A dual-wavelength laser ranging module and measurement system

Abstract

The present application relates to the field of laser ranging technology, and in particular to a dual-wavelength laser ranging module and measuring system, which includes a laser emitting component and a laser receiving component, wherein a first laser source is provided corresponding to the laser emitting component, and a first filter is provided for the laser receiving component; a second laser source is provided on one side of the first laser source, and the emission direction is perpendicular to the emission direction of the first laser source, and a plurality of second laser sources are provided along a straight direction; a semi-reflective and semi-mirror lens is provided obliquely, and the light-transmitting surface corresponds to the first laser source, and the light-reflecting surface corresponds to a second laser source, and a plurality of semi-reflective and semi-mirror lenses are provided in parallel corresponding to the second laser source; a second filter is provided corresponding to the second laser source; a switching component, wherein the first filter and the second filter are provided in the switching component, and the switching component is used to drive the first filter and the second filter to slide. The present invention has the effect of simplifying the structural complexity of a ranging instrument equipped with ranging lasers of different wavelengths.

Description

Technical Field

[0001] The present application relates to the field of laser ranging technology, and in particular to a dual-wavelength laser ranging module and a measurement system. Background Art

[0002] A laser rangefinder is a device that uses laser technology to measure distance non-contactly. It calculates the distance by emitting a laser beam and receiving the laser reflected back from the measurement target. It provides a fast, accurate and safe measurement method and is widely used today.

[0003] Laser rangefinders are equipped with different laser wavelengths depending on the usage scenario. Conventional short-range high-precision distance measurement applications can use red and green visible lasers for measurement, and long-range pulse laser measurement usually uses infrared invisible lasers. Under the existing technology, if you want a product to have two different distance measurement methods, generally two measurement modules equipped with lasers of different wavelengths are simply superimposed in structure. The shell of a measuring instrument requires two sets of laser emission and two sets of corresponding laser receiving optical systems. Using two sets of optical systems to work independently, emitting measurement laser signals, and the receiving system receiving the signals and sending them to the subsequent processing system for signal processing and analysis, makes the laser rangefinder larger and less portable, accompanied by high costs and complex assembly problems. At the same time, there are position differences between the different axes of the two sets of optical systems. Summary of the invention

[0004] In order to simplify the structural complexity of a distance measuring instrument equipped with distance measuring lasers of different wavelengths, the present invention provides a dual-wavelength laser distance measuring module and a measuring system.

[0005] On the one hand, the dual-wavelength laser ranging module provided by the present invention adopts the following technical solution: A dual-wavelength laser ranging module comprises a housing, a laser emitting component and a laser receiving component are arranged inside the housing, a first laser source is arranged inside the housing corresponding to the laser emitting component, and a first filter is arranged inside the housing corresponding to the laser receiving component, characterized in that it also comprises: A second laser source is arranged at one side of the first laser source, and an emission direction is perpendicular to the emission direction of the first laser source, and a plurality of the second laser sources are arranged along a straight direction; A semi-reflective and semi-mirror sheet is tiltedly arranged inside the housing, with a light-transmitting surface corresponding to the first laser source and a light-reflecting surface corresponding to the second laser source, and a plurality of semi-reflective and semi-mirror sheets are arranged in parallel corresponding to the second laser source; The second filter is arranged inside the shell corresponding to the second laser source. A switching component is arranged inside the shell. The first filter and the second filter are arranged in the switching component. The switching component is used to drive the first filter and the second filter to slide.

[0006] By adopting the above technical solution, the two optical systems in the traditional solution are separated, and the components related to laser emission and reception in the optical system are incorporated into one housing; the rangefinder in the traditional solution is only provided with a first laser source and a first filter corresponding to the first laser source, the first laser source emits laser light, and after being reflected by the ranging target, the first filter receives the reflected laser light of the first laser source; In the above scheme, the wavelength of the second laser source is different from that of the first laser source, and the first laser source and the second laser source are used to measure normal distance and long distance respectively; the first laser source projects a light beam onto the optical axis of the laser emission component through a semi-reflective and semi-mirror lens to emit laser information to the ranging target, and the second laser source is reflected by the semi-reflective and semi-mirror lens, and the reflected laser emission direction is parallel to the laser emission direction of the first laser source, so that the same emission system is used for output, and the wavelengths of the first laser source and the second laser source are different, and will not affect each other; Therefore, when switching between the far and near distance measurement application scenarios, the first laser source and the second laser source can be switched flexibly, and the filters corresponding to the two laser sources also need to be switched. The switching component operates synchronously with the switching of the two laser sources, and controls the two filters to switch synchronously with the two laser sources. Considering that the application of rangefinder is affected by the visibility of the environment, when the concentration of fog and haze in the environment is high, water droplets and particles in the air scatter the laser beam, forming speckles at the laser receiving component, reducing the accuracy and reliability of subsequent sensors. In fact, laser scattering problems also occur under normal conditions, but the impact is negligible. Therefore, in order to alleviate the laser scattering problem under specific conditions, the above scheme sets the first laser source and the second laser source as multi-point light sources in the shell. When the laser scattering degree is high, the multi-point light source is turned on, and the first laser source or the second laser source emits multiple lasers at the same time. The laser receiving component receives the speckle array of multiple lasers, records the speckle array signal, superimposes it, obtains the phase information of the received signal, and calculates the phase difference between the receiving and transmitting ends of the laser for comparison, thereby improving the signal-to-noise ratio of the signal and achieving the accuracy of the rangefinder in a high scattering environment; Taking into account that the second laser source needs to be reflected by a semi-reflective and semi-transparent lens, under the setting of multiple light sources, the outgoing light and the reflected light are relatively dense and easy to cause mixed light interference. The light overlaps at the laser receiving component, and the light sensor at the receiving point is prone to detection errors. Therefore, multiple second laser sources are evenly spaced on a straight line, or more precisely, on a straight line parallel to the outgoing direction of the first laser source. When multiple lasers need to be emitted at the same time, multiple laser lights with similar distances on the second laser sources are emitted simultaneously on the multiple second laser sources. At the same time, the positions of the second laser sources are fine-tuned and staggered to avoid the above-mentioned mixed light overlap problem and ensure the accuracy of the laser receiving component.

[0007] Optionally, the switching component includes: A bracket is slidably connected to the inside of the shell, and the sliding direction is perpendicular to the incident direction of the laser; The electromagnets are arranged on both sides of the bracket, the magnetic directions of the electromagnets are opposite, and the operating states of the two electromagnets are opposite.

[0008] By adopting the above technical solution, when the first laser source is used for distance measurement, the laser is reflected by the distance measurement target to the laser receiving component, and is converged by the laser receiving component and transmitted to the subsequent first filter. One electromagnet remains stationary and does not operate, and the other electromagnet remains adsorbed and operates. The first filter is located in front of the optical sensor, and the laser passes through the first filter to reach the optical sensor to obtain a measurement result. When it is necessary to switch to the second laser source for ranging, the two electromagnets switch their operating states. The electromagnet that was not operating originally adsorbs the bracket, and the electromagnet that was operating originally stops and cancels the adsorption of the bracket. As a result, the bracket drives the first filter and the second filter to slide, and switches the second filter to the position in front of the light sensor.

[0009] Optionally, the electromagnet on one side of the bracket close to the laser emitting assembly is replaced with a spring; The elastic force direction of the spring is parallel to the magnetic force direction of the electromagnet, one end of the spring is fixedly connected to the inner wall of the shell, and the other end of the spring is fixedly connected to the bracket.

[0010] By adopting the above technical solution, the electromagnet on one side is replaced with a spring, or more precisely, the electromagnet on the side of the bracket close to the laser emitting component is replaced with a spring, which can save energy consumption of the laser rangefinder, and the elastic force of the spring can completely replace the original electromagnet on this side; The remaining electromagnet is in a stationary and non-operating state when the first laser source is in operation, the spring is in a normal state, and the elastic force acting on the bracket is 0. When the first laser source is switched to the second laser source, the electromagnet operates to adsorb the bracket, and at the same time the spring is stretched, and the elastic potential energy is enhanced. When the second laser source is in operation, the electromagnet keeps operating to adsorb the bracket so that the second filter is aligned with the optical sensor; when the rangefinder is turned off or the ranging laser is switched back to the first laser source, the electromagnet stops operating, the elastic potential energy is released instantly, and the bracket is instantly pulled back to the state where the first filter is aligned with the optical sensor under the action of the elastic force; In addition, considering that even if the inner wall of the bracket is made of magnetic insulating materials such as aluminum plate, copper plate, etc., the magnetic interference of the electromagnet on the side of the bracket close to the laser emitting component to the laser emitting component side still exists, replacing it with a spring can also greatly reduce the magnetic interference and increase the service life of the components of the rangefinder.

[0011] On the other hand, the present invention provides a dual-wavelength laser ranging module measurement system using the following technical solutions: A measurement system of a dual-wavelength laser ranging module, characterized in that it comprises a signal processing module, an input control module, and an electromagnetic control module; The signal processing module receives the electrical signal of the laser receiving component, calculates, samples, analyzes and processes the signal; the signal processing module has a pre-stored instruction file, and runs the instruction file according to the electrical signal to generate an instruction; The input control module is connected to the signal processing module to retrieve, rewrite or run the instruction file inside the signal processing module; The electromagnetic control module is connected to the signal processing module, receives instructions from the signal processing module, and controls the electromagnet to change its operating state.

[0012] By adopting the above technical solution, the signal processing module, input control module and electromagnetic control module are the basic components of the measurement system, providing basic functions such as laser emission, optical path adjustment, optical signal reception and photoelectric conversion of the laser rangefinder; Among them, the signal processing module is the main processing module of the measurement system. For rangefinders with large size, high intelligence and relatively accurate results, small single-chip microcomputers, small processors, etc. can be used. For portable rangefinders, it is recommended to use storage and control chipsets, such as MCU chips. The signal processing module controls the above-mentioned ranging laser to be generated from the first laser source and the second laser source, and is emitted through the laser emitting component, and then returns to the laser receiving component through the ranging target. The optical sensor converts the received laser into an electrical signal and sends it to the signal processing module. The signal processing module calculates, analyzes and processes the numerical value; the signal processing module sends a ranging laser switching instruction to switch the first laser source, the second laser source and the first filter and the second filter adapted to the wavelengths of the two laser sources; the input control module provides a priority channel for technicians to rewrite the internal instruction file of the signal processing module. The input instruction of the input control module has a higher priority than the native instruction of the signal processing module, so that the components of the rangefinder give priority to the input instructions of the technicians; the electromagnetic control module usually mainly includes the power circuit control chip of the electromagnet, and the power circuit electric control magnetic suction switch specifically embodied in the circuit. The electromagnetic control module receives the instruction of the signal processing module and controls the electromagnet to change the operating state.

[0013] Optionally, a phase detection module is also included; The phase detection module is arranged corresponding to the laser receiving component. When the laser receiving component receives the laser, the phase detection module records the phase of the laser projection and sends the detection result value to the signal processing module. The signal processing module pre-stores a valid phase value interval corresponding to the laser receiving phase By adopting the above technical solution, the phase detection module is set at the laser receiving end to record the phase information of the laser echo, which is used by the signal processing module to calculate the phase deviation value of the laser echo signal to determine the measured distance; In actual applications, particulate impurities and water droplets in the air form partial refraction and the refraction of the lens group. Particulate impurities and water droplets adhere to the surface of the laser receiving component of the rangefinder to increase the surface roughness and granularity, forming sub-wave sources, i.e., surface elements, which will affect the phase information of the signal. In actual applications, the impact is small for situations where the accuracy requirements are not high, but it cannot be ignored for application scenarios with high measurement accuracy; Therefore, for the above-mentioned nonlinear distortion error, a reference source can be set in the phase detection module to record the output phase of the laser, compare the received phase received by the laser receiving component, and eliminate the phase error caused by the lens group and the internal processing circuit in different environments.

[0014] Optionally, it also includes a multi-point start module; The multi-point start-up module is connected to the signal processing module to control the single-point and multi-point operation status of the first laser source and the second laser source; when the signal processing module obtains the analysis result that the real-time laser projection phase value falls outside the valid phase value interval, it generates a control instruction and sends it to the multi-point start-up module, and the multi-point start-up module controls the first laser source and multiple second laser sources to emit at multiple points.

[0015] By adopting the above technical solution, since the first laser source and the plurality of second laser sources are all multi-point light sources, the two laser sources are both equipped with single-line laser and multi-line laser emission modes, the multi-point start module is operated, the emission mode of the two laser sources is changed to multi-line laser, the multi-point start module is stationary, and the emission mode of the two laser sources is single-line laser; The laser source emits multiple lasers at the same time to increase the calculation base of the above laser phase difference. The phase difference values ​​of multiple lasers are calculated and averaged at the same time to reduce the laser error caused by scattering. This places high requirements on the processing capability of the signal processing module, so it is recommended to use an MCU chip.

[0016] Optionally, an automatic switching module is also included; The automatic switching module stores a switching instruction file inside, which is connected to the signal processing module and the electromagnetic control module. When the signal processing module cannot receive the ranging value within a measurement cycle, the instruction file automatically runs to generate a control instruction to control the automatic switching module to switch the ranging laser; The electromagnetic control module receives the switching instruction from the automatic switching module and controls the operation of the electromagnet.

[0017] By adopting the above technical solution, the automatic switching module is used to automatically switch the first laser source and the second laser source when switching between long and short distances, without the need for manual switching by technicians, thereby improving the practicality and adaptability of the laser rangefinder; Specifically, the validity of the data received by the information processing module can be judged. For the red and green visible lasers used for conventional short-range measurements, the laser receiving component cannot effectively receive the long-range pulsed laser when measuring long-range targets. Therefore, the optical sensor cannot generate a stable current signal, and the information processing module cannot receive or actively retrieve valid result data within a distance measurement cycle. For long-range pulsed laser measurement, its principle relies on high-precision time measurement. For conventional short-range measurements, the time interval is short and is usually difficult to capture in practical applications. Therefore, the switching instruction of the laser source can be simply made by whether the signal processing module receives a valid value. When the laser source is switched, the electromagnetic control module synchronously controls the switching of the first filter and the second filter.

[0018] Optionally, an intensity control module is also included; The intensity control module is connected to the signal processing module, the input control module, the first laser source, and the second laser source. The intensity control module receives control instructions from the input control module to control the laser energy intensity of the first laser source and the second laser source. The intensity control module receives the signal from the signal processing module. When the signal processing module obtains an analysis result that the real-time laser projection phase value falls outside the valid phase value interval, the intensity control module is synchronized with the multi-point start module to change the laser energy intensity of the first laser source and the second laser source.

[0019] By adopting the above technical solution, the intensity control module can control the multi-point laser energy intensity of the first laser source and the second laser source, and enhance the output energy intensity of the laser when the ambient light is relatively bright or the ambient scattering degree is relatively high; the laser energy intensity can be adjusted by setting a sliding block on the outer shell body of the rangefinder, and setting the light intensity gear corresponding to the sliding block, and the technician slides the sliding block to adjust the laser light intensity; or, instructions can be pre-stored in the signal processing module to control related software or files, and determine whether the laser energy and laser brightness are sufficient according to the above laser reflection wavelength, so as to automatically and feedback-type adjust the laser energy.

[0020] In addition to adapting to bright environments, increasing the light intensity, reducing laser coherence, and enhancing imaging contrast can compensate for the speckle problem to a certain extent.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The dual-wavelength laser ranging module can perform accurate measurements in different wavelength distance application scenarios by setting the first laser source and the second laser source, as well as the corresponding first filter and the second filter. That is to say, by switching lasers of different wavelengths and corresponding to different ranging principles and algorithms, it can combine long-distance low-precision measurements with short-distance high-precision measurements, expand application scenarios, reduce blind spots, and improve product adaptability.

[0022] 2. The introduction of the switching component enables the first filter and the second filter to switch automatically without manual operation, which significantly improves the response speed and operation convenience of the measurement system and is suitable for rapidly changing measurement environments; 3. Multiple second laser sources are arranged along the vertical direction to form a multi-point light source with the first laser source to avoid inaccurate ranging results caused by laser aliasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0024] Figure 2 It is a cross-sectional view of the first embodiment of the present application.

[0025] Figure 3 It is a structural schematic diagram of the multi-point light source used in Example 1 of the present application.

[0026] Figure 4 It is a cross-sectional view of the second embodiment of the present application.

[0027] Figure 5 It is a logic block diagram of the operation of the measurement system of Example 3 of the present application.

[0028] Explanation of the accompanying drawings: 1. Shell; 11. First laser source; 12. Second laser source; 13. Semi-reflective and semi-mirror lens; 14. Laser emitting assembly; 15. Laser receiving assembly; 16. Bracket; 17. First filter; 18. Second filter; 19. Electromagnet; 2. Signal processing module; 21. Input control module; 22. Electromagnetic control module; 23. Intensity control module; 24. Phase detection module; 25. Multi-point start module; 26. Automatic switching module. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-5 This application is described in further detail. Embodiment 1

[0030] The present application embodiment discloses a dual-wavelength laser ranging module. Figure 1A dual-wavelength laser ranging module includes a shell 1, the interior of the shell 1 is divided into two parts: an emitting area and a receiving area. A laser emitting component 14 is arranged at one end of the emitting area, and a laser generating group is arranged in the area. The laser generating group includes a laser light source and a light source power supply. A laser receiving component 15 is arranged at the same end of the receiving area as the laser emitting component 14, and a laser receiving group is arranged at the other end of the receiving area. A light sensor is arranged in the laser receiving group; the ranging laser generated by the laser light source is emitted to the ranging target through the laser emitting component 14, and the ranging target reflects the laser. After being received and processed by the laser receiving component 15, the light sensor converts the laser pulse signal into an electrical signal; the shell 1 is integrated with, or externally connected to, a main control processor, which is connected to the light sensor through a signal transmission line to receive the electrical signal of the light sensor.

[0031] Reference Figure 2 The above-mentioned laser light source includes a first laser source 11 arranged at one end of the shell 1 and installed on the inner wall of the shell 1. The laser emitted by the first laser source 11 penetrates the axis of the laser emitting component 14, so that the laser emitting component 14 can effectively converge and transmit the laser optical fiber, and record the emission phase of the first laser source 11 for speckle compensation. The laser light source also includes a plurality of second laser sources 12, the wavelength of the second laser source 12 is different from that of the first laser source 11, and the two are used for long-distance and short-distance measurement respectively; a plurality of second laser sources 12 are evenly distributed along the laser emission direction of the first laser source 11, and the laser emission direction of the second laser source 12 is perpendicular to the emission direction of the first laser source 11; a semi-reflective and semi-mirror sheet 13 is tiltedly arranged inside the shell 1 corresponding to each second laser source 12, the transmission surface of the semi-reflective and semi-mirror sheet 13 corresponds to the first laser source 11, and the reflection surface corresponds to the second laser source 12, and the semi-reflective and semi-mirror sheet 13 is tilted at a preset angle so that the reflection effect of the laser mirror semi-reflective and semi-mirror sheet 13 of the second laser source 12 coincides with the emission optical path of the first laser source 11; thus, the first laser source 11 and the second laser source 12 are turned on alternately without interfering with each other to achieve long-distance and short-distance ranging.

[0032] Reference Figure 3 In this embodiment, both the first laser source 11 and the second laser source 12 use multi-point light sources, which include a main emitting unit located in the center and a plurality of secondary emitting units arranged in a circumferential array outside the main emitting unit. In actual detection, only the main emitting unit can be turned on, or both the main emitting unit and the secondary emitting unit can be turned on at the same time, so that the same laser source emits multiple ranging lasers, which is suitable for special weather environments. Based on this, the multiple second laser sources 12 are distributed at equal intervals, which can avoid the problem of overlapping reflected light paths of multiple lasers from the same laser source.

[0033] Reference Figure 2, a first filter 17 and a second filter 18 are provided in the receiving area of ​​the housing 1 corresponding to the optical sensor, the filter wavelength of the first filter 17 corresponds to the first laser source 11, and the filter wavelength of the second filter 18 corresponds to the second laser source 12, a bracket 16 is provided in the housing 1 corresponding to the first filter 17 and the second filter 18, the distribution direction of the first filter 17 and the second filter 18, and the sliding direction of the bracket 16 are perpendicular to the direction of the laser circuit in the receiving area, and the first filter 17 and the second filter 18 are driven to align the laser receiving path and the optical sensor respectively through the sliding of the bracket 16. Electromagnets 19 are provided at both ends of the bracket 16, one electromagnet 19 is fixedly installed on the outside of the housing 1, and the other electromagnet 19 is fixedly installed in the part between the receiving area and the emitting area inside the housing 1, and aluminum plates or copper plates and other materials for blocking magnetic force are provided in the corresponding part inside the housing 1.

[0034] The implementation principle of a dual-wavelength laser ranging module in the embodiment of the present application is as follows: the wavelengths of the first laser source 11 and the plurality of second laser sources 12 are different, and they are used for short-range and long-range measurements respectively. The second laser source 12 is arranged on one side of the emission area inside the housing 1 that does not interfere with the first laser source 11, and the laser light is reflected to the part parallel to the laser light of the first laser source 11 through the semi-reflective semi-mirror sheet 13; When the laser source is switched, the first filter 17 and the second filter 18 should be switched accordingly; under normal conditions, one of the two electromagnets 19 is in operation and the other is in a stationary state, so that one of the first filter 17 and the second filter 18 is aligned with the light sensor; when switching, the two electromagnets 19 only need to change their operation state. Embodiment 2

[0035] The present application embodiment discloses a dual-wavelength laser ranging module, which is different from the first embodiment in that the driving mode of the bracket 16 is different. Figure 4 The electromagnet 19 inside the shell 1 of the two electromagnets 19 is changed to a spring, one end of the spring is fixedly connected to the inner wall of the shell 1, and the other end of the spring is fixedly connected to the bracket 16. The spring force is used to replace the adsorption force of the electromagnet 19, and the position and state of the bracket 16 are controlled by the opening and closing state of the electromagnet 19. Embodiment 3

[0036] The embodiment of the present application discloses a measurement system of a dual-wavelength laser ranging module, which is used to electrically control the dual-wavelength laser ranging module disclosed in the first embodiment and the second embodiment. Figure 5A measurement system of a dual-wavelength laser ranging module includes a signal processing module 2, an input control module 21, an electromagnetic control module 22, an automatic switching module 26, a multi-point start module 25, a phase detection module 24, and an intensity control module 23. Among them, the signal processing module 2 is the main control module of the measurement system. Considering the requirements for signal processing performance in this embodiment, the signal processing module 2 uses an MCU chip, but in actual applications, a small single-chip microcomputer, a small processor, a DSP chip, etc. can also be selected according to actual performance requirements. It has the ability to store and call data. The signal processing module 2 is pre-stored with instruction files, receives electrical signals, calculates, samples, analyzes and processes, and runs instruction files according to corresponding electrical signals to generate instructions.

[0037] Reference Figure 5 The input control module 21 is connected to the signal processing module 2, and retrieves, rewrites or runs the instruction file inside the signal processing module 2, providing instruction priority running and rewriting channels, and the signal processing module 2 gives priority to running the input instructions of the input control module 21; the technician flexibly switches the laser operating status of the first laser source 11 and the second laser source 12 through the input control module 21, and at the same time switches the positions of the first filter 17 and the second filter 18 to realize the function switching of far and near ranging.

[0038] Reference Figure 5 The electromagnetic control module 22 is connected to the signal processing module 2, receives the instruction of the signal processing module 2, controls the electromagnet 19 to change its operating state to switch the positions of the first filter 17 and the second filter 18; specifically, the electromagnetic control module 22 mainly includes the power circuit control chip of the electromagnet 19, and the power circuit electric-controlled magnetic switch specifically embodied in the circuit. The electromagnetic control module 22 receives the instruction of the signal processing module 2, and controls the electromagnet 19 to change its operating state.

[0039] Reference Figure 5, the phase detection module 24 is integrated in the laser receiving component 15 and the laser emitting component 14. When the laser receiving component 15 receives the laser, the phase detection module 24 inside it records the phase of the laser projection and sends the detection result value to the signal processing module 2; in this scheme, the phase detection module 24 usually uses a phase modulator to measure the phase delay generated by the round-trip measurement line of the modulated light in sequence, and then converts the distance represented by the phase delay according to the wavelength of the modulated light. In some embodiments, the phase difference can be calculated by using a phase difference accurate frequency measurement algorithm based on the FMCW resampling method. In this method, the phase detection module 24 mainly includes a high-precision frequency modulator integrated in the laser emitting component 14, and an optical signal modulator set in the laser receiving component 15. Through signal modulation, it is ensured that there is no amplitude modulation in the signal after resampling, thereby improving the stability and measurement accuracy of the signal. Through the frequency analysis of the signal processing module 2, the frequency information is extracted by Fourier transform and phase comparison is performed. This method has high requirements for the signal processing module 2.

[0040] Reference Figure 5 The multi-point starting module 25 is connected to the signal processing module 2 to control the single-point and multi-point operating states of the first laser source 11 and the second laser source 12. Specifically, the multi-point starting module 25 mainly includes the electronic control component part of the laser power supply circuit of the first laser source 11 and the second laser source 12; when the signal processing module 2 obtains the analysis result that the real-time laser projection phase value falls outside the valid phase value interval, the signal processing module 2 sends a control instruction to the multi-point starting module 25, and the multi-point starting module 25 starts multiple secondary laser light sources, increasing the number of laser lines to increase the judgment and calculation base of the signal processing module 2, thereby reducing the laser error caused by scattering.

[0041] Reference Figure 5 The automatic switching module 26 is connected to the signal processing module 2 and the electromagnetic control module 22. The automatic switching module 26 stores a switching instruction file. When the signal processing module 2 cannot receive the ranging value within a measurement cycle, the signal processing module 2 sends a switching instruction to the automatic switching module 26. The instruction file inside the automatic switching module 26 runs to generate a control instruction to control the switching of the ranging laser; at the same time, the automatic switching module 26 receives the switching instruction of the automatic switching module 26 from the electromagnetic control module 22 to control the electromagnet 19 to run and switch synchronously.

[0042] Reference Figure 5The intensity control module 23 is connected to the signal processing module 2, the input control module 21, the first laser source 11, and the second laser source 12. The intensity control module 23 is mainly integrated in the power supply part of the first laser source 11 and the second laser source 12, and controls the power supply current value of the first laser source 11 and the first laser source 11 in a controllable resistance manner, thereby controlling the energy intensity of the first laser source 11 and the second laser source 12. The intensity control module 23 receives the signal from the signal processing module 2. When the signal processing module 2 obtains the analysis result that the real-time laser projection phase value falls outside the effective phase value interval, the intensity control module 23 is synchronized with the multi-point start module 25 to change the laser energy intensity of the first laser source 11 and the second laser source 12.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dual-wavelength laser ranging module, comprising a housing (1), wherein a laser emitting component (14) and a laser receiving component (15) are arranged inside the housing (1), wherein a first laser source (11) is arranged inside the housing (1) corresponding to the laser emitting component (14), and wherein a first filter (17) is arranged inside the housing (1) corresponding to the laser receiving component (15), wherein: Also includes: A second laser source (12) is arranged on one side of the first laser source (11), and has an emission direction perpendicular to the emission direction of the first laser source (11), wherein a plurality of the second laser sources (12) are arranged along a straight direction; A semi-reflective and semi-mirror sheet (13) is arranged obliquely inside the housing (1), with a light-transmitting surface corresponding to the first laser source (11) and a light-reflecting surface corresponding to the second laser source (12), and a plurality of semi-reflective and semi-mirror sheets (13) are arranged in parallel corresponding to the second laser source (12); A second optical filter (18) is arranged inside the housing (1) corresponding to the second laser source (12); a switching component is arranged inside the housing (1); the first optical filter (17) and the second optical filter (18) are arranged on the switching component; the switching component is used to drive the first optical filter (17) and the second optical filter (18) to slide; The first laser source (11) and the second laser source (12) are multi-point light sources.

2. A dual-wavelength laser ranging module according to claim 1, characterized in that: The switching component comprises: A bracket (16) is slidably connected to the inside of the housing (1), with the sliding direction being perpendicular to the incident direction of the laser; The electromagnets (19) are arranged on both sides of the bracket (16); the magnetic directions of the electromagnets (19) are opposite, and the operating states of the two electromagnets (19) are opposite.

3. A dual-wavelength laser ranging module according to claim 2, characterized in that: The electromagnet (19) on the side of the bracket (16) close to the laser emitting assembly (14) is replaced with a spring; The elastic force direction of the spring is parallel to the magnetic force direction of the electromagnet (19), one end of the spring is fixedly connected to the inner wall of the housing (1), and the other end of the spring is fixedly connected to the bracket (16).

4. A measurement system applied to a dual-wavelength laser ranging module as claimed in claim 2 or 3, characterized in that: It comprises a signal processing module (2), an input control module (21), and an electromagnetic control module (22); The signal processing module (2) receives the electrical signal of the laser receiving component (15), performs calculation, sampling, analysis and processing; the signal processing module (2) has a pre-stored instruction file, and runs the instruction file according to the electrical signal to generate an instruction; The input control module (21) is connected to the signal processing module (2) to retrieve, rewrite or run the instruction file inside the signal processing module (2); The electromagnetic control module (22) is connected to the signal processing module (2), receives instructions from the signal processing module (2), and controls the electromagnet (19) to change its operating state.

5. The measurement system of a dual-wavelength laser ranging module according to claim 4, characterized in that: Also includes a phase detection module (24); The phase detection module (24) is arranged corresponding to the laser receiving component (15); when the laser receiving component (15) receives laser light, the phase detection module (24) records the phase of the laser echo signal and sends the detection result value to the signal processing module (2); The signal processing module (2) pre-stores a valid phase value interval corresponding to the laser receiving phase.

6. The measurement system of a dual-wavelength laser ranging module according to claim 5, characterized in that: Also includes a multi-point starting module (25); The multi-point start module (25) is connected to the signal processing module (2) to control the single-point and multi-point operation states of the first laser source (11) and the second laser source (12); when the signal processing module (2) obtains an analysis result that the real-time laser projection phase value falls outside the effective phase value interval, a control instruction is generated and sent to the multi-point start module (25), and the multi-point start module (25) controls the first laser source (11) and the plurality of the second laser sources (12) to emit at multiple points.

7. The measurement system of a dual-wavelength laser ranging module according to claim 5, characterized in that: Also includes an automatic switching module (26); The automatic switching module (26) stores a switching instruction file inside, and is connected to the signal processing module (2) and the electromagnetic control module (22). When the signal processing module (2) is unable to receive a distance measurement value within a measurement cycle, the instruction file automatically runs to generate a control instruction to control the automatic switching module (26) to switch the distance measurement laser; The electromagnetic control module (22) receives the switching instruction from the automatic switching module (26) and controls the operation of the electromagnet (19).

8. The measurement system of a dual-wavelength laser ranging module according to claim 6, characterized in that: Also includes an intensity control module (23); The intensity control module (23) is connected to the signal processing module (2), the input control module (21), the first laser source (11), and the second laser source (12); the intensity control module (23) receives control instructions from the input control module (21) and controls the laser energy intensity of the first laser source (11) and the second laser source (12); The intensity control module (23) receives the signal from the signal processing module (2), and when the signal processing module (2) obtains an analysis result that the real-time laser projection phase value falls outside the effective phase value interval, the intensity control module (23) is synchronized with the multi-point start module (25) to change the laser energy intensity of the first laser source (11) and the second laser source (12).

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