; wherein the optical element is a perforated reflector, and the distance measuring laser is emitted to the splicing lens through the perforations in the perforated reflector, and the echo laser is reflected to the distance measuring detector through the perforated reflector; or, the optical element is a second beam splitter, and the distance measuring laser is transmitted to the splicing lens through the second beam splitter, and the echo laser is reflected to the distance measuring detector through the second beam splitter.

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