CN212460045U - Distance measuring instrument - Google Patents
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- CN212460045U CN212460045U CN202021584638.1U CN202021584638U CN212460045U CN 212460045 U CN212460045 U CN 212460045U CN 202021584638 U CN202021584638 U CN 202021584638U CN 212460045 U CN212460045 U CN 212460045U
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Abstract
The application provides a distance measuring instrument, this distance measuring instrument includes: signal processing module, first optic fibre, second optic fibre and distance measurement module, signal processing module includes: the system comprises a first light source, a first optical signal processing unit and a human-computer interaction unit; the distance measuring module includes: an optical signal transmitting unit, an optical signal receiving unit; the first light source and the optical signal transmitting unit are connected through a first optical fiber, and the first optical signal processing unit and the optical signal receiving unit are connected through a second optical fiber. The technical scheme disclosed in the application can separate the light path part and the circuit part of the laser range finder, enlarges the application scene and the application range of the laser range finder, and improves the safety of the laser range finder in the using process.
Description
Technical Field
The present application relates generally to a distance measuring instrument, and more particularly to a laser distance measuring instrument having a signal processing part and a measuring part separated from each other.
Background
Laser rangefinders (Laser rangefinders) are instruments that use parameters of modulated Laser light to achieve distance measurement to a target. The measuring range of the laser range finder is generally 3.5-5000 meters. The laser range finder is divided into a phase method range finder and a pulse method range finder according to a range finding method, wherein the pulse method range finder emits a beam or a sequence of short pulse laser beams to a target when working, a photoelectric element receives the laser beams reflected by the target, a timer measures the time from the emission to the reception of the laser beams, and the distance from an observer to the target is calculated. The phase-method distance meter detects a distance by detecting a phase difference occurring when emitted light and reflected light propagate in a space. The laser range finder has the advantages of light weight, small volume, simple operation, high speed and accuracy, the error of the laser range finder is only one fifth to one hundred times of that of other optical range finders, and the laser range finder is widely applied to the fields of industrial measurement and control, mines, ports and the like due to various advantages of the laser range finder.
However, in some extreme temperature or explosion-proof environments, the use of the laser range finder is limited, and the temperature-resistant range of the electronic devices of the circuit in the laser range finder is relatively small, so that the error of the measurement result of the laser range finder is relatively large under the conditions of high temperature or low temperature. Moreover, since the electronic device works with electricity, in some explosion-proof scenes, the weak power may also cause risks such as explosion.
How to expand the application range of the laser range finder as much as possible under the condition of ensuring the measurement precision and the use safety of the laser range finder is a difficult problem in the field of current laser range finding.
Disclosure of Invention
In view of the shortcomings of the prior art, the present application provides a distance measuring instrument, which improves many problems existing in the prior art, and comprises the following contents:
according to an aspect of the present disclosure, there is provided a distance measuring instrument including: signal processing module, first optic fibre, second optic fibre and distance measurement module, signal processing module includes: the system comprises a first light source, a first optical signal processing unit and an optional human-computer interaction unit; the distance measuring module includes: an optical signal transmitting unit, an optical signal receiving unit; the first light source and the optical signal transmitting unit are connected through a first optical fiber, and the first optical signal processing unit and the optical signal receiving unit are connected through a second optical fiber.
In an exemplary embodiment of the present disclosure, the lengths of the first optical fiber and the second optical fiber are each independently greater than a predetermined length, such as greater than 1 meter, greater than 2 meters, greater than 3 meters, greater than 10 meters, greater than 100 meters, or greater than 1000 meters, such as greater than or equal to 0.9 meters, greater than or equal to 2.1 meters, greater than or equal to 3.1 meters, greater than or equal to 10.1 meters, greater than or equal to 101 meters, greater than or equal to 501 meters, or greater than or equal to 1001 meters.
In an exemplary embodiment of the present disclosure, the optical signal transmitting unit has a light transmitting opening, the optical signal receiving unit has a light receiving opening, and the light transmitting opening and the light receiving opening are coaxially disposed.
In an exemplary embodiment of the present disclosure, further comprising: a third optical fiber, the signal processing module, further comprising: a second light source, wherein a receiving splitter is disposed on the second optical fiber, the third optical fiber connects an entrance end of the receiving splitter and the second light source, and the length of the third optical fiber is:
L3＝L1+L2f
wherein L is3Is a third fiber length, L1Is a first fiber length, L2fThe length between the receiving splitter and the light receiving port on the second optical fiber. The meaning of the above formula is that the length of the third optical fiber is such that the distance that the optical signal emitted by the second light source travels in the optical fiber through the third optical fiber is the same as the distance that the light of the first light source travels in the optical fiber through the optical signal receiving unit. It should be understood that the terms equal in length or equal in distance and the like as used herein do not refer to the absolute equal lengths or the absolute equal distances of the optical fibers, but refer to the fact that the difference in length between the optical fibers does not significantly affect the results of the distance measurement, or the difference in propagation distance does not significantly affect the results of the distance measurement.
In an exemplary embodiment of the present disclosure, further comprising: a fourth optical fiber; the signal processing module further comprises: a second optical signal processing unit, wherein a launch splitter is disposed on the first optical fiber, the fourth optical fiber connects an outlet end of the launch splitter and the second optical signal processing unit, and the length of the fourth optical fiber is:
L4＝L2+L1f
wherein L is4Is a fourth fiber length, L2Is the second fiber length, L1fThe length between the launch splitter and the light launch port on the first fiber. The meaning of the above formula is that the length of the fourth optical fiber is such that the distance that the optical signal emitted by the first light source travels in the optical fiber through the fourth optical fiber is the same as the distance that the optical signal of the first light source travels in the optical fiber when it reaches the first optical signal processing unit through the optical signal receiving unit.
In an exemplary embodiment of the present disclosure, further comprising: a fifth optical fiber, wherein the first light source is a narrow pulse wave signal, a receiving splitter is disposed on the second optical fiber, a transmitting splitter is disposed on the first optical fiber, and an outlet of the transmitting splitter is connected to an inlet of the receiving splitter through the fifth optical fiber, wherein the length of the fifth optical fiber is:
L5＝L2f+L1f；
wherein L is5Is a fifth fiber length, L2fThe length between the receiving splitter and the light receiving port on the second optical fiber, L1fThe length between the launch splitter and the light launch port on the first fiber. The meaning of the above formula is that the length of the fifth optical fiber is the same as the distance that the optical signal of the first light source travels in the optical fiber when the optical signal emitted by the first light source reaches the first optical signal processing unit through the fifth optical fiber and the distance that the optical signal of the first light source travels in the optical fiber when the optical signal reaches the first optical signal processing unit through the optical signal receiving unit.
In an exemplary embodiment of the present disclosure, the distance measuring module includes: and the light emission collimator is used for processing the optical signal from the first light source into parallel light and emitting the parallel light to a measured object by the optical signal emitting unit.
In an exemplary embodiment of the present disclosure, the distance measuring module includes: and the light receiving collimating mirror is used for processing the light signal reflected by the object to be measured into parallel light to be received by the second optical fiber.
In an exemplary embodiment of the present disclosure, the first light source is a laser light source.
In an exemplary embodiment of the present disclosure, the distance measurement module does not contain a circuit.
According to the technical scheme, the signal processing module and the distance measuring module are separately designed, the first light source in the signal processing module and the optical signal transmitting unit in the distance measuring module are connected through the first optical fiber, and the first optical signal processing unit in the signal processing module and the optical signal receiving unit in the distance measuring module are connected through the second optical fiber, so that the following technical effects are achieved: the application scene and the application range of the laser range finder are enlarged, and the safety of the laser range finder in the using process is improved. The solution according to the present application also brings numerous other advantages, which will be explained in detail in the detailed description.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.
FIG. 1 is a schematic view of a distance measuring instrument according to an exemplary embodiment;
FIG. 2 is a schematic view of a distance measuring instrument according to another exemplary embodiment;
FIG. 3 is a schematic view of a distance measuring instrument according to another exemplary embodiment;
fig. 4 is a schematic view of a distance measuring device according to another exemplary embodiment.
Reference numerals:
10-a signal processing module, 20-a distance measuring module, 30-a first optical fiber,
40-second fiber, 50-third fiber, 60-fourth fiber, 70-fifth fiber,
120-a first light source, 130-a second light source, 140-a first optical signal processing unit,
150-a second optical signal processing unit, 160-a human-computer interaction unit,
220-optical signal emitting unit, 222-optical emission port, 224-optical emission collimator,
226-transmitting splitter, 240-optical signal receiving unit, 242-optical receiving port,
244-light receiving collimating mirror, 246-receiving splitter
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Furthermore, the described features, structures, or characteristics of the disclosure may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
It will be understood that, although the terms first, second, third, etc. may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the present application, each term has a meaning generally understood in the art, unless otherwise indicated or a different meaning can be derived from the context.
The optical fiber is a shorthand optical fiber, for example, a fiber made of glass or plastic, which can be used as a light conducting tool, and the optical fiber can realize total reflection of light. It should be understood that when equal relationships are described in the present application for the lengths of the optical fibers, it does not mean that the lengths of the optical fibers are absolutely equal, but rather that the difference in length between the optical fibers does not significantly affect the results of the distance measurement.
Wherein the collimating optic has a meaning commonly understood by those skilled in the art to change the divergent light path into a parallel light path.
The splitter, specifically an optical fiber splitter, also called an optical fiber combiner, is a device for splitting and combining light wave energy. The optical energy transmitted in one optical fiber is distributed to two or more optical fibers according to a set proportion, or the optical energy transmitted in the optical fibers is synthesized into one optical fiber, and the combiner can be also called a combiner when combining multiple optical signals into one signal. The splitter can be divided into a fused biconical taper type and a planar waveguide type according to the principle, and the fused biconical taper type product is formed by welding two or more optical fibers at the side surface; the planar waveguide type is a micro-optical element type product, and adopts the photoetching technology to form an optical waveguide on a medium or a semiconductor substrate so as to realize the branch distribution function. The generation process of the splitter in the present disclosure may be either or both of a fused-tapered type and a planar waveguide type in combination.
The pulse wave is an electric signal which is discontinuous and has extremely short duration and suddenly occurs, all voltages or currents which are discontinuous can be called pulse voltage or pulse current, the pulse wave can also be a square wave, the square wave refers to a signal with a duty ratio of 50%, and the narrow pulse wave refers to a square wave signal with a duty ratio of less than 50%.
The ranges or technical features described in the present application may be used alone or in combination. The present application can be more easily understood by the following examples. The internal structure and specific operation details of the distance measuring instrument are described in detail below with reference to specific embodiments.
Example 1
Fig. 1 is a schematic view of a distance measuring device according to an exemplary embodiment. Referring to fig. 1, the distance measuring instrument 1 includes: the device comprises a signal processing module 10, a distance measuring module 20, a first optical fiber 30 and a second optical fiber 40.
The signal processing module 10 may include: the first light source 120, the first optical signal processing unit 140, and the signal processing module 10 may further include: the man-machine interaction unit 160, the man-machine interaction unit 160 can be connected with the first light source 120 and the first optical signal processing unit 140 through electrical signals.
Among them, the distance measuring module 20 may include: an optical signal transmitting unit 220, and an optical signal receiving unit 240. Further, the optical signal transmitting unit 220 may include: a light emitting port 222 and a light emitting collimator 224. Further, the optical signal receiving unit 240 may include: a light receiving opening 242 and a light receiving collimator 244. The distance measuring module 20 may not include a circuit, which can increase the safety in the measurement. Certainly, the distance measuring module 20 may also include a passive device, and the passive device does not introduce an electrical signal and can also ensure safety during the measuring process.
Therein, the first light source 120 and the optical signal transmitting unit 220 are connected by the first optical fiber 30 to transmit the optical signal transmitted by the first light source 120 to the transmitting unit 1202 via the first optical fiber 30. The first optical signal processing unit 140 and the optical signal receiving unit 240 are connected by a second optical fiber 40 to transmit the optical signal received by the optical signal receiving unit 240 to the first optical signal processing unit 140 via the second optical fiber 40. It is worth mentioning that the lengths of the first optical fiber 30 and the second optical fiber 40 can be respectively and independently greater than the preset length, and the preset length can be 1 meter, 5 meters, 50 meters, 100 meters, 500 meters, 1000 meters or any other length. The length of the optical fiber is limited only by the practical use requirements and the length that can be achieved in technical implementation.
The optical signal emitted by the first light source 120 may be a laser signal, the laser emitted by the laser emits light in one direction, the divergence of the light beam is extremely small and is close to parallel, and the optical signal is an ideal measuring light source.
Preferably, the first optical fiber 30 and the second optical fiber 40 have equal lengths, but in practical application scenarios, the first optical fiber 30 and the second optical fiber 40 with different lengths may be selected according to specific environments, and the disclosure is not limited thereto. Further, the lengths of the first optical fiber 30 and the second optical fiber 40 may be recorded in the first optical signal processing unit 140 so as to eliminate measurement errors caused by the lengths of the first optical fiber 30 and the second optical fiber 40 in subsequent calculations.
Preferably, light-emitting opening 222 and light-receiving opening 242 are coaxially arranged, and such a design can avoid a distance error caused by an offset between light-emitting opening 222 and light-receiving opening 242, which is larger at shorter measurement distances. The specific manner of coaxial arrangement is not limited, and a specific manner is shown in the drawings, and those skilled in the art can arrange different coaxial arrangement schemes according to actual needs. However, in practical application scenarios, due to different production processes and manufacturing costs, the light-emitting opening 222 and the light-receiving opening 242 may not be designed coaxially, and may be disposed side by side or at other angles, which are all within the scope of the present application. Further, the light-emitting opening 222 and the light-receiving opening 242 may be disposed at positions that do not affect the emission of the light signal nor the reception of the light signal. In the subsequent distance calculation process, the deviation between the light emitting opening 222 and the light receiving opening 242 can be obtained according to the geometric calculation based on the distance between the light emitting opening 222 and the light receiving opening 242, and then the deviation is removed in the subsequent calculation of the distance between the measured object and the distance measuring module 20, so that the actual distance is obtained.
In one embodiment, the human-computer interaction unit 160 in the signal processing module 10 may set a specific measurement parameter and then transmit the set parameter to the first light source 120, and the first light source 120 transmits the light signal according to the set parameter after receiving the measurement command of the human-computer interaction unit 160. The optical signal is transmitted to the optical signal transmitting unit 220 in the distance measuring module 20 through the first optical fiber 30. The optical signal transmitting unit 220 receives an optical signal through the light receiving opening 242, and then processes the optical signal of the first light source 120 into parallel light through the light emitting collimator lens 224 and transmits the parallel light to the object to be measured.
In one embodiment, after the optical signal of the first light source 120 is transmitted to the object to be measured and reflected by the object to be measured, a reflected optical signal is generated, and the reflected optical signal is received by the optical signal receiving unit 240 in the distance measuring module 20, more specifically, the optical receiving collimator 244 in the optical signal receiving unit 240 receives the object reflected optical signal, the optical receiving collimator 244 may process the optical signal reflected by the object to be measured into parallel light to be received by the second optical fiber 40, and after the second optical fiber 40 receives the transmitted optical signal, the optical signal is transmitted to the first optical signal processing unit 140, and in the first optical signal processing unit 140, the reflected optical signal may be calculated to obtain the distance between the object to be measured and the distance measuring module 20.
In one embodiment, the reflected light signal may be calculated by a TOF time-of-flight algorithm or a phase algorithm to obtain the distance between the object being measured and the distance measurement module 20. In this case, an internal optical fiber directly from the light source to the optical signal processing unit on the signal processing module 10 may be provided to facilitate calculation of the distance. Arrangements not mentioned in the present application may refer to other patent applications of the applicant, such as the arrangements of internal optical paths and the design of specific circuits mentioned in documents CN109917415A and CN101799536B, which are incorporated by reference into the present application as part of the present application.
Tof (time of flight) is to obtain the distance to a target object by continuously sending light pulses to the target, receiving the light returning from the object by a light receiving collimator, and detecting the flight (round trip) time of the light pulses.
Wherein, the phase algorithm is used for detecting the distance by detecting the phase difference generated when the emitted light and the reflected light propagate in the space. More specifically, in the phase measurement of laser light, a continuously emitted optical signal is amplitude-modulated, the light intensity of the modulated light periodically changes with time, and the distance to the target object can be determined by measuring the phase change that the modulated light has passed in the reciprocating process.
In some embodiments, the reflected light signal may be calculated by other laser ranging algorithms to obtain the distance between the measured object and the distance measuring module 20, which is not limited in this disclosure.
Example 2
Fig. 2 is a schematic view of a distance measuring device according to another exemplary embodiment. Referring to fig. 2, the distance measuring instrument 2 includes: the device comprises a signal processing module 10, a distance measuring module 20, a first optical fiber 30, a second optical fiber 40 and a third optical fiber 50.
The signal processing module 10 may include: the first light source 120, the second light source 130, the first optical signal processing unit 140, and the signal processing module 10 may further include: the man-machine interaction unit 160, the man-machine interaction unit 160 can be connected with the first light source 120, the second light source 130, and the first optical signal processing unit 140 through electrical signals.
Among them, the distance measuring module 20 may include: an optical signal transmitting unit 220, and an optical signal receiving unit 240. Further, the optical signal transmitting unit 220 may include: a light emitting port 222 and a light emitting collimator 224. Further, the optical signal receiving unit 240 may include: a light receiving port 242, a light receiving collimator 244, and a receiving splitter 246 having two interfaces. The distance measuring module 20 may not include a circuit, and the distance measuring module may include a passive device.
Wherein, the first light source 120 and the optical signal transmitting unit 220 are connected by the first optical fiber 30 to transmit the optical signal transmitted by the first light source 120 to the optical signal transmitting unit 220 via the first optical fiber 30. The second light source 130 and the optical signal receiving unit 240 are connected by a third optical fiber 50 to transmit the optical signal emitted from the second light source 130 to the optical signal receiving unit 240 via the third optical fiber 50, and more specifically, the optical signal emitted from the second light source 130 is transmitted into the receiving splitter 246 via the third optical fiber 50. The first optical signal processing unit 140 and the optical signal receiving unit 240 are connected by a second optical fiber 40 to transmit the optical signal received by the optical signal receiving unit 240 to the first optical signal processing unit 140 via the second optical fiber 40.
It is worth mentioning that the lengths of the first optical fiber 30 and the second optical fiber 40 can be respectively and independently greater than the preset length, and the preset length can be 1 meter, 5 meters, 50 meters, 100 meters, 500 meters, 1000 meters or any other length. The length of the optical fiber is limited only by the practical need and the length that can be achieved in technical implementation. The length of the third optical fiber 50 is determined by the length of the first optical fiber 30 and the length between the receiving splitter 246 and the light receiving opening 242 of the second optical fiber 40.
In one embodiment, the length of the third optical fiber 50 is:
L3＝L1+L2f
wherein L is3Is a third fiber length, L1Is a first fiber length, L2fThe length between the receiving splitter and the light receiving port on the second optical fiber.
The length of the third optical fiber 50 calculated by the above formula can make the distance that the optical signal emitted by the second light source 130 propagates in the optical fiber through the third optical fiber 50 be the same as the distance that the light of the first light source 120 propagates in the optical fiber through the optical signal receiving unit 240, and this arrangement can better offset the influence of the lengths of the first optical fiber 30 and the second optical fiber 40 on the test result of the distance measurement in the subsequent distance calculation.
The optical signals emitted by the first light source 120 and the second light source 130 may be laser signals.
Preferably, light-emitting opening 222 and light-receiving opening 242 are coaxially arranged, and such a design can avoid a distance error caused by an offset between light-emitting opening 222 and light-receiving opening 242, which is larger at shorter measurement distances. However, in an actual application scenario, the light emitting port 222 and the light receiving port 242 may not be coaxially disposed, and when the distance between the object to be measured and the distance measuring module 20 is calculated subsequently, the deviation caused by the non-coaxial design of the light emitting port 222 and the light receiving port 242 can be eliminated.
In one embodiment, the human-computer interaction unit 160 in the signal processing module 10 may set a specific measurement parameter and then transmit the set parameter to the first light source 120 and the second light source 130, and the first light source 120 and the second light source 130 transmit the light signal according to the set parameter after receiving the measurement command of the human-computer interaction unit 160. The optical signal is transmitted to the optical signal transmitting unit 220 in the distance measuring module 20 through the first optical fiber 30; the optical signal is also transmitted to the optical signal receiving unit 240 in the distance measuring module 20 through the third optical fiber 50, and more particularly, the optical signal is transmitted to the receiving splitter 246 in the distance measuring module 20 through the third optical fiber 50. The optical signal transmitting unit 220 receives an optical signal through the light receiving opening 242, and then processes the optical signal of the first light source 120 into parallel light through the light emitting collimator lens 224 and transmits the parallel light to the object to be measured.
In one embodiment, after the optical signal of the first optical source 120 is transmitted to the object to be measured, the optical signal is reflected by the object to be measured to generate a reflected optical signal, and the reflected optical signal is received by the optical signal receiving unit 240 in the distance measuring module 20, more specifically, the optical receiving collimator 244 in the optical signal receiving unit 240 receives the object reflected optical signal, and the optical receiving collimator 244 may process the optical signal reflected by the object to be measured into parallel light to be received by the receiving splitter 246 in the second optical fiber 40; the receiving splitter 246 transmits the received optical signal reflected by the object to be measured and the optical signal transmitted by the third optical fiber 50 to the second optical fiber 40, the second optical fiber 40 transmits the optical signal to the first optical signal processing unit 140, and the first optical signal processing unit 140 can calculate the reflected optical signal to obtain the distance between the object to be measured and the distance measuring module 20.
In one embodiment, the reflected light signal may be calculated by a TOF time-of-flight algorithm or a phase algorithm to obtain the distance between the object being measured and the distance measurement module 20. The specific algorithm is described above.
Before calculating the distance between the object to be measured and the distance measuring module 20, the length of the third optical fiber may be first subtracted from the acquired optical signal, and then the calculation is performed through a tof (time of flight) algorithm and a phase algorithm, where the third optical fiber may also be referred to as a return-to-zero optical fiber, and the distance between the object to be measured and the distance measuring module 20 may be acquired more quickly through the introduction of the third optical fiber.
In some embodiments, the reflected light signal may be calculated by other laser ranging algorithms to obtain the distance between the measured object and the distance measuring module 20, which is not limited in this disclosure.
Example 3
Fig. 3 is a schematic illustration of a distance measuring device according to another exemplary embodiment. Referring to fig. 3, the distance measuring instrument 3 includes: the device comprises a signal processing module 10, a distance measuring module 20, a first optical fiber 30, a second optical fiber 40 and a fourth optical fiber 60.
The signal processing module 10 may include: the first light source 120, the first optical signal processing unit 140, and the second optical signal processing unit 150, the signal processing module 10 may further include: the man-machine interaction unit 160, the man-machine interaction unit 160 can be connected with the first light source 120, the first optical signal processing unit 140, and the second optical signal processing unit 150 through electrical signals.
Among them, the distance measuring module 20 may include: an optical signal transmitting unit 220, and an optical signal receiving unit 240. Further, the optical signal transmitting unit 220 may include: a light emission port 222, a light emission collimator 224, and a transmission splitter 226 having two interfaces. Further, the optical signal receiving unit 240 may include: a light receiving opening 242 and a light receiving collimator 244. The distance measuring module 20 may include no circuit or only passive devices.
Here, the first light source 120 and the optical signal transmitting unit 220 are connected through the first optical fiber 30 to transmit the optical signal emitted by the first light source 120 to the optical signal transmitting unit 220 via the first optical fiber 30, and more specifically, the optical signal emitted by the first light source 120 is transmitted to the transmitting splitter 226 in the optical signal transmitting unit 220 via the first optical fiber 30, and is output from two interfaces of the transmitting splitter 226 respectively. The first optical signal processing unit 140 and the optical signal receiving unit 240 are connected by a second optical fiber 40 to transmit the optical signal received by the optical signal receiving unit 240 to the first optical signal processing unit 140 via the second optical fiber 40. The second optical signal processing unit 150 is connected to one port of the transmission splitter 226 in the optical signal transmission unit 220 to transmit the optical signal transmitted in the optical signal transmission unit 220 to the second optical signal processing unit 150 through the fourth optical fiber 60.
It is worth mentioning that the lengths of the first optical fiber 30 and the second optical fiber 40 can be respectively and independently greater than the preset length, and the preset length can be 1 meter, 5 meters, 50 meters, 100 meters, 500 meters, 1000 meters or any other length. The length of the optical fiber is limited only by the practical need and the length that can be achieved in technical implementation. The length of the fourth optical fiber 60 is determined by the length of the second optical fiber 40 and the length between the transmission splitter 226 and the light-receiving port 242 of the first optical fiber 30.
In one embodiment, the length of the fourth optical fiber is:
L4＝L2+L1f
wherein L is4Is a fourth fiber length, L2Is the second fiber length, L1fThe length between the launch splitter and the light launch port on the first fiber.
The length of the fourth optical fiber 60 calculated by the above formula can make the distance traveled by the optical signal emitted by the first light source 120 through the fourth optical fiber 60 in the optical fiber be the same as the distance traveled by the optical signal of the first light source 120 through the optical signal receiving unit 240 to the first optical signal processing unit 140, and this arrangement can more quickly cancel the influence of the lengths of the first optical fiber 30 and the second optical fiber 40 on the test result of the distance measurement in the subsequent distance calculation.
The optical signal emitted by the first light source 120 may be a laser signal.
Preferably, the light emitting opening 222 and the light receiving opening 242 are coaxially arranged, but in an actual application scenario, the light emitting opening 222 and the light receiving opening 242 may not be coaxially arranged, and when the distance between the measured object and the distance measuring module 20 is subsequently calculated, the deviation caused by the different axial designs of the light emitting opening 222 and the light receiving opening 242 can be eliminated.
In one embodiment, the human-computer interaction unit 160 in the signal processing module 10 may set a specific measurement parameter and then transmit the set parameter to the first light source 120, and the first light source 120 transmits the light signal according to the set parameter after receiving the measurement command of the human-computer interaction unit 160. The optical signal is transmitted to the launch splitter 226 in the distance measurement module 20 via the first optical fiber 30; the optical signal is split into two paths of optical signals after passing through the transmitting splitter 226, one path of optical signal is transmitted to the light-emitting collimator 224 through the light-emitting port 222, and then the optical signal processes the optical signal of the first light source 120 into parallel light through the light-emitting collimator 224 and is transmitted to the object to be measured; the other optical signal is transmitted to the second optical signal processing unit 150 via the fourth optical fiber 60.
In one embodiment, after the optical signal of the first light source 120 is emitted to the object to be measured, it is reflected by the object to be measured to generate a reflected optical signal, and the reflected optical signal is received by the optical signal receiving unit 240 in the distance measuring module 20, more specifically, the optical receiving collimator 244 in the optical signal receiving unit 240 receives the object reflected optical signal, and the optical receiving collimator 244 may process the optical signal reflected by the object to be measured into parallel light to be received by the second optical fiber 40; the second optical fiber 40 transmits the received optical signal reflected by the object to be measured to the first optical signal processing unit 140, and calculates two optical signals in the first optical signal processing unit 140 and the second optical signal processing unit 150 to obtain the distance between the object to be measured and the distance measuring module 20.
In one embodiment, the reflected light signal may be calculated by a TOF time-of-flight algorithm or a phase algorithm to obtain the distance between the object being measured and the distance measurement module 20. The specific algorithm is described above. The fourth optical fiber is also a return-to-zero optical fiber, and the distance between the object to be measured and the distance measuring module 20 can be acquired more quickly through the introduction of the fourth optical fiber.
In some embodiments, the reflected light signal may be calculated by other laser ranging algorithms to obtain the distance between the measured object and the distance measuring module 20, which is not limited in this disclosure.
Example 4
Fig. 4 is a schematic view of a distance measuring device according to another exemplary embodiment. Referring to fig. 4, the distance measuring instrument 4 includes: a signal processing module 10, a distance measuring module 20, a first optical fiber 30, a second optical fiber 40, and a fifth optical fiber 70.
The signal processing module 10 may include: the first light source 120, the first optical signal processing unit 140, and the signal processing module 10 may further include: the man-machine interaction unit 160, the man-machine interaction unit 160 can be connected with the first light source 120 and the first optical signal processing unit 140 through electrical signals.
Among them, the distance measuring module 20 may include: an optical signal transmitting unit 220, and an optical signal receiving unit 240. Further, the optical signal transmitting unit 220 may include: a light emission port 222, a light emission collimator 224, and a transmission splitter 226 having two interfaces. Further, the optical signal receiving unit 240 may include: a light receiving port 242, a light receiving collimator 244, and a receiving splitter 246 having two interfaces. The distance measurement module 20 may contain no circuitry or only passive devices.
Here, the first light source 120 and the optical signal transmitting unit 220 are connected through the first optical fiber 30 to transmit the optical signal emitted by the first light source 120 to the optical signal transmitting unit 220 via the first optical fiber 30, and more specifically, the optical signal emitted by the first light source 120 is transmitted to the transmitting splitter 226 in the optical signal transmitting unit 220 via the first optical fiber 30, and is output from two interfaces of the transmitting splitter 226 respectively. The first optical signal processing unit 140 and the optical signal receiving unit 240 are connected by the second optical fiber 40 to transmit the optical signal received by the optical signal receiving unit 240 to the first optical signal processing unit 140 via the second optical fiber 40, and more specifically, the optical signal received by the optical signal receiving unit 240 is received via one port in the reception splitter 246 and then transmitted to the first optical signal processing unit 140 via the second optical fiber 40. One interface of the transmitting splitter 226 in the optical signal transmitting unit 220 and one interface of the receiving splitter 246 in the optical signal receiving unit 240 are connected by the fifth optical fiber 70.
It is worth mentioning that the lengths of the first optical fiber 30 and the second optical fiber 40 can be respectively and independently greater than the preset length, and the preset length can be 1 meter, 5 meters, 50 meters, 100 meters, 500 meters, 1000 meters or any other length. The length of the optical fiber is limited only by the practical need and the length that can be achieved in technical implementation. The length of the fifth optical fiber 70 is determined by the length between the receiving splitter and the light receiving port on the second optical fiber and the length between the transmitting splitter and the light emitting port on the first optical fiber.
In one embodiment, the length of the fifth optical fiber is:
L5＝L2f+L1f；
wherein L is5Is a fifth fiber length, L2fThe length between the receiving splitter and the light receiving port on the second optical fiber, L1fThe length between the launch splitter and the light launch port on the first fiber.
The length of the fifth optical fiber 70 calculated by the above formula can make the distance traveled in the optical fiber when the optical signal emitted by the first light source 120 reaches the first optical signal processing unit 140 through the fifth optical fiber 70 be the same as the distance traveled in the optical fiber when the optical signal of the first light source 120 reaches the first optical signal processing unit 140 through the optical signal receiving unit 240, and this arrangement can more quickly cancel the influence of the lengths of the first optical fiber 30 and the second optical fiber 40 on the test result of the distance measurement in the subsequent distance calculation.
The optical signal emitted by the first light source 120 may be a laser signal.
Preferably, the light emitting opening 222 and the light receiving opening 242 are coaxially arranged, but in an actual application scenario, the light emitting opening 222 and the light receiving opening 242 may not be coaxially arranged, and when the distance between the measured object and the distance measuring module 20 is subsequently calculated, the deviation caused by the different axial designs of the light emitting opening 222 and the light receiving opening 242 can be eliminated.
In one embodiment, the human-computer interaction unit 160 in the signal processing module 10 may set a specific measurement parameter and then transmit the set parameter to the first light source 120, and the first light source 120 transmits the light signal according to the set parameter after receiving the measurement command of the human-computer interaction unit 160. The optical signal is transmitted to the launch splitter 226 in the distance measurement module 20 via the first optical fiber 30; the optical signal is split into two paths of optical signals after passing through the transmitting splitter 226, one path of optical signal is transmitted to the light-emitting collimator 224 through the light-emitting port 222, and then the optical signal processes the optical signal of the first light source 120 into parallel light through the light-emitting collimator 224 and is transmitted to the object to be measured; the other optical signal is transmitted to the optical signal receiving unit 240 via the fifth optical fiber 70, and further, the other optical signal is transmitted to a port of the receiving splitter 246 via the fifth optical fiber 70.
In one embodiment, after the optical signal of the first light source 120 is emitted to the object to be measured and reflected by the object to be measured, a reflected optical signal is generated, and the reflected optical signal is received by the optical signal receiving unit 240 in the distance measuring module 20, more specifically, the optical receiving collimator 244 in the optical signal receiving unit 240 receives the object reflected optical signal, and the optical receiving collimator 244 may process the optical signal reflected by the object to be measured into parallel light to be received by the second optical fiber 40. The receiving splitter 246 in the optical signal receiving unit 240 combines the received optical signal from the second optical fiber 40 and the received optical signal from the fifth optical fiber 70, and transmits the combined optical signal to the first optical signal processing unit 140, and the first optical signal processing unit 140 calculates the two optical signals to obtain the distance between the object to be measured and the distance measuring module 20.
In one embodiment, the reflected light signal may be calculated by a TOF time-of-flight algorithm or a phase algorithm to obtain the distance between the object being measured and the distance measurement module 20. The specific algorithm is described above. The fifth optical fiber is also a return-to-zero optical fiber, and the distance between the object to be measured and the distance measuring module 20 can be acquired more quickly through the introduction of the fifth optical fiber.
In some embodiments, the reflected light signal may be calculated by other laser ranging algorithms to obtain the distance between the measured object and the distance measuring module 20, which is not limited in this disclosure.
In one application scenario, the distance measuring instrument may be arranged in a tank level measuring environment, wherein the liquid level refers to the height of the liquid level in the sealed container or the open container. In daily life and industrial production and operation, the liquid level in the container is required to be known frequently. Although the storage tank is provided with a liquid level meter for controlling the liquid level, the failure of the liquid level meter can cause empty tank and full tank, so that the production is suddenly interrupted or the storage tank overflows, and huge loss is caused; in some cases, the distance measuring instrument rather than the person must be used for measurement due to various factors such as the oversize tank body, the inconvenience of the person entering the tank body, the imperceptible appearance of the container materials such as the water tank and the like. Considering the safety of the liquid level measurement of the oil tank, the separated distance measuring instrument can be used for measuring, the distance measuring module in the distance measuring instrument is placed in the storage tank, and a user can measure the liquid surface in the storage tank by controlling the signal processing module outside the storage tank.
The technical scheme disclosed in the application can separate the light path part and the circuit part of the laser range finder, enlarges the application scene and the application range of the laser range finder, and improves the safety of the laser range finder in the using process. In addition, the light emitting port and the light receiving port are coaxially arranged, so that measurement deviation caused in a short-distance measurement environment can be reduced.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (17)
1. A distance measuring instrument comprising: signal processing module, first optic fibre, second optic fibre and distance measurement module, signal processing module includes: the system comprises a first light source, a first optical signal processing unit and a human-computer interaction unit; the distance measuring module includes: an optical signal transmitting unit, an optical signal receiving unit; it is characterized in that the preparation method is characterized in that,
the first light source is connected with the optical signal transmitting unit through a first optical fiber, and the first optical signal processing unit is connected with the optical signal receiving unit through a second optical fiber.
2. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently greater than a preset length.
3. The distance measuring instrument according to claim 1, wherein said optical signal emitting unit has an optical emitting opening, said optical signal receiving unit has an optical receiving opening, and said optical emitting opening and said optical receiving opening are coaxially disposed.
4. The distance measuring instrument according to claim 3, further comprising: a third optical fiber, the signal processing module, further comprising: a second light source, characterized in that,
a receiving splitter is arranged on the second optical fiber, the third optical fiber is connected with one inlet end of the receiving splitter and the second light source, and the length of the third optical fiber is as follows:
L3＝L1+L2f
wherein L is3Is a third fiber length, L1Is a first fiber length, L2fThe length between the receiving splitter and the light receiving port on the second optical fiber.
5. The distance measuring instrument according to claim 3, further comprising: a fourth optical fiber; the signal processing module further comprises: a second optical signal processing unit, characterized in that,
a transmitting splitter is arranged on the first optical fiber, the fourth optical fiber is connected with one outlet end of the transmitting splitter and the second optical signal processing unit, and the length of the fourth optical fiber is as follows:
L4＝L2+L1f
wherein L is4Is a fourth fiber length, L2Is the second fiber length, L1fThe length between the launch splitter and the light launch port on the first fiber.
6. The distance measuring instrument according to claim 3, further comprising: a fifth optical fiber, the first light source being a narrow pulse wave signal,
a receiving splitter is arranged on the second optical fiber, a transmitting splitter is arranged on the first optical fiber, an outlet of the transmitting splitter is connected with an inlet of the receiving splitter through a fifth optical fiber, wherein the length of the fifth optical fiber is as follows:
L5＝L2f+L1f；
wherein L is5Is a fifth fiber length, L2fThe length between the receiving splitter and the light receiving port on the second optical fiber, L1fThe length between the launch splitter and the light launch port on the first fiber.
7. The distance measuring instrument according to claim 1, wherein the distance measuring module comprises:
and the light emission collimator is used for processing the optical signal from the first light source into parallel light and emitting the parallel light to a measured object by the optical signal emitting unit.
8. The distance measuring instrument according to claim 1, wherein the distance measuring module comprises:
and the light receiving collimating mirror is used for processing the light signal reflected by the object to be measured into parallel light to be received by the second optical fiber.
9. The distance measuring instrument according to claim 1, wherein the first light source is a laser light source.
10. The distance measuring instrument according to claim 1, wherein said distance measuring module does not contain an electric circuit.
11. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently 0.9 m or more.
12. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently 2.1 meters or more.
13. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently equal to or greater than 3.1 meters.
14. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently 10.1 meters or more.
15. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently 101 meters or more.
16. The distance measuring instrument according to claim 1, wherein the lengths of the first optical fiber and the second optical fiber are each independently equal to or greater than 501 meters.
17. The distance measuring instrument according to claim 2, wherein the lengths of the first optical fiber and the second optical fiber are each independently equal to or greater than 1001 meters.
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| CN202021584638.1U CN212460045U (en) | 2020-08-03 | 2020-08-03 | Distance measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021584638.1U CN212460045U (en) | 2020-08-03 | 2020-08-03 | Distance measuring instrument |
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Effective date of registration: 20221104 Address after: 518000 4th floor, building e, Tangtou first industrial zone, Tangtou community, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Dolby Laser Co.,Ltd. Address before: 518132 6th floor, building B, Qiaode science and Technology Park, No.7, West District, Guangming high tech park, Tianliao community, Gongming office, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN DOBIY ELECTRONIC Co.,Ltd. |