CN201514481U - Laser range finder - Google Patents
Laser range finder Download PDFInfo
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- CN201514481U CN201514481U CN2009202360769U CN200920236076U CN201514481U CN 201514481 U CN201514481 U CN 201514481U CN 2009202360769 U CN2009202360769 U CN 2009202360769U CN 200920236076 U CN200920236076 U CN 200920236076U CN 201514481 U CN201514481 U CN 201514481U
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Abstract
The utility model relates to a laser range finder which comprises a power supply system, a laser module and a control system, wherein the power supply system is connected with the laser module and the control system and supplies power to the laser module and the control system; and the laser range finder is characterized in that the laser module adopts a phase-difference type range-finding laser module. By adopting the phase-difference type range-finding method, the laser range finder is suitable for short-range positioning, high range-finding precision and diversified output methods.
Description
Technical field
The utility model relates to industrial automation control, specifically is a kind of mechanism's stadimeter that engineering is accurately measured etc. that is used for.
Background technology
In laser ranging field two kinds of main method are arranged, pulsed and phase-difference type, and traditional laser ranging mostly is the pulsed range finding, measuring distance is generally more than 100m, and error is bigger, measuring accuracy mostly is " cm " order of magnitude greatly, and in-plant linear measure longimetry is then had certain limitation, can not accurately measure not even energy measurement.
Summary of the invention:
Measure the inaccurate and bigger problem of error for solve the low coverage that classic method exists in laser measurement closely, the utility model provides a laser range finder, and concrete technical scheme is:
A kind of laser range finder comprises electric power system, laser module and control system; Described electric power system connects the laser module and control system is they power supplies, it is characterized in that described laser module is a phase-difference type range finding laser module.
Described control system comprises microprocessor, display module and peripheral output circuit; The output terminal of microprocessor connects display module and peripheral output circuit.Described peripheral output circuit comprises NPN switching value output circuit, PNP switching value output circuit, aanalogvoltage output circuit and analog current output circuit.Display module comprises led state display module and LCD MODULE.
Described electric power system is the DC/DC change-over circuit, the input end external direct current power supply of DC/DC change-over circuit, and the output terminal of DC/DC change-over circuit connects laser module and control system.
Described phase-difference type range finding laser module comprises light source, modulator, master oscillator, optical emitting/receiving system, photoelectric commutator, phase measurement meter, master oscillator, local oscillator, reference signal frequency mixer and distance measuring signal frequency mixer;
The output terminal of described main signal oscillator connects modulator, and the output terminal of modulator is connected with light source, and the light wave behind the carrier wave is through the emission of optical emitting system; Wherein a part of light wave passes to optical receiving system through interior light path, and another part light wave passes to optical receiving system through outer light path, and two parts light wave imports photoelectric commutator into; The output terminal of described photoelectric commutator connects the input end of distance measuring signal frequency mixer, and the input end of distance measuring signal frequency mixer also connects the output terminal of local oscillator; The output terminal of described distance measuring signal frequency mixer connects the input end of phase measurement meter through amplifying circuit;
The input end of described reference signal frequency mixer connects the output terminal of master oscillator and local oscillator, and the output terminal of reference signal frequency mixer connects the input end of phase measurement meter through selective frequency amplifier circuit;
Described photoelectric commutator is a photomultiplier, and described photomultiplier front end is provided with continuous attenuator.
The principle of this stadimeter is as follows:
Modulating wave emission and return after be high-frequency signal, carry out the photoelectricity mixing through the distance measuring signal frequency mixer, obtaining a low frequency distance measuring signal after amplifying through frequency-selecting.This low frequency distance measuring signal has still kept the original phase delay of high frequency distance measuring signal.In order to carry out than phase, the part of the main high frequency distance measuring signal that shakes is called reference signal and the local oscillator high-frequency signal is sent into the reference signal frequency mixer simultaneously, after the frequency-selecting amplification, obtain can be used as low frequency reference signal than phase benchmark, because this low frequency reference signal does not have through coming and going the distance of survey line, so there is not phase delay in this low frequency reference signal.Therefore, low frequency distance measuring signal and low frequency reference signal are sent into the phase measurement meter simultaneously and are adopted numeral to survey mutually technology to carry out the phase bit comparison, arithmetical unit passes to microprocessor by calculating with phase differential with this phase delay, by microprocessor this variation is converted to the transmission range of light wave and does corresponding demonstration or output.
The phase type range finding adopts light wave as carrier wave, make the amplitude of carrier wave or frequency do cyclical variation by a modulator according to the variation of modulating wave, during range finding, on testing distance, come and go the phase change that propagation is produced by measuring modulating wave, indirect definite travel-time, and then try to achieve testing distance.The utility model adopts many chis to measure, promptly adopt to same distance carry out repeatedly, different modulated light wave (these modulated light waves then are referred to as the light chi or survey chi) measures, again the data that record are combined, with long survey chi (being auxiliary chi or the bigness scale survey chi surveyed again) bigness scale, with short survey chi (being basic chi or the accurate measurement survey chi surveyed again) accurate measurement, so both can guarantee the determinacy (monambiguity) measured can guarantee higher measuring accuracy again.
The master of this stadimeter shake and two parts of local oscillator in also produce the oscillation frequency of one group of bigness scale chi, i.e. master oscillator frequenc and local frequency.As previously mentioned,, the result combinations of accurate measurement chi and one group of bigness scale chi is got up, just can obtain the numerical value of whole testing distance if carry out same measurement with bigness scale chi frequency.
Modulator, modulator have that modulation band is wide, modulation voltage is lower and phase uniformity advantage preferably, and its effect is that distance measuring signal is loaded on the light wave, and radiative amplitude is changed with distance measuring signal voltage, becomes a kind of modulated light wave.
In addition, increased photomultiplier at light receiving part, multiplier tube is a kind of extremely sensitive high-gain electrooptical device, it is except converting light signal the electric signal to, can also carry out powerful amplification to electric signal, have very high sensitivity, enlargement factor reaches 10
6～10
7The order of magnitude.Also be provided with a continuous attenuator in the multiplier tube front,, can cause cathode fatigue and damage so as to avoiding the negative electrode of strong illumination multiplier tube simultaneously, play a protective role so that regulate the size of the light intensity that enters by the distance of distance.
The Laser Modulation frequency that certain survey chi length is corresponding certain, be called modulation frequency again, many chis adopt one group of modulating frequency that numerical value is close when measuring, by measuring the phase place mantissa of each modulation frequency, and get the mantissa that its difference is come the corresponding difference frequency frequency of indirect determination, high-frequency signal is converted into low frequency signal (i.e. " synchronous demodulation "), carries out phase difference measurement again, Here it is so-called " difference frequency survey phase ".
The utility model utilizes difference frequency to survey phase, all sends when each range finding and the modulated light wave of three different frequencies of sampling, and promptly three surveying chis, thereby guaranteed precision ranging, measurement range 0～20m, error control makes the low coverage measurement reach a new height about 1mm; In addition, the emission of the laser instrument of this novel employing be red laser, better utilization laser beam divergence little, be not subjected to advantage such as sunshine interference to realize accurate location.
The utility model provides real-time distance display of liquid crystal panel and function output to show aspect demonstration; convenience and wieldy button; be convenient to regulate various functions; in function output; NPN/PNP is provided each way switch amount output; have overload protection function, and the simulating signal output of 0～10V aanalogvoltage and 0～20mA analog current is provided, and this simulation output has the characteristic that is directly proportional with measuring distance.
The utility model adopts the phase-difference type measuring method, is positioned closely precision ranging, and 0～20m distance about error 1mm, and provides switching value and analog quantity output.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
A kind of laser range finder comprises electric power system, laser module and control system; Described electric power system connects the laser module and control system is they power supplies, it is characterized in that described laser module is a phase-difference type range finding laser module.
Described control system comprises microprocessor, display module and peripheral output circuit; The output terminal of microprocessor connects display module and peripheral output circuit.Display module comprises led state display module and LCD MODULE.Described peripheral output circuit comprises NPN switching value output circuit, PNP switching value output circuit, aanalogvoltage output circuit and analog current output circuit.
Described electric power system is the DC/DC change-over circuit, the input end external direct current power supply of DC/DC change-over circuit, and the output terminal of DC/DC change-over circuit connects laser module and control system.
Described phase-difference type range finding laser module comprises light source (this routine light source is the red laser transmitter), modulator, master oscillator, optical emitting/receiving system, photoelectric commutator, phase measurement meter, master oscillator, local oscillator, reference signal frequency mixer and distance measuring signal frequency mixer.
The output terminal of described main signal oscillator connects modulator, and the output terminal of modulator is connected with light source, and the light wave behind the carrier wave is through the emission of optical emitting system; Wherein a part of light wave passes to optical receiving system through interior light path, and another part light wave passes to optical receiving system through outer light path, and two parts light wave imports photoelectric commutator into; The output terminal of described photoelectric commutator connects the input end of distance measuring signal frequency mixer, and the input end of distance measuring signal frequency mixer also connects the output terminal of local oscillator; The output terminal of described distance measuring signal frequency mixer connects the input end of phase measurement meter through amplifying circuit; The input end of described reference signal frequency mixer connects the output terminal of master oscillator and local oscillator, and the output terminal of reference signal frequency mixer connects the input end of phase measurement meter through selective frequency amplifier circuit.
Described photoelectric commutator is a photomultiplier, and described photomultiplier front end is provided with continuous attenuator.
The electric power system input end adopts external direct current supply, supports the antipole protection, built-in DC/DC change-over circuit, output DC3.3V.This 3.3V is master element power supply of the present utility model, and power input voltage is laser module and output terminal power supply after voltage stabilizing.
The laser module is made up of light source, modulator, master oscillator, optical emitting and receiving system, phase measurement meter, oscillator and various signal mixers etc.By light wave that light source sent (infrared light or laser, this example adopts laser), enter modulator after, modulated from the high frequency distance measuring signal of master oscillator (being called for short main shaking), become modulated wave.This modulated wave enters receiver through outer light path, is focused on the photoelectric device, and light signal is converted into electric signal immediately.This electric signal is exactly that modulated wave is travelled to and fro between behind the survey line high frequency distance measuring signal through demodulation, this high frequency distance measuring signal with carry out the photoelectricity mixing from the high-frequency signal of local oscillator (abbreviation local oscillator) through the distance measuring signal frequency mixer, obtaining a low frequency distance measuring signal after amplifying through frequency-selecting.This low frequency distance measuring signal has still kept the original phase delay of high frequency distance measuring signal.In order to carry out than phase, the part of the main high frequency distance measuring signal that shakes is called reference signal and the local oscillator high-frequency signal is sent into the reference signal frequency mixer simultaneously, after the frequency-selecting amplification, obtain can be used as low frequency reference signal than phase benchmark, because this low frequency reference signal does not have through coming and going the distance of survey line, so there is not phase delay in this low frequency reference signal.Therefore, low frequency distance measuring signal and the low frequency reference signal phasometer of making a gift to someone simultaneously adopts numeral to survey mutually technology to carry out the phase bit comparison, arithmetical unit passes to microprocessor by calculating with phase differential with this phase delay, by microprocessor this variation is converted to the transmission range of light wave and does corresponding demonstration or output.
The master of phase distancemeter shake and two parts of local oscillator in also comprise the oscillation frequency of one group of bigness scale chi, i.e. master oscillator frequenc and local frequency.As previously mentioned,, the result combinations of accurate measurement chi and one group of bigness scale chi is got up, just can obtain the numerical value of whole testing distance if carry out same measurement with bigness scale chi frequency.
Modulator, modulator have that modulation band is wide, modulation voltage is lower and phase uniformity advantage preferably, and its effect is that distance measuring signal is loaded on the light wave, and radiative amplitude is changed with distance measuring signal voltage, becomes a kind of modulated light wave.
In addition, increased photomultiplier at light receiving part, multiplier tube is a kind of extremely sensitive high-gain electrooptical device, it is except converting light signal the electric signal to, can also carry out powerful amplification to electric signal, have very high sensitivity, enlargement factor reaches 10
6～10
7The order of magnitude.Also be provided with a continuous attenuator in the multiplier tube front,, can cause cathode fatigue and damage so as to avoiding the negative electrode of strong illumination multiplier tube simultaneously, play a protective role so that regulate the size of the light intensity that enters by the distance of distance.
Control system: mainly by microprocessor and peripheral output control; holding circuit is formed; microprocessor is connected with the laser module by serial ports; be set to 9600 baud rate; the fiducial value of acquisition phase meter also calculates corresponding results; relevant numerical value is carried out man-machine interaction by display panel; be included on the display panel real-time demonstration to measuring distance and function; and control correlative output; the way of output comprises each one group switching value output (overload protection function is all arranged) of NPN/PNP; the simulating signal output of one group of 0～10V aanalogvoltage and 0～20mA analog current; this simulation output has the characteristic that is directly proportional with measuring distance; and various outputs all have the window output function, and far point and near point can be provided with.Described NPN switching value output circuit, PNP switching value output circuit, aanalogvoltage output circuit and analog current output circuit are often seen in the prior art, are not further limited at this.
The utility model utilizes difference frequency to survey phase, all sends when each range finding and the modulated light wave of three different frequencies of sampling, and namely three surveying chis, thereby guaranteed precision ranging, measurement category 0～20m, error is controlled at about 1mm, makes the low coverage measurement reach a new height; In addition, the laser instrument emission that this example adopts be red laser, better utilized laser beam divergence little, be not subjected to the advantage such as sunshine interference to realize accurate location.
Claims (8)
1. a laser range finder comprises electric power system, laser module and control system; Described electric power system connects the laser module and control system is they power supplies, it is characterized in that described laser module is a phase-difference type range finding laser module.
2. laser range finder according to claim 1 is characterized in that described control system comprises microprocessor, display module and peripheral output circuit; The output terminal of microprocessor connects display module and peripheral output circuit.
3. laser range finder according to claim 1 is characterized in that described electric power system is the DC/DC change-over circuit, the input end external direct current power supply of DC/DC change-over circuit, and the output terminal of DC/DC change-over circuit connects laser module and control system.
4. laser range finder according to claim 1 is characterized in that described phase-difference type range finding laser module comprises light source, modulator, master oscillator, optical emitting/receiving system, photoelectric commutator, phase measurement meter, master oscillator, local oscillator, reference signal frequency mixer and distance measuring signal frequency mixer;
The output terminal of described main signal oscillator connects modulator, and the output terminal of modulator is connected with light source, and the light wave behind the carrier wave is through the emission of optical emitting system; Wherein a part of light wave passes to optical receiving system through interior light path, and another part light wave passes to optical receiving system through outer light path, and two parts light wave imports photoelectric commutator into; The output terminal of described photoelectric commutator connects the input end of distance measuring signal frequency mixer, and the input end of distance measuring signal frequency mixer also connects the output terminal of local oscillator; The output terminal of described distance measuring signal frequency mixer connects the input end of phase measurement meter through amplifying circuit;
The input end of described reference signal frequency mixer connects the output terminal of master oscillator and local oscillator, and the output terminal of reference signal frequency mixer connects the input end of phase measurement meter through selective frequency amplifier circuit.
5. laser range finder according to claim 4 is characterized in that described photoelectric commutator is a photomultiplier, and described photomultiplier front end is provided with continuous attenuator.
6. laser range finder according to claim 2 is characterized in that display module comprises led state display module and LCD MODULE.
7. laser range finder according to claim 2 is characterized in that described peripheral output circuit comprises NPN switching value output circuit, PNP switching value output circuit, aanalogvoltage output circuit and analog current output circuit
8. laser range finder according to claim 4 is characterized in that described light source is the red laser transmitter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202360769U CN201514481U (en) | 2009-09-23 | 2009-09-23 | Laser range finder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202360769U CN201514481U (en) | 2009-09-23 | 2009-09-23 | Laser range finder |
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| CN201514481U true CN201514481U (en) | 2010-06-23 |
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| CN2009202360769U Expired - Fee Related CN201514481U (en) | 2009-09-23 | 2009-09-23 | Laser range finder |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176021A (en) * | 2011-01-25 | 2011-09-07 | 华中科技大学 | Ranging device based on laser phase method |
| CN102393522A (en) * | 2011-10-24 | 2012-03-28 | 陆建生 | Measuring method of laser range finder and laser range finding apparatus |
| CN102590822A (en) * | 2012-01-10 | 2012-07-18 | 长春理工大学 | Chirped modulation mechanism-based laser radar |
| CN103293532A (en) * | 2013-05-17 | 2013-09-11 | 浙江大学 | Time-sharing phase short-range laser rangefinder and method for improving measurement accuracy |
| CN104635239A (en) * | 2015-03-02 | 2015-05-20 | 金华马卡科技有限公司 | Distance-measuring equipment and distance-measuring method thereof |
| CN105547174A (en) * | 2015-11-27 | 2016-05-04 | 上海无线电设备研究所 | Distributed high-precision laser online measurement system |
| CN106461764A (en) * | 2015-12-10 | 2017-02-22 | 何刚 | Calibration Method and Device Based on Single Wavelength Dual Laser Tube Phase Measurement |
| WO2017096957A1 (en) * | 2015-12-10 | 2017-06-15 | 香港深达威仪器有限公司 | Calibration method based on single-wavelength and double-laser-tube phase measurement, and device thereof |
| CN107015232A (en) * | 2017-03-29 | 2017-08-04 | 许志超 | The device and method of the range measurement of target object is realized using coherent laser difference frequency |
| CN107238367A (en) * | 2017-07-19 | 2017-10-10 | 国网辽宁省电力有限公司丹东供电公司 | Wire is to Adjacent Buildings apart from monitoring and early warning platform |
| CN107270868A (en) * | 2017-07-19 | 2017-10-20 | 国网辽宁省电力有限公司丹东供电公司 | Wire is to Adjacent Buildings distance monitor |
| CN107290754A (en) * | 2017-07-14 | 2017-10-24 | 长春工程学院 | Transmission line wire is to building apart from monitoring system |
| CN109669188A (en) * | 2019-01-17 | 2019-04-23 | 杜鑫 | Mostly along triggered time discrimination method and pulse type laser distance measuring method |
| CN111527417A (en) * | 2018-06-11 | 2020-08-11 | 深圳市镭神智能***有限公司 | Light emitting module, light emitting unit, optical signal detection module, optical system, and laser radar system |
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2009
- 2009-09-23 CN CN2009202360769U patent/CN201514481U/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176021A (en) * | 2011-01-25 | 2011-09-07 | 华中科技大学 | Ranging device based on laser phase method |
| CN102176021B (en) * | 2011-01-25 | 2013-03-27 | 华中科技大学 | Ranging device based on laser phase method |
| CN102393522A (en) * | 2011-10-24 | 2012-03-28 | 陆建生 | Measuring method of laser range finder and laser range finding apparatus |
| CN102393522B (en) * | 2011-10-24 | 2013-10-16 | 陆建生 | Measuring method of laser range finder |
| CN102590822A (en) * | 2012-01-10 | 2012-07-18 | 长春理工大学 | Chirped modulation mechanism-based laser radar |
| CN102590822B (en) * | 2012-01-10 | 2014-02-19 | 长春理工大学 | Chirped modulation mechanism-based laser radar |
| CN103293532A (en) * | 2013-05-17 | 2013-09-11 | 浙江大学 | Time-sharing phase short-range laser rangefinder and method for improving measurement accuracy |
| CN104635239A (en) * | 2015-03-02 | 2015-05-20 | 金华马卡科技有限公司 | Distance-measuring equipment and distance-measuring method thereof |
| WO2016138696A1 (en) * | 2015-03-02 | 2016-09-09 | 金华马卡科技有限公司 | Ranging equipment and ranging method thereof |
| CN105547174A (en) * | 2015-11-27 | 2016-05-04 | 上海无线电设备研究所 | Distributed high-precision laser online measurement system |
| CN106461764A (en) * | 2015-12-10 | 2017-02-22 | 何刚 | Calibration Method and Device Based on Single Wavelength Dual Laser Tube Phase Measurement |
| WO2017096957A1 (en) * | 2015-12-10 | 2017-06-15 | 香港深达威仪器有限公司 | Calibration method based on single-wavelength and double-laser-tube phase measurement, and device thereof |
| CN106461764B (en) * | 2015-12-10 | 2018-08-21 | 何刚 | Calibration method and its device based on Single wavelength bidifly light pipe phase measurement |
| US10782408B2 (en) | 2015-12-10 | 2020-09-22 | Hongkong Sndway Instrument Company Limited | Calibration method and device based on single-wavelength double-laser-tube phase measurement |
| CN107015232A (en) * | 2017-03-29 | 2017-08-04 | 许志超 | The device and method of the range measurement of target object is realized using coherent laser difference frequency |
| CN107290754A (en) * | 2017-07-14 | 2017-10-24 | 长春工程学院 | Transmission line wire is to building apart from monitoring system |
| CN107238367A (en) * | 2017-07-19 | 2017-10-10 | 国网辽宁省电力有限公司丹东供电公司 | Wire is to Adjacent Buildings apart from monitoring and early warning platform |
| CN107270868A (en) * | 2017-07-19 | 2017-10-20 | 国网辽宁省电力有限公司丹东供电公司 | Wire is to Adjacent Buildings distance monitor |
| CN111527417A (en) * | 2018-06-11 | 2020-08-11 | 深圳市镭神智能***有限公司 | Light emitting module, light emitting unit, optical signal detection module, optical system, and laser radar system |
| CN111527417B (en) * | 2018-06-11 | 2023-03-21 | 深圳市镭神智能***有限公司 | Light emitting module, light emitting unit, optical signal detection module, optical system, and laser radar system |
| CN109669188A (en) * | 2019-01-17 | 2019-04-23 | 杜鑫 | Mostly along triggered time discrimination method and pulse type laser distance measuring method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100623 Termination date: 20120923 |