CN108008399A - A kind of hand-held laser ranging system and its method - Google Patents
A kind of hand-held laser ranging system and its method Download PDFInfo
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- CN108008399A CN108008399A CN201610961755.7A CN201610961755A CN108008399A CN 108008399 A CN108008399 A CN 108008399A CN 201610961755 A CN201610961755 A CN 201610961755A CN 108008399 A CN108008399 A CN 108008399A
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Classifications
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- 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
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a kind of hand-held laser ranging system and its method, belong to laser measuring technique field.The hand-held laser ranging system includes a display screen, one transmitter unit, one receiving unit, one processor unit, the display screen is used for the metrical information and/or status information for showing the hand-held laser ranging system, the transmitter unit is used to launch laser, the receiving unit is used to receive reflection laser, the processor unit is used to draw metrical information, it is characterized in that, the hand-held laser ranging system has an ambient light sensor, for environment-identification luminous intensity, the ambient light intensity that the processor unit is identified according to the ambient light sensor adjusts the laser power that the transmitter unit is launched.The hand-held laser ranging system and its method are the Strength Changes based on ambient light, change laser emitting power, so as to improve the outdoor measurement capability of hand-held laser ranging system.
Description
Technical field
The present invention relates to the technical field using radio wave measurement distance, more particularly to apply the hand-held laser of laser
Range unit and its method.
Background technology
Laser range finder (Laser Distance Measuring Instrument) is to mesh using laser as light source
The instrument that subject distance measures, rangefinder launch beam of laser to object at work, mesh are received by photoelectric receiving device
The laser signal of reflection is marked, by measuring time difference from Laser emission to reception or phase difference, is calculated from being transmitted to mesh
Target distance value.Laser range finder is more subject to civilian, military and industrial in fields such as length, height, distance, speed, shapes
Etc. the attention of industry, it has been widely used in multiple fields at present, such as major industrial and mining enterprises, electric power petrochemical industry, water conservancy, communication,
Environment, building, geology, police service, fire-fighting, explosion, navigation, railway is military, scientific research institution, agricultural, forestry, real estate, leisure,
Outdoor sports etc..
Laser ranging product can be roughly divided into four classes according to operation principle：Phase laser distance measurement instrument, pulse type laser are surveyed
Distance meter, trigonometry laser range finder and laser interferometer.Triangle measurement method instrument and laser interferometer be generally used for microspur measurement and
High-acruracy survey, therefore common hand-hold ranger is all based on phase type or pulsed, wherein phase distancemeter precision
High (submillimeter level), range are short (within general 200 meters), and pulsed measurement accuracy is slightly worse (centimetre rank), and range is larger (maximum
Range is up to kilometer rank).
Phase laser distance measurement instrument is generally based on continuous wave measurement method, and Laser emission is the sine wave through ovennodulation
Signal, after being irradiated to target, the part signal that reflects is photoelectrically converted device reception, after conditioning, locates in rangefinder
Reason unit calculates range information according to information such as the frequency of laser signal and phase differences, due to the continuous wave measurement that it is used,
And limited be subject to relevant laser safety standard, laser power is no more than 1mW, therefore this kind of rangefinder is generally used for interior
Measurement and close-in measurement.
Laser range finder particularly phase distancemeter is in outdoor measurement, when ambient light is stronger, the tune that reflects
Signal processed can be submerged in ambient light noise, so as to can not normally measure.
In view of this, a kind of new hand-held laser ranging system how is designed, to eliminate drawbacks described above of the prior art
And deficiency, it is the problem that related technical personnel are urgently to be resolved hurrily in the industry.
The content of the invention
In order to overcome the technical problem of Hand-hold Distance Finder in the prior art, the present invention provides a kind of hand-held Laser Measuring
Away from devices and methods therefor, it can change according to ambient light intensity, rationally adjust laser emitting power, change modulated signal transmitting
Intensity, reduces the interference of ambient light noise, improves the signal-to-noise ratio of reception, and then improve the outdoor measurement energy of laser ranging system
Power.
In order to realize foregoing invention purpose, the invention discloses a kind of hand-held laser ranging system, the hand-held Laser Measuring
Include a display screen, a transmitter unit, a receiving unit, a processor unit away from device, the display screen is used to show described
The metrical information and/or status information of hand-held laser ranging system, the transmitter unit are used to launch laser, the receiving unit
For receiving reflection laser, the processor unit is used to draw metrical information, it is characterised in that the hand-held laser ranging dress
Putting has an ambient light sensor, and for environment-identification luminous intensity, the processor unit is according to the ambient light sensor institute
The ambient light intensity of identification adjusts the laser power of the transmitter unit transmitting.
Further, the ambient light sensor is built in the receiving unit.
Further, the ambient light sensor is arranged in an optical-electric module, which is placed outside described connect
Receive unit.
Further, the ambient light sensor is a photoelectric sensor, and the hand-held laser ranging system at least has
There is a photoelectric sensor.
Further, the photoelectric sensor is photodiode or photo resistance or avalanche photodide.
Further, the hand-held laser ranging system has a reminding unit, and the reminding unit is a buzzer
Or an a display icon or light emitting diode, reminded when launching high power laser light for transmitter unit.
Meanwhile in order to realize foregoing invention purpose, the invention also discloses a kind of hand-held laser distance measurement method, ambient light passes
Sensor obtains environment-identification luminous intensity, and transmitter unit adjusts transmitting laser power according to the ambient light intensity.
Further, the hand-held laser distance measurement method is further comprising the steps of：
A range units start measurement, transmitter unit transmitting laser signal, and receiving unit receives reflected laser signals, locates
Measuring signal and status signal are launched to processor unit after reason；
B processor unit reception state signals, and by analyzing the change of status signal, judge current environment luminous intensity；
C judges whether current environment luminous intensity exceeds default ambient light intensity threshold value；
If d current environments luminous intensity uses factory default laser without departing from default ambient light intensity threshold value, transmitter unit
Transmission power carries out Laser emission；
If e current environments luminous intensity exceeds default ambient light intensity threshold value, and to automatically switch to transmitting laser work(
Rate enhancement mode, then adjust automatically laser emitting power；
If f current environments luminous intensity exceeds default ambient light intensity threshold value, and switches to transmitting laser to be non-automatic
Power enhancement mode, display alarm user enters the information of enhancement mode on display screen, and user is chosen whether by function button
Enable enhancement mode.
Further, the hand-held laser distance measurement method is further comprising the steps of：
A range units start measurement, transmitter unit transmitting laser signal, and receiving unit receives reflected laser signals, ring
Border optical sensor environment-identification luminous intensity, receiving unit and ambient light sensor respectively by measuring signal and status signal launch to
Processor unit；
B processor unit reception state signals, and by analyzing the change of status signal, judge current environment luminous intensity；
C judges whether current environment luminous intensity exceeds default ambient light intensity threshold value；
If d current environments luminous intensity uses factory default laser without departing from default ambient light intensity threshold value, transmitter unit
Transmission power carries out Laser emission；
If e current environments luminous intensity exceeds default ambient light intensity threshold value, and to automatically switch to transmitting laser work(
Rate enhancement mode, then adjust automatically laser emitting power；
If f current environments luminous intensity exceeds default ambient light intensity threshold value, and switches to transmitting laser to be non-automatic
Power enhancement mode, display alarm user enters the information of enhancement mode on display screen, and user is chosen whether by function button
Enable enhancement mode.
Further, after completing ranging under enhancement mode, laser signal recovers to normal power mode automatically immediately.
Further, after completing ranging under enhancement mode, when laser is opened in laser ranging next time, laser signal is automatic
Recover to normal power mode.
Further, there are linear relationship between laser power and ambient light intensity under enhancement mode.
Compared with prior art, technical solution provided by the present invention has the following advantages：Firstth, can be according to environment
Intensity variation, rationally adjusts laser emitting power, changes modulated signal emissive porwer, reduces the interference of ambient light noise, carry
The signal-to-noise ratio that height receives, and then improve the outdoor measurement capability of laser ranging system；Secondth, there is high power to remind, works as laser
For high power, high power when, user is reminded by display screen and/or buzzer, avoids laser beam irradiation eyes or other meetings
The article injured.
Brief description of the drawings
It can be obtained further by following detailed description of the invention and institute's accompanying drawings on the advantages and spirit of the present invention
Solution.
Fig. 1 is the structure diagram of hand-held laser ranging system provided by the present invention；
Fig. 2 is the partial circuit schematic diagram of receiving unit in Fig. 1；
Fig. 3 is the structure diagram of another hand-held laser ranging system provided by the present invention；
Fig. 4 is the flow chart of hand-held laser distance measurement method provided by the present invention.
Embodiment
The specific embodiment that the invention will now be described in detail with reference to the accompanying drawings.However, the present invention should be understood as to not office
It is limited to this embodiment described below, and the technical concept of the present invention can be with other known technologies or function and those
The identical other technologies combination of known technology is implemented.
In the explanation of specific examples below, of the invention structure and working method in order to clearly demonstrate will be by all
Multidirectional word is described, but should by "front", "rear", "left", "right", " outer ", " interior ", " outside ", " inside ",
The Word Understandings such as " axial direction ", " radial direction " are not construed as word of limitation for convenience of term.
It is an object of the invention to provide a kind of hand-held laser ranging system and its method, pass through the detection of ambient light, ring
The prompting of border luminous intensity, the control of laser power, the prompting of laser power, realize and are changed according to ambient light intensity, rationally adjustment
Laser emitting power, changes modulated signal emissive porwer, reduces the interference of ambient light noise, improve the signal-to-noise ratio of reception, and then
Improve the outdoor measurement capability of laser ranging system.
The 1-4 specific embodiments that the present invention will be described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the structure diagram of Hand-hold Distance Finder provided by the present invention.As shown in the figure, hand provided by the invention
Holding laser ranging system includes display screen 1, power supply unit 2, processor unit 3, button 4, transmitter unit 5, receiving unit 6, bee
Ring device 7, wherein, display screen 1 is used to show the current functional information of measurement result, measuring state, rangefinder, state prompting message
Deng when such as launching high power laser light, by showing that a certain special icon shows warning message；Buzzer 7 is mainly used for state and carries
Wake up, when the transmitting laser of hand-held laser ranging system is high power laser light, i.e., laser enhancing pattern, buzzer 7 send buzzing
Sound is accused with warning, and avoids laser beam irradiation eyes or other articles that can be injured；Power supply unit 2 is used to provide for rangefinder
Suitable working power；Processor unit 3 mainly includes micro-control unit (MCU) and its accessory circuit, is the main control part of system
Point, the transmitting laser power that its status signal launched according to receiving unit 6 control adjustment transmitter unit 5 is sent；Button 4 is used for
User is provided and inputs information to the approach of processor unit 3；Transmitter unit 5 is used for the modulation and transmitting for completing signal；Receive
Unit 6, its built-in ambient light sensor, receiving unit 6 are used to receive reflection laser and environment-identification luminous intensity, will be surveyed after processing
Amount signal and status signal are transferred to processor unit 3.
In addition, those of ordinary skill in the art should know, the hand-held laser ranging system is sent out for transmitter unit
The reminding unit reminded during high power laser light is penetrated, in addition to buzzer and special icon, can also be a light-emitting diodes
Pipe.User opens laser when in use, by button 4, and transmitter unit 5 launches laser, after laser spots are aimed at target to be measured, uses
The measurement of the hand-held laser ranging system is triggered at family again by button 4, and measurement result is shown on display screen 1 immediately.Measurement
After, if being this time measured as the measurement completed under laser enhancing pattern, transmitting laser can be at the end of this measurement immediately
Recover transmitting laser to normal power, also or transmitting laser is when laser is opened in measurement next time, recovers to normal power.When
When user presses the button for opening laser and completing measurement, buzzer can beep.
Hand-held laser ranging system provided by the present invention, its receiving unit 6 pass through internal receiving sensor (ambient light
Sensing and receiving sensor are same), environment-identification luminous intensity, so that the laser power level for range unit selection transmitting
Reference is provided, also, there are linear relationship between laser power and ambient light intensity under enhancement mode.The ambient light sensor is
Photoelectric sensor, hand-held laser ranging system can have one or more photoelectric sensors.The photoelectric sensor can be
Photodiode, photo resistance, avalanche photodide (APD) etc..Using APD itself, it not only may be used for electrooptical device
The laser signal Strength Changes of reception are converted to curent change, ambient light can also be converted to noise current.Using only
Vertical photodiode or photo resistance judge ambient light intensity grade, when environmental light intensity changes, photodiode or
Respective change can also occur for the operating current of photodiode, and processor unit 3 can also be counted by obtaining the data of sensor
Calculate current ambient light intensity grade.
Fig. 2 is the partial circuit schematic diagram of the receiving unit in Fig. 1, to illustrate how that the primary mutual conductance using APD is amplified
Signal condition judges ambient light intensity grade.As shown in the figure, two resistance of resistance R1 and R2, the AC signal for APD outputs carries
For direct current central potential, it is ensured that the AC signal after mutual conductance amplification output is located in 0-VCC voltage ranges；R3 and C2 composition low passes
Wave filter, so that the direct current signal Vs1 that the AC signal programming of mutual conductance output is stable, there is provided adopted to processor unit
Collection；The signal of mutual conductance amplification, as the initial AC signal of two level enhanced processing, eventually becomes demodulation after the processing of C1 blockings
Signal S1 is supplied to processor unit to gather；Rf is transconductance feedback resistance, determines the amplification coefficient of mutual conductance amplifying circuit；Electric current
Iin is the output average current of APD, when it flows through mutual conductance resistance Rf, can produce corresponding pressure drop.
According to the principle of operational amplifier, it can be deduced that the voltage of Vs1 and the relation of Iin are as follows：
When ambient light relatively becomes strong, the average output current Iin of APD becomes larger, then Vs1 diminishes, can be with by bulge test
Ambient light and the relation of Vs1 are counted, and then by the change of Vs1, can draw the strength grade of current environment light.
Fig. 3 is the structure diagram of another hand-held laser ranging system provided by the present invention.What is shown in Fig. 3 is hand-held sharp
Optical range finding apparatus is that ambient light sensor is not built in and connects with the hand-held laser ranging system difference shown in Fig. 1
Receive in unit, but the optical-electric module 11 independent as one, it is placed outside receiving unit.Other parts are identical, and so it will not be repeated.
Fig. 4 is the flow chart of hand-held laser distance measurement method provided by the present invention.As shown in figure 4, hand provided by the invention
Laser distance measurement method is held to comprise the following steps：
S01 starts measurement operation
The photoelectric sensor of S02 receiving units obtains ambient light state, emission state signal to processor unit
S03 processor unit reception state signals, to judge the strength grade of ambient light and show on a display screen
S04 judges whether ambient light intensity has exceeded default threshold value
S05 is held laser ranging system and is sent out using factory default laser when ambient light intensity is without departing from default threshold value
Penetrate the transmitting that power carries out laser；
S06 when ambient light intensity is beyond default threshold value, further determine whether be automatic start enhancement mode with
Into outdoor measurement pattern, i.e. enhancing transmitting laser power, if automatic start enhancement mode, then present mode is reminded as enhancing
Pattern, a successive step laser emitting power of going forward side by side；If not automatic start enhancement mode, user is reminded to need to open enhancing mould
Formula carries out ranging, and user by function button manually set and chooses whether to take enhancement mode.It is arranged to take when manually
Enhancement mode, then prompting present mode is enhancement mode, a successive step laser emitting power of going forward side by side；It is arranged to not take when manually
Enhancement mode, then hold the transmitting that laser ranging system carries out laser using factory default laser emitting power；
S07 carries out laser ranging
After S08 completion rangings or when carrying out the opening laser of ranging next time, normal power mode is switched to or rests on,
That is transmitting laser power is recovered to factory default laser emitting power
Compared with prior art, hand-held laser ranging system provided by the present invention and its method have the following advantages：
Firstth, it can be changed according to ambient light intensity, rationally adjust laser emitting power, change modulated signal emissive porwer, reduce ring
The interference of border optical noise, improves the signal-to-noise ratio of reception, and then improves the outdoor measurement capability of laser ranging system；Secondth, have
High power is reminded, and when laser is high power, high power, is reminded user by display screen and/or buzzer, is avoided laser beam from shining
Penetrate eyes or other articles that can be injured.
Unless otherwise instructed, it is herein presented be similar to " first ", the qualifier of " second " do not mean that it is suitable to the time
The restriction of sequence, quantity or importance, and be used for the purpose of a technical characteristic in the technical program and another technology
Feature is mutually distinguished.Similarly, the herein presented qualifier similar to " one " does not mean that the restriction to quantity, but describes
The technical characteristic not occurred above.Similarly, occur herein before number be similar to " about ", " approx "
Modifier generally comprises this number, and its specific implication should combine context meaning and understand.Similarly, only have specific
The noun of quantity measure word modification, otherwise should be regarded as including plural form again comprising singulative, in the technology herein
It can include a technical characteristic of odd number in scheme, a plurality of technical characteristics can also be included.
The preferred embodiment of the simply present invention described in this specification, above example is only illustrating the present invention
Technical solution rather than limitation of the present invention.All those skilled in the art pass through logic analysis, reasoning under this invention's idea
Or the limited available technical solution of experiment, all should be within the scope of the present invention.
Claims (12)
1. a kind of hand-held laser ranging system, the hand-held laser ranging system includes a display screen, a transmitter unit, a reception
Unit, a processor unit, the display screen are used for the metrical information for showing the hand-held laser ranging system and/or state letter
Breath, the transmitter unit are used to launch laser, and the receiving unit is used to receive reflection laser, and the processor unit is used for
Go out metrical information, it is characterised in that the hand-held laser ranging system has an ambient light sensor, for environment-identification light intensity
Degree, the ambient light intensity that the processor unit is identified according to the ambient light sensor adjust what the transmitter unit was launched
Laser power.
2. hand-held laser ranging system as claimed in claim 1, it is characterised in that the ambient light sensor is built in described
In receiving unit.
3. hand-held laser ranging system as claimed in claim 1, it is characterised in that the ambient light sensor is arranged at a light
In electric module, which is placed outside the receiving unit.
4. hand-held laser ranging system as claimed in claim 1, it is characterised in that the ambient light sensor is a photoelectric transfer
Sensor, the hand-held laser ranging system at least have a photoelectric sensor.
5. hand-held laser ranging system as claimed in claim 4, it is characterised in that the photoelectric sensor is photodiode
Or photo resistance or avalanche photodide.
6. hand-held laser ranging system as claimed in claim 1, it is characterised in that the hand-held laser ranging system has one
Reminding unit, the reminding unit are a buzzer or a display icon or a light emitting diode, are launched for transmitter unit
Reminded during high power laser light.
7. a kind of hand-held laser distance measurement method, it is characterised in that ambient light sensor obtains environment-identification luminous intensity, transmitter unit
Transmitting laser power is adjusted according to the ambient light intensity.
8. hand-held laser distance measurement method as claimed in claim 7, it is characterised in that the hand-held laser distance measurement method further include with
Lower step：
A range units start measurement, and transmitter unit transmitting laser signal, receiving unit receives reflected laser signals, after processing
Measuring signal and status signal are launched to processor unit；
B processor unit reception state signals, and by analyzing the change of status signal, judge current environment luminous intensity；
C judges whether current environment luminous intensity exceeds default ambient light intensity threshold value；
If d current environments luminous intensity uses factory default Laser emission without departing from default ambient light intensity threshold value, transmitter unit
Power carries out Laser emission；
If e current environments luminous intensity exceeds default ambient light intensity threshold value, and increases to automatically switch to transmitting laser power
Strong mode, then adjust automatically laser emitting power；
If f current environments luminous intensity exceeds default ambient light intensity threshold value, and switches to transmitting laser power to be non-automatic
Enhancement mode, display alarm user enters the information of enhancement mode on display screen, and user chooses whether to enable by function button
Enhancement mode.
9. hand-held laser distance measurement method as claimed in claim 7, it is characterised in that the hand-held laser distance measurement method further include with
Lower step：
A range units start measurement, transmitter unit transmitting laser signal, and receiving unit receives reflected laser signals, ambient light
Sensor environment-identification luminous intensity, receiving unit and ambient light sensor respectively launch measuring signal and status signal to processing
Device unit；
B processor unit reception state signals, and by analyzing the change of status signal, judge current environment luminous intensity；
C judges whether current environment luminous intensity exceeds default ambient light intensity threshold value；
If d current environments luminous intensity uses factory default Laser emission without departing from default ambient light intensity threshold value, transmitter unit
Power carries out Laser emission；
If e current environments luminous intensity exceeds default ambient light intensity threshold value, and increases to automatically switch to transmitting laser power
Strong mode, then adjust automatically laser emitting power；
If f current environments luminous intensity exceeds default ambient light intensity threshold value, and switches to transmitting laser power to be non-automatic
Enhancement mode, display alarm user enters the information of enhancement mode on display screen, and user chooses whether to enable by function button
Enhancement mode.
10. hand-held laser distance measurement method as claimed in claim 8 or 9, it is characterised in that after completing ranging under enhancement mode,
Laser power is recovered to normal power mode automatically immediately.
11. hand-held laser distance measurement method as claimed in claim 8 or 9, it is characterised in that after completing ranging under enhancement mode,
When laser is opened in laser ranging next time, laser signal recovers to normal power mode automatically.
12. hand-held laser distance measurement method as claimed in claim 7, it is characterised in that laser power and environment under enhancement mode
There are linear relationship between luminous intensity.
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| CN111077584A (en) * | 2018-10-19 | 2020-04-28 | 北京天乐泰力科技发展有限公司 | Filtering processing method for laser correlation device |
| WO2020087376A1 (en) * | 2018-10-31 | 2020-05-07 | 深圳市大疆创新科技有限公司 | Light detection method, light detection device, and mobile platform |
| WO2022194903A1 (en) * | 2021-03-18 | 2022-09-22 | Robert Bosch Gmbh | Method for operating a lidar system |
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