CN108919287B - Point type laser ranging device and method for narrow space - Google Patents
Point type laser ranging device and method for narrow space Download PDFInfo
- Publication number
- CN108919287B CN108919287B CN201810633680.9A CN201810633680A CN108919287B CN 108919287 B CN108919287 B CN 108919287B CN 201810633680 A CN201810633680 A CN 201810633680A CN 108919287 B CN108919287 B CN 108919287B
- Authority
- CN
- China
- Prior art keywords
- light
- controller
- measuring channel
- measured
- integrated circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004891 communication Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000005259 measurement Methods 0.000 claims description 24
- 238000012966 insertion method Methods 0.000 claims description 7
- 238000010291 electrical method Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000005693 optoelectronics Effects 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims 1
- 238000004364 calculation method Methods 0.000 description 7
- 230000017525 heat dissipation Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a narrow space point type laser ranging device and a ranging method thereof, the device comprises a controller, a first measuring channel and a second measuring channel which are used for respectively ranging, a front-stage beam splitter which is used for splitting emitted light into two beams, a rear-stage beam splitter which is used for splitting reflected light into two beams and a luminous source which is used for emitting light, wherein the controller is in communication connection with a monostable trigger, the first measuring channel and the second measuring channel are both in communication connection with the controller, and the ranging method can realize more accurate ranging.
Description
Technical Field
The invention belongs to the technical field of laser ranging, and particularly relates to a narrow space point type laser ranging device and a ranging method thereof.
Background
The laser has the characteristics of strong directivity, high brightness and high focusing temperature, is commonly used on a laser ranging device and is used for ranging, the laser ranging has the characteristics of high precision and high efficiency, but the size of the equipment is larger, the focusing temperature of the laser is high, a large amount of heat is generated when a laser emitter is used, the heat dissipation of the laser is high, the light and miniaturized design is not easy to realize, a laser ranging system is particularly adopted in a narrow space, and the heat dissipation space is limited, if the heat is not timely dredged, the service life of the laser ranging device is greatly reduced.
The ranging of the laser ranging system is related to the power factor of the laser transmitted pulse, wherein the power of the laser transmitted pulse directly affects the accuracy of the ranging.
The accuracy of the laser ranging system is mainly affected by the accuracy of the time difference measurement when the laser ranging system emits pulse laser ranging, however, due to the limitation of the time measurement technology, the accuracy of the laser ranging device for measuring the time difference in the prior art is poor, which results in the poor accuracy of the laser ranging device for measuring the distance.
In addition, at present, the distance is measured by an infrared distance measurement mode, but the detection precision is poor due to the fact that the infrared distance measurement time length is affected by the changes of the color and the light reflectivity of the measured object, and the background light has a great influence on the detection precision.
The above prior art has the following disadvantages;
1. at present, the laser ranging equipment is large in size, the laser is high in heat dissipation, light-weight miniaturization design is not easy to achieve, when the laser ranging equipment is used in a narrow space, the heat dissipation space is limited, and the service life of the laser ranging device is greatly shortened.
2. The power of the laser emission pulse directly influences the accuracy of distance measurement, but the existing laser distance measurement equipment has no function of monitoring the power of the laser emission pulse in real time and adjusting the power in time.
3. In the prior art, the measurement accuracy of the laser ranging device on the time difference is poor, which directly results in the measurement accuracy of the ranging device on the distance is also poor.
4. The infrared distance measurement mode is greatly influenced by the measured object, and the measurement precision is greatly influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a small-space point type laser ranging device which has the advantages of simple structure, suitability for being used in a small space with limited heat dissipation space and high measurement precision.
The invention also provides a ranging method of the narrow space point type laser ranging device, which has high measuring precision and is convenient to use.
The invention is realized by the following technical scheme:
the point-type laser ranging device in a narrow space comprises a controller, a first measuring channel and a second measuring channel, wherein the first measuring channel and the second measuring channel are used for measuring distance respectively, a front-stage beam splitter for dividing emitted light into two beams and a rear-stage beam splitter for dividing reflected light into two beams, and the controller triggers a light-emitting source through a monostable trigger;
the first measuring channel comprises a first light-transmitting lens, a second light-transmitting lens, a photoelectric position sensor, an application specific integrated circuit, a differential amplifier and a first analog-to-digital converter, wherein the application specific integrated circuit is connected with the monostable trigger, the application specific integrated circuit is connected with the light-emitting source in a light-emitting mode, the light-emitting source irradiates an object to be measured through the first light-transmitting lens after passing through the front-stage beam splitter, reflected light irradiates the photoelectric position sensor through the second light-transmitting lens after passing through the rear-stage beam splitter, the photoelectric position sensor is connected with the differential amplifier through the application specific integrated circuit, the differential amplifier is connected with the first analog-to-digital converter, and the first analog-to-digital converter is in communication connection with the controller;
the second track measurement comprises a photoelectric detector and a filter circuit which is output to the controller, and the other beam light of the front-stage beam splitter and the other beam light of the rear-stage beam splitter are respectively irradiated on the photoelectric detector in sequence and transmit signals to the controller through the filter circuit.
In the above technical solution, the application specific integrated circuit is connected with a capacitor MCP and a capacitor MCM.
In the above technical scheme, the filter circuit is a Gao Tongzu capacitor filter circuit, and is composed of a capacitor C1 and a resistor R1, one end of the resistor R1 is grounded, the other end of the resistor R1 and one end of the capacitor C1 are both connected to the controller, and the other end of the capacitor C1 is connected to the photodetector.
In the above technical scheme, the intelligent control system further comprises a display, wherein the display is in communication connection with the controller through an interface chip, and the model of the interface chip is 8279.
In the above technical scheme, the system further comprises a printer in communication connection with the controller.
In the above technical scheme, the device further comprises a power control module for measuring the power of the light emitting source, wherein the power control module is in communication connection with the controller, and the power control module is composed of an ambient light measuring sensor and a second analog-to-digital converter, and the ambient light measuring sensor is in communication connection with the light emitting source.
In the above technical scheme, a filter disc is arranged between the light-emitting source and the object to be measured.
In the above technical solution, the controller is an FPGA.
In the above technical solution, the asic is H2476, and the optoelectronic position sensor is a PSD.
In the above technical solution, the monostable trigger is a monostable trigger formed by a 555 timer.
The ranging method of the point-type laser ranging device in the narrow space comprises the following steps of:
1) The controller triggers the luminous source to emit light;
2) The first measuring channel and the second measuring channel both receive reflected light of an object to be measured, the first measuring channel is measured by adopting an electrical method and an average value method, and the second measuring channel is measured by adopting an insertion method and a method for measuring average values for multiple times and obtaining time difference;
3) The first measuring channel and the second measuring channel are used for comparing measured results in the controller, comparing the compared results with a standard range which is set in the controller in advance, taking a first measuring channel measured value when the compared results are in the standard range, and controlling the first measuring channel and the second measuring channel to be measured again by the controller when the compared results are not in the standard range.
The invention has the advantages and beneficial effects that:
1. the small-space point type laser ranging device is simple in structure, low in laser heat dissipation capacity, light in miniature design, suitable for being used in a small space with limited heat dissipation space, and long in service life.
2. The power control module of the small-space point type laser ranging device is used for measuring the power of the light-emitting source in real time, and the controller is used for controlling the power of the light-emitting source, so that the influence on precision caused by the power change of the light-emitting source is reduced.
3. According to the point-type laser ranging device for the narrow space, disclosed by the invention, the first measuring channel and the second measuring channel are adopted for measuring the distance, and the measured result is judged through the controller, so that a ranging numerical value with higher precision can be obtained.
4. According to the measuring method of the point-type laser ranging device in the narrow space, the photoelectric position sensor, the application specific integrated circuit and the electrical method are adopted for the first measuring channel, so that the influence of an object to be measured on ranging is reduced, and the precision is improved.
5. According to the measuring method of the point-type laser ranging device in the narrow space, the first measuring channel adopts the insertion method and the method of measuring the average value for multiple times to obtain the time difference to measure the distance, so that the measuring precision is improved.
Drawings
Fig. 1 is a schematic view of a small space point laser ranging device of the present invention.
Fig. 2 is a schematic pulse waveform diagram of a calculation time module of a second track of the narrow space point laser ranging device according to the present invention.
Fig. 3 is a diagram of a second channel filter circuit and a signal waveform transformation diagram of a small space spot laser ranging device according to the present invention.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the solution of the present invention better understood by those skilled in the art, the following description of the solution of the present invention is further provided with reference to fig. 1 to 3 and the specific examples.
Example 1
The utility model provides a narrow and small space point type laser rangefinder includes the controller, a first side measuring channel and a second side measuring channel for range finding respectively, be used for dividing into the preceding branch beam splitter of two bundles with the light emission source that is used for giving off light to the back branch beam splitter of reflection light split into two bundles, wherein, the light emission source is semiconductor laser, the controller is connected with monostable trigger communication, be used for controlling monostable trigger and trigger, first side measuring channel includes first lens, the second lens, photoelectric position sensor, application specific integrated circuit, differential amplifier and first analog-to-digital converter, wherein, application specific integrated circuit is connected with monostable trigger, the controller begins work through controlling monostable trigger (the controller begins work through controlling monostable trigger, monostable trigger sends trigger signal and triggers application specific integrated circuit), application specific integrated circuit is connected with the light source, the light emission of light source emission is through the preceding branch beam splitter back beam splitter first beam light irradiation to the object to be measured, the light emission reflector that will receive is gone out the reflection light to the location, the light emission reflector that the reflection light passes through the second side beam splitter first light splitter, photoelectric position sensor passes through the second light splitter, the photoelectric position sensor passes through the differential amplifier and the sensor is connected to the second side measuring channel, the amplifier passes through the sensor is connected with the second side measuring channel, the amplifier is connected with the sensor is connected to the other photoelectric position sensor respectively, the signal input to the amplifier is connected with the amplifier.
Further, the front-stage beam splitter and the rear-stage beam splitter are prisms for splitting the received light into multiple beams.
The device adopts the first measuring channel and the second measuring channel to measure the distance of an object to be measured, can realize the comparison of the measured distances of the first measuring channel and the second measuring channel, and obtains a more accurate measured value by adopting a comparison value.
Example two
As shown in fig. 1, a controller of a small-space point laser ranging device sends a trigger signal to a monostable trigger, wherein the monostable trigger is a monostable trigger formed by a 555 timer, the monostable trigger is connected with an external trigger pin of an integrated circuit and can trigger the integrated circuit to work, the integrated circuit generates a pulse signal with the same frequency as the monostable trigger and sends the pulse signal to a light-emitting source to enable the light-emitting source to work, the light-emitting source emits laser, the laser irradiates onto a front beam splitter through a filter disc and irradiates onto a first lens through the front beam splitter, the distance between the first lens and an object to be measured is D, the object to be measured emits the received laser onto a second prism, irradiates the emitted light onto the second lens through the second prism and irradiates onto an optoelectronic position sensor through the second lens, wherein the photoelectric position sensor is PSD, the photoelectric position sensor converts the received reflected light into an electric signal and transmits the electric signal to the special integrated circuit, the special integrated circuit is H2476, wherein in order to eliminate the influence of the background light and dark current of the photoelectric position sensor by the special integrated circuit, two pins of the special integrated circuit are respectively connected with a capacitor MCP and a capacitor MCM, wherein the capacitor MCP is used for storing direct current IP generated by the background light of the special integrated circuit before the photoelectric position sensor receives the optical signal, the capacitor MCM is used for storing direct current IM generated by the dark current of the special integrated circuit before the photoelectric position sensor receives the optical signal, the special integrated circuit receives the electric signal, the signal generated by the background light and the dark current and the electric signal sequentially pass through the differential amplifier, the differential amplifier makes a difference between the received electric signal and a signal generated by backlight and a signal generated by dark current, converts the difference into an analog voltage signal, and transmits the analog voltage signal to the first analog-to-digital converter, wherein the model of the first analog-to-digital converter is AD574, the first analog-to-digital converter converts the analog signal into a digital voltage signal, and transmits the digital voltage signal to the controller, wherein the digital voltage signal is the distance between the position of reflected light irradiated on the photoelectric position sensor and the central position of the photoelectric position sensor, and the controller calculates the distance value of the measured object through an internal program.
Further, the distance between the first light-transmitting lens and the second light-transmitting lens is B.
Further, the second lens is located at a distance L from the center of the photoelectric position sensor.
Further, the distance between the position of the reflected light irradiated on the photoelectric position sensor and the center position of the photoelectric position sensor is X.
Further, the distance between the first light-transmitting lens and the object to be measured is D', and according to the calculation formula: d '=bl/X, and the value of D' is calculated.
Further, the first track sequentially transmits the distance values measured for a plurality of times to the controller for storage, and the controller calculates the average value of the distance values measured for a plurality of times through an internal software program to obtain a final distance value.
Furthermore, the controller is an FPGA, so that the operation speed is high.
Further, the application specific integrated circuit is H2476.
The invention relates to a measuring method of a narrow space point type laser ranging device, wherein a photoelectric position sensor and an application specific integrated circuit are adopted for a first measuring channel, wherein a holding method of an electrical method is adopted, namely two pins of the application specific integrated circuit are respectively connected with a capacitor MCP and a capacitor MCM to reduce the influence of the background light and dark current of the application specific integrated circuit on ranging, a monostable trigger formed by a 555 timer has larger driving capability and can timely drive the application specific integrated circuit to normally work, the working efficiency is high, wherein a controller adopts an FPGA to enable the interior of the controller to be divided into a plurality of modules for working, the operating speed is high, the application specific integrated circuit is convenient to use, the H2476 is adopted, the circuit is small in size, light in weight, high in reliability, long in service life, convenient to install, high in speed, strong in ranging performance, capable of conveniently working in a narrow space, and generating a small amount of heat, and meeting a good ranging effect.
Example III
As shown in fig. 1, the light source emits laser light, the laser light is received by the photodetector through the front-stage beam splitter, the light beam is converted into a first electric signal, the first electric signal is transmitted to the time calculation module in the controller, the time calculation module comprises a time identification unit, an interval time generator and a time interval measuring unit, the time identification unit receives the first electric signal, the interval time generator is connected with the time identification unit and adopts synchronous clock pulses to emit clock signals, the accuracy of recording time points is ensured, the time identification unit is used for identifying and recording the time point t1 of the first electric signal, and the time point t1 is transmitted to the time interval measuring unit, wherein the counting pulse frequency of the time interval measuring unitThe method has the advantages that the operation speed is high, the measurement accuracy of counting quantization errors can reach 1ns, further, the light beam directly irradiated onto the first light-transmitting lens irradiates onto an object to be measured, the object to be measured is reflected and is divided into two beams through the second prism, one beam of light is reflected to the second light-transmitting lens, the other beam of light is reflected to the photoelectric detector, the photoelectric detector converts the reflected light beam into a second electric signal and transmits the electric signal to the time identification unit, the time identification unit identifies and records the time point t2 of the second electric signal, the time point t2 of the second electric signal is transmitted to the time interval measurement unit, the time interval measurement unit calculates the time difference Deltat=t2-t 1 between the first electric signal and the second electric signal through software, and the controller calculates the time difference Deltat and the calculation formula:and calculating the distance D of the object to be measured through a software program, wherein c is the propagation speed of the pulse laser signal in the atmosphere, and the controller calculates the calculated distance value.
Further, the time discrimination unit generates a clock signal according to time points T1 and T2 of the first electric signal and the second electric signal transmitted by the photoelectric detector, wherein the time interval generator generates a clock signal with a period of T, the time interval measurement unit measures the time points T1 and T2 of the first electric signal and the second electric signal with high precision by an insertion method, wherein the time interval generator is used for continuously detecting the time points T1 and T2 of the first electric signal and the second electric signal by the time discrimination unit, the time difference between the time points T1 and T2 measured by the clock signal is nT, the error generated by the time difference nT and the actual time difference Δt is Δt=nt- Δt, in order to realize accurate measurement, the error Δt is reduced, the time difference is measured with high precision by the time discrimination unit, and the time difference is calculated by the time difference measurement unit, and the time difference is calculated by the method.
Further, in order to achieve more accurate measurement, a filter circuit is arranged between the photoelectric detector and the controller, wherein the filter circuit is a Gao Tongzu capacitor filter circuit and is composed of a capacitor C1 and a resistor R1, one end of the resistor R1 is grounded, the other end of the resistor R1 and one end of the capacitor C1 are both connected to a pin (a pin for connecting a time calculation module) of the controller, the other end of the capacitor C1 is connected with the photoelectric detector, the photoelectric detector further transmits a first electric signal and a second electric signal to the time calculation module through the filter circuit, the filter circuit can change extreme points of the transmitted first electric signal and second electric signal into zero points, the time points of the changed first electric signal and second electric signal are taken as time points, the time interval measurement unit calculates a time difference, and the slope of the first electric signal and the second electric signal can be controlled to be within a range of +/-3 ps due to the fact that the measured time difference is influenced by the slope of the maximum values of the first electric signal and the second electric signal.
The second measuring channel of the narrow space point type laser distance measuring device adopts the photoelectric detector and the controller to measure the distance between objects to be measured, has simple and convenient structure, wherein the extreme values of the first electric signal and the second electric signal are respectively processed by adopting the filter circuit, so that the error is reduced, the precision is improved, and the measuring precision is greatly improved by adopting an insertion method and an averaging method in the measuring method of the device, so that the measuring number is more accurate.
Example IV
As shown in fig. 1, the emission source emits laser light, the emitted laser light irradiates onto the front-stage beam splitter through the filter, the filter can reduce interference of the environmental light source on the first measuring channel and the second measuring channel in the ranging process, the front-stage beam splitter can disperse the received laser light emitted by the emission source into three beams of light, the three beams of light irradiate onto the first lens, the photoelectric detector and the environmental light sensor respectively, the environmental light sensor is a laser sensor, the laser sensor is an avalanche diode and converts the received light beam into an electric signal, the laser sensor transmits the electric signal to the second analog-to-digital converter, the model of the second analog-to-digital converter is AD1674AD, the second analog-to-digital converter converts the electric signal into a digital signal, and transmits the digital signal to the controller, the controller calculates the power of the emission source through a software program according to the obtained digital signal, and the controller compares the power of the emission source with an internally set standard value (the power standard value of the emission source) and adjusts the power of the emission source so that the power of the emission source is always in an optimal state.
The power control module of the small-space point type laser ranging device can detect the power of the light-emitting source in real time and adjust the power in time, so that the power of the light-emitting source is always in a stable state, the influence of the precision caused by the power change of the light-emitting source is reduced, and the ranging precision is improved.
Example five
As shown in fig. 1, according to embodiments 1 and 2, the controller compares the final distance value measured by the first track with the distance value measured by the second track by a software program inside the controller and obtains a result (i.e., a ratio obtained by dividing the difference between the final distance value measured by the first track and the distance value measured by the second track by the final distance value measured by the first track), and further, when the comparison result exceeds a set standard range, the controller controls the first track and the second track to re-measure; when the comparison result is within the set standard range, the value of the first measuring channel measurement (or the value of the second measuring channel measurement) is selected as the distance value of the object to be measured. The controller is connected with a display (the display is an LED display screen) for displaying the measured distance value of the object to be measured, and the display is connected with the controller through an interface chip with the model of 8279. The controller is connected with the printer, and the printer is used for printing out the distance numerical value that each time first survey was said and second survey was said, and the convenience is recorded and analyzed.
Further, the standard range is set to be-5% to +5%.
The ranging method of the point-type laser ranging device in the narrow space comprises the following steps of:
1) The controller triggers the luminous source to emit light;
2) The first measuring channel and the second measuring channel both receive reflected light of an object to be measured, the first measuring channel is measured by adopting an insertion method and a method for measuring average value and obtaining time difference for a plurality of times, and the second measuring channel is measured by adopting an electrical method;
3) The first measuring channel and the second measuring channel are used for comparing measured results in the controller, comparing the compared results with a standard range which is set in the controller in advance, taking a first measuring channel measured value when the compared results are in the standard range, and controlling the first measuring channel and the second measuring channel to be measured again by the controller when the compared results are not in the standard range.
The invention relates to a narrow space point type laser ranging device which adopts a method of comparing distance values measured by a second measuring channel and selecting one value for ranging, so that the measured value is more accurate, the first measuring channel and the second measuring channel can complementarily measure the distance of an object to be measured, a better measuring effect is obtained, the measured distance is directly displayed by a display, the use is convenient, a printer is adopted for printing the measured value, the use can be convenient, the value of the measuring process can be analyzed and judged, the error is reduced by adopting an insertion method and a method of measuring the average value for a plurality of times by adopting the first measuring channel, and the error caused by the influence of backlight and dark current of an application-specific integrated circuit is effectively avoided by adopting an electrical method by adopting the second measuring channel, and the use is convenient.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. A distance measurement method of a point-type laser distance measurement device in a narrow space is characterized by comprising the following steps of: the device comprises a controller, a first measuring channel and a second measuring channel, a front-stage beam splitter, a rear-stage beam splitter and a light-emitting source, wherein the controller is used for measuring distance respectively, the front-stage beam splitter is used for splitting emitted light into two beams, the rear-stage beam splitter is used for splitting reflected light into two beams, and the light-emitting source is used for emitting light, and the controller is in communication connection with a monostable trigger;
the first measuring channel comprises a first light-transmitting lens, a second light-transmitting lens, a photoelectric position sensor, an application specific integrated circuit, a differential amplifier and a first analog-to-digital converter, wherein the application specific integrated circuit is connected with the monostable trigger, the application specific integrated circuit is connected with the light-emitting source, the light-emitting source irradiates an object to be measured through the first light-transmitting lens after passing through the front-stage beam splitter, reflected light irradiates the photoelectric position sensor through the second light-transmitting lens after passing through the rear-stage beam splitter, the photoelectric position sensor is connected with the differential amplifier through the application specific integrated circuit, the differential amplifier is connected with the first analog-to-digital converter, and the first analog-to-digital converter is in communication connection with the controller;
the second track measurement device comprises a photoelectric detector and a filter circuit which outputs the photoelectric detector to the controller, and the other beam light of the front-stage beam splitter and the other beam light of the rear-stage beam splitter respectively irradiate the photoelectric detector in sequence and transmit signals to the controller through the filter circuit;
the special integrated circuit is connected with a capacitor MCP and a capacitor MCM;
in order to eliminate the influence of the background light and the dark current of the special integrated circuit on the photoelectric position sensor, a capacitor MCP and a capacitor MCM are respectively connected to two pins of the special integrated circuit, wherein the capacitor MCP is used for storing direct current IP generated by the influence of the background light of the special integrated circuit before the photoelectric position sensor receives the optical signal, the capacitor MCM is used for storing direct current IM generated by the influence of the dark current of the special integrated circuit before the photoelectric position sensor receives the optical signal, the special integrated circuit receives the electric signal, the signals generated by the influence of the background light and the dark current and the electric signal sequentially pass through a differential amplifier, the differential amplifier makes a difference value between the received electric signal and the signals generated by the backlight and the signals generated by the dark current, converts the difference value into an analog voltage signal, and transmits the analog voltage signal to a first analog-to-digital converter;
the ranging method of the narrow space point type laser ranging device comprises the following steps of:
1) The controller triggers the luminous source to emit light;
2) The first measuring channel and the second measuring channel both receive reflected light of an object to be measured, the first measuring channel is measured by adopting an electrical method and an average value method, and the second measuring channel is measured by adopting an insertion method and a method for measuring average values for multiple times and obtaining time difference;
3) The first measuring channel and the second measuring channel are used for comparing measured results in the controller, comparing the compared results with a standard range which is set in the controller in advance, taking a first measuring channel measured value when the compared results are in the standard range, and controlling the first measuring channel and the second measuring channel to be measured again by the controller when the compared results are not in the standard range.
2. The ranging method of the small-space point type laser ranging device according to claim 1, wherein the filter circuit is a Gao Tongzu-capacity filter circuit and comprises a capacitor C1 and a resistor R1, one end of the resistor R1 is grounded, the other end of the resistor R1 and one end of the capacitor C1 are both connected to the controller, and the other end of the capacitor C1 is connected with the photodetector.
3. The method for ranging by a small-space point-type laser ranging device according to claim 1, further comprising a display, wherein the display is in communication connection with the controller through an interface chip, and the model of the interface chip is 8279.
4. The method for ranging a small space point laser ranging device of claim 1, further comprising a printer communicatively coupled to the controller.
5. The method for ranging a small space point laser ranging device according to claim 1, further comprising a power control module for measuring the power of the light source, wherein the power control module is in communication connection with the controller, and the power control module is composed of an ambient light measuring sensor and a second analog-to-digital converter, wherein the ambient light measuring sensor is in communication connection with the light source.
6. The ranging method of the small-space point-type laser ranging device according to claim 1, wherein a filter is arranged between the light-emitting source and the object to be measured.
7. The ranging method of the small-space point-type laser ranging device according to claim 1, wherein the controller is an FPGA.
8. The method for ranging a small space point laser ranging device according to claim 1, wherein the asic is H2476 and the optoelectronic position sensor is a PSD.
9. The ranging method of a small space point laser ranging device according to claim 1, wherein the monostable trigger is a monostable trigger consisting of 555 timers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810633680.9A CN108919287B (en) | 2018-06-20 | 2018-06-20 | Point type laser ranging device and method for narrow space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810633680.9A CN108919287B (en) | 2018-06-20 | 2018-06-20 | Point type laser ranging device and method for narrow space |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108919287A CN108919287A (en) | 2018-11-30 |
| CN108919287B true CN108919287B (en) | 2023-11-28 |
Family
ID=64419981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810633680.9A Active CN108919287B (en) | 2018-06-20 | 2018-06-20 | Point type laser ranging device and method for narrow space |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108919287B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820689B (en) * | 2020-06-18 | 2024-05-17 | 华为技术有限公司 | Receiver, laser ranging equipment and point cloud image generation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11215062A (en) * | 1997-10-24 | 1999-08-06 | Canon Inc | Optical spatial communication equipment |
| JP2001349943A (en) * | 2000-06-06 | 2001-12-21 | Hitachi Ltd | Laser range finder, laser range finding method, and measuring device |
| CN103412313A (en) * | 2013-07-30 | 2013-11-27 | 桂林理工大学 | Small low-altitude light area array laser radar measuring system |
| CN103941263A (en) * | 2014-04-28 | 2014-07-23 | 北京控制工程研究所 | Inter-satellite ranging method based on quantum light sources on satellites and reflector |
| CN107167813A (en) * | 2017-05-19 | 2017-09-15 | 深圳市瑞大科技有限公司 | Optical radar |
| CN208207215U (en) * | 2018-06-20 | 2018-12-07 | 中核(天津)科技发展有限公司 | Small space point type laser ranging system |
-
2018
- 2018-06-20 CN CN201810633680.9A patent/CN108919287B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11215062A (en) * | 1997-10-24 | 1999-08-06 | Canon Inc | Optical spatial communication equipment |
| JP2001349943A (en) * | 2000-06-06 | 2001-12-21 | Hitachi Ltd | Laser range finder, laser range finding method, and measuring device |
| CN103412313A (en) * | 2013-07-30 | 2013-11-27 | 桂林理工大学 | Small low-altitude light area array laser radar measuring system |
| CN103941263A (en) * | 2014-04-28 | 2014-07-23 | 北京控制工程研究所 | Inter-satellite ranging method based on quantum light sources on satellites and reflector |
| CN107167813A (en) * | 2017-05-19 | 2017-09-15 | 深圳市瑞大科技有限公司 | Optical radar |
| CN208207215U (en) * | 2018-06-20 | 2018-12-07 | 中核(天津)科技发展有限公司 | Small space point type laser ranging system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108919287A (en) | 2018-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9971024B2 (en) | Lidar scanner calibration | |
| US9417326B2 (en) | Pulsed light optical rangefinder | |
| CN110609267B (en) | Laser radar system and anti-interference method thereof | |
| US20240061091A1 (en) | Method for measuring reflectivity of target object by using lidar, and lidar | |
| CN112305519B (en) | Laser radar rapid detection system based on silicon photomultiplier | |
| CN109696690A (en) | Time-of-flight sensor and its luminous detection method | |
| WO2023103310A1 (en) | Laser radar, and method and system thereof for measuring reflectivity of target | |
| CN110018486A (en) | A kind of multi-beam laser range sensor based on TOF | |
| CN207408584U (en) | Rangefinder based on LED light source | |
| CN108919287B (en) | Point type laser ranging device and method for narrow space | |
| CN114442109B (en) | Large dynamic range hybrid solid-state laser radar system based on transceiver array module | |
| CN209656893U (en) | A kind of pulse type laser radar system | |
| WO2019033270A1 (en) | Laser distance measuring device and method of use thereof | |
| CN114488173A (en) | Distance detection method and system based on flight time | |
| CN117991395A (en) | Photoelectric sensor detection circuit and detection equipment | |
| WO2023186057A1 (en) | Laser radar detection parameter adjustment control method and device | |
| CN211717753U (en) | External field performance testing device for photoelectric instrument | |
| CN208207215U (en) | Small space point type laser ranging system | |
| CN115792938A (en) | Distance measuring method and device with error compensation function and depth sensor | |
| CN107515389B (en) | High-precision calibration system for satellite-borne laser radar detector | |
| CN114236504A (en) | dToF-based detection system and light source adjusting method thereof | |
| CN215769022U (en) | High-sensitivity laser range finder | |
| CN215678765U (en) | Hybrid TOF sensor system | |
| CN218331976U (en) | High-precision measuring circuit suitable for semiconductor laser ranging | |
| CN221261237U (en) | Dual wavelength laser ranging sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |