CN104678400A - Ultrasonic ranging system employing pulse counting - Google Patents

Ultrasonic ranging system employing pulse counting Download PDF

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Publication number
CN104678400A
CN104678400A CN201510076337.5A CN201510076337A CN104678400A CN 104678400 A CN104678400 A CN 104678400A CN 201510076337 A CN201510076337 A CN 201510076337A CN 104678400 A CN104678400 A CN 104678400A
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CN
China
Prior art keywords
module
ultrasound wave
counting
ultrasonic
ultrasonic ranging
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.)
Pending
Application number
CN201510076337.5A
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Chinese (zh)
Inventor
叶强
陈伟新
潘琳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Chongan District Technology Innovation Service Center
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Wuxi Chongan District Technology Innovation Service Center
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Wuxi Chongan District Technology Innovation Service Center filed Critical Wuxi Chongan District Technology Innovation Service Center
Priority to CN201510076337.5A priority Critical patent/CN104678400A/en
Publication of CN104678400A publication Critical patent/CN104678400A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S15/00Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06Systems determining the position data of a target
    • G01S15/08Systems for measuring distance only

Abstract

The invention discloses an ultrasonic ranging system employing pulse counting. The ultrasonic ranging system comprises a microcontroller module, and an ultrasonic transmission module, an ultrasonic reception module, a display module and a power supply module that are connected with the microcontroller module, wherein the microcontroller module comprises a counting unit and a data processing unit; the ultrasonic transmission module comprises an oscillator, a constant current transmission circuit, a first instruction transmission circuit and an ultrasonic transmitting probe that are sequentially connected; and the ultrasonic reception module comprises an ultrasonic receiver, an amplifying circuit, a shaping circuit and a second instruction transmission circuit that are sequentially connected. The system employs a 'counting' manner, and the measuring accuracy is greatly improved by calculating the quantity of pulses between a received counting start signal and a counting stop signal transmitted by the ultrasonic transmitting module and the ultrasonic reception module.

Description

A kind of ultrasonic ranging system adopting step-by-step counting
Technical field
The present invention relates to a kind of ultrasonic ranging system, particularly relate to a kind of ultrasonic ranging system adopting step-by-step counting, belong to range finding field.
Background technology
Ultrasound wave is a kind of machinery concussion in elastic medium, and it is that its frequency is at more than 20kHz caused by the concussion source contacted with medium.Because hyperacoustic speed is much smaller relative to the light velocity, its travel-time is just detected than being easier to, and be easy to directional transmissions, good directionality, intensity controls well, thus utilize ultrasonic ranging to have very important purposes in a lot of distance measurement application, comprise Non-Destructive Testing, process measurement, robot measurement and location, and fluid level measurement etc.
Along with expanding economy, transportation is become increasingly prosperous, but is difficult to catch up with due to the hardware such as road condition, traffic administration, add drive overtake other vehicles, principle that to go out that car is deserted, mistake estimates spacing etc. subjective, the traffic hazard of collision is mutually occurred again and again.The essential measure addressed this problem is to install and can find range from motion tracking to the automobile in advancing, self-stopping device in risk distance.
Such as application number is a kind of ultrasonic ranging method of " 201210126584.8 ", belong to electronic measuring technology field, ultrasonic transmitter and pulsed laser are in transmitting terminal, after transmitting terminal receives measuring command, pulsed laser triggers a bundle of pulsed laser, ultrasonic transmitter Triggered ultrasound ripple, is undertaken phase-locked by the ultrasound wave of triggering and external clock reference simultaneously; Ultrasonic receiver and photodiode are in receiving end, after photodiode receives pulse laser, start timer, and after ultrasonic receiver obtains the ultrasound wave received, timer stops, and obtains the transit time; Transit time is multiplied by the revised velocity of sound and obtains tested coarse range measuring value; Obtain phase differential, then accurate measurement part the invention enables receiver not to be subject to transmitter interference for obtaining measured distance, measure blind area greatly to reduce, improve the directive property of supersonic sounding, within distance accuracy being brought up to a ultrasonic wavelength, although this invention can be found range by ultrasound wave, not yet consider the impact of temperature and measuring accuracy needs to be improved further.
And for example application number is a kind of piezoelectric type ultrasonic distance measurement system of " 201210169354.X ", adopts single-chip microcomputer STC12C5202AD to produce ultrasound wave square-wave signal; Adopt hex inverter CD4069 as the pre-driver of emission coefficient and finishing circuit; Adopt integrated circuit CX20106A as the amplification of the signal of receiving system, amplitude limit, bandpass filtering, peak detection and waveform shaping circuit; Software is adopted to control the opening time of ultrasonic transmitter and the opening time of ultrasonic receiver respectively; Ultrasonic frequency is 40kHz, and wavelength is 34000/40000=0.85cm; The spacing distance of ultrasonic generator and receiver at more than 5cm, and is parallel to circuit board placement.Although this invention range measurement system improves sensitivity and the antijamming capability of piezoelectric type ultrasonic distance measurement system, and volume is little, be easy to integrated.But not yet consider the impact of temperature and measuring accuracy needs to be improved further.
Summary of the invention
Technical matters to be solved by this invention provides a kind of ultrasonic ranging system adopting step-by-step counting for the deficiency of background technology, it has low cost, high precision, and can effectively avoid reducing the impact of temperature variation on distance accuracy, improve the measuring accuracy of infrared ranging system effectively.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of ultrasonic ranging system adopting step-by-step counting, comprise micro controller module and connected ultrasound wave transmitter module, ultrasound wave receiver module, display module and power module, described micro controller module comprises counting unit, data processing unit, described ultrasound wave transmitter module comprises the oscillator, the constant current that connect successively and launches a road, the first instruction issue circuit and ultrasound wave transmitting probe, and described ultrasound wave receiver module comprises the ultrasound wave Receiver, amplifying circuit, shaping circuit, the second instruction issue circuit that connect successively;
Wherein, ultrasound wave transmitter module, sends a count enable signal to counting unit by the first instruction issue circuit for launching ultrasound wave simultaneously;
Ultrasound wave receiver module, for sending a count stop signal to counting unit when receiving the ultrasound wave that barrier is reflected back for the first time by the second instruction issue circuit;
Counting unit, is receiving the pulse number between the count enable signal of ultrasound wave transmitter module transmission and the count stop signal of ultrasound wave receiver module transmission for calculating, and then pulse number is being uploaded to data processing unit;
Data processing unit, for basis, t=nm, s=vt/2 calculate the distance of distance barrier, are shown in real time by display unit simultaneously; Wherein, v is the velocity of sound under current environment, and t launches ultrasound wave and the mistiming receiving reflection wave, and n is umber of pulse, and m is the cycle of pulse.
As a kind of further preferred version adopting the ultrasonic ranging system of step-by-step counting of the present invention, described micro controller module is AVR series monolithic.
As a kind of further preferred version adopting the ultrasonic ranging system of step-by-step counting of the present invention, described display module is LCD display.
As a kind of further preferred version adopting the ultrasonic ranging system of step-by-step counting of the present invention, described ultrasound wave transmitter module and ultrasound wave receiver module pass through wireless connections with micro controller module respectively.
As a kind of further preferred version adopting the ultrasonic ranging system of step-by-step counting of the present invention, described power module is chargeable storage.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, structure of the present invention simple, there is low cost, measuring accuracy is high;
2, the present invention adopts " counting " mode, by calculating the pulse number between the count enable signal receiving ultrasound wave sending module and the transmission of ultrasound wave receiver module and count stop signal, the large increase that made accuracy of measurement have.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of ultrasonic ranging system adopting step-by-step counting, comprise micro controller module and connected ultrasound wave transmitter module, ultrasound wave receiver module, display module and power module, described micro controller module comprises counting unit, data processing unit, described ultrasound wave transmitter module comprises the oscillator, the constant current that connect successively and launches a road, the first instruction issue circuit and ultrasound wave transmitting probe, and described ultrasound wave receiver module comprises the ultrasound wave Receiver, amplifying circuit, shaping circuit, the second instruction issue circuit that connect successively;
Wherein, ultrasound wave transmitter module, sends a count enable signal to counting unit by the first instruction issue circuit for launching ultrasound wave simultaneously;
Ultrasound wave receiver module, for sending a count stop signal to counting unit when receiving the ultrasound wave that barrier is reflected back for the first time by the second instruction issue circuit;
Counting unit, is receiving the pulse number between the count enable signal of ultrasound wave transmitter module transmission and the count stop signal of ultrasound wave receiver module transmission for calculating, and then pulse number is being uploaded to data processing unit;
Data processing unit, for basis, t=nm, s=vt/2 calculate the distance of distance barrier, are shown in real time by display unit simultaneously; Wherein, v is the velocity of sound under current environment, and t launches ultrasound wave and the mistiming receiving reflection wave, and n is umber of pulse, and m is the cycle of pulse.
Wherein, described micro controller module is AVR series monolithic, and described display module is LCD display, and described ultrasound wave transmitter module and ultrasound wave receiver module pass through wireless connections with micro controller module respectively, and described power module is chargeable storage.
Current range measurement system range finding ultimate principle used is all be based upon on the basis of Measuring Time difference, and the method for Measuring Time mainly contains " pulse mode " and " frequency modulation 2 continuous wave mode ".These two kinds of metering systems are all realize with mimic channel, due to the impact of device time delay, measuring accuracy are declined greatly.The present invention adopts " counting " mode, by single-chip microcomputer process, and accuracy of measurement is had large increase.
The present invention adopts " counting " mode, measured by single-chip microcomputer process, its ultimate principle is: ultrasound wave transmitter module is in all the time launches hyperacoustic state, ultrasound wave transmitter module is for launching ultrasound wave, send a count enable signal to counting unit, micro controller module controls counting unit and starts with certain frequency counting, when ultrasound wave receiver module first time receives the ultrasound wave that barrier is reflected back simultaneously, provide one and stop count pulse, counting unit stops counting.Micro controller module processes automatically, is multiplied by umber of pulse n just obtains launching ultrasound wave to the hyperacoustic mistiming t of reception by the period m of pulse; For calculating the distance of distance barrier according to t=nm, s=ct/2, shown in real time by display unit simultaneously; Wherein, c is the light velocity under current environment, and t is transmitted wave and the mistiming t=nm receiving reflection wave, and wherein, n is umber of pulse, and m is the cycle of pulse.
AVR single chip has prefetched instruction function, namely when an execution instruction, in advance next instruction is got into, and call instruction can be performed within a clock period; Multiple accumulator type, data processing speed is fast; AVR single chip has 32 general purpose working registers, and being equivalent to has 32 viaducts, can fast passing; Response time is fast.AVR single chip has multiple fixing interrupt vector entry address, can respond interruption fast; AVR single chip power consumption is low.For typical power consumption situation, be 100nA when WDT closes, be more suitable for battery powered application apparatus; Minimum 1.8 V of some devices get final product work; AVR single chip security performance is good.
A kind of ultrasonic ranging system adopting step-by-step counting, comprise micro controller module and connected ultrasound wave transmitter module, ultrasound wave receiver module, display module and power module, described micro controller module comprises counting unit, data processing unit, described ultrasound wave transmitter module comprises the oscillator, the constant current that connect successively and launches a road, the first instruction issue circuit and ultrasound wave transmitting probe, and described ultrasound wave receiver module comprises the ultrasound wave Receiver, amplifying circuit, shaping circuit, the second instruction issue circuit that connect successively.The present invention adopts " counting " mode, is receiving by calculating the pulse number between count enable signal and count stop signal that ultrasound wave sending module and ultrasound wave receiver module send, accuracy of measurement is had large increase.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.

Claims (5)

1. one kind adopts the ultrasonic ranging system of step-by-step counting, it is characterized in that: comprise micro controller module and connected ultrasound wave transmitter module, ultrasound wave receiver module, display module and power module, described micro controller module comprises counting unit, data processing unit, described ultrasound wave transmitter module comprises the oscillator, the constant current that connect successively and launches a road, the first instruction issue circuit and ultrasound wave transmitting probe, and described ultrasound wave receiver module comprises the ultrasound wave Receiver, amplifying circuit, shaping circuit, the second instruction issue circuit that connect successively;
Wherein, ultrasound wave transmitter module, sends a count enable signal to counting unit by the first instruction issue circuit for launching ultrasound wave simultaneously;
Ultrasound wave receiver module, for sending a count stop signal to counting unit when receiving the ultrasound wave that barrier is reflected back for the first time by the second instruction issue circuit;
Counting unit, for calculating the pulse number between the count enable signal receiving infrared remote receiver transmission and count stop signal, and then is uploaded to data processing unit by pulse number;
Data processing unit, for basis, t=nm, s=vt/2 calculate the distance of distance barrier, are shown in real time by display unit simultaneously;
Wherein, v is the velocity of sound under current environment, and t launches ultrasound wave and the mistiming receiving reflection wave, and n is umber of pulse, and m is the cycle of pulse.
2. a kind of ultrasonic ranging system adopting step-by-step counting according to claim 1, is characterized in that: described micro controller module is AVR series monolithic.
3. a kind of ultrasonic ranging system adopting step-by-step counting according to claim 1, is characterized in that: described display module is LCD display.
4. a kind of ultrasonic ranging system adopting step-by-step counting according to claim 1, is characterized in that: described ultrasound wave transmitter module and ultrasound wave receiver module pass through wireless connections with micro controller module respectively.
5. a kind of ultrasonic ranging system adopting step-by-step counting according to claim 1, is characterized in that: described power module is chargeable storage.
CN201510076337.5A 2015-02-12 2015-02-12 Ultrasonic ranging system employing pulse counting Pending CN104678400A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105158766A (en) * 2015-08-31 2015-12-16 苏州市新瑞奇节电科技有限公司 Vehicle overweight monitoring system based on ultrasonic sensor
CN105158764A (en) * 2015-08-31 2015-12-16 苏州市新瑞奇节电科技有限公司 Ultrasonic vehicle overweight monitoring system with temperature compensation
CN105158765A (en) * 2015-08-31 2015-12-16 苏州市新瑞奇节电科技有限公司 Vehicle overweight detection method based on ultrasonic sensor
CN107830882A (en) * 2017-10-23 2018-03-23 中国联合网络通信集团有限公司 Alarm method and device based on ultrasonic wave

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1103490A (en) * 1993-11-29 1995-06-07 山东矿业学院济南分院 Three-point space supersonic angle and distance measuring method and equipment
JPH1144759A (en) * 1997-07-29 1999-02-16 Idec Izumi Corp Ultrasonic distance measuring device and distance measuring method using ultrasonic wave
CN201083835Y (en) * 2007-10-17 2008-07-09 张鹍 Ultrasonic distance-measuring alarming device
CN103573261A (en) * 2012-08-03 2014-02-12 中国石油天然气集团公司 Underground ultrasonic roof and floor measuring method and device
CN103941258A (en) * 2014-04-04 2014-07-23 陕西理工学院 Ultrasonic rangefinder based on single-chip microcomputer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1103490A (en) * 1993-11-29 1995-06-07 山东矿业学院济南分院 Three-point space supersonic angle and distance measuring method and equipment
JPH1144759A (en) * 1997-07-29 1999-02-16 Idec Izumi Corp Ultrasonic distance measuring device and distance measuring method using ultrasonic wave
CN201083835Y (en) * 2007-10-17 2008-07-09 张鹍 Ultrasonic distance-measuring alarming device
CN103573261A (en) * 2012-08-03 2014-02-12 中国石油天然气集团公司 Underground ultrasonic roof and floor measuring method and device
CN103941258A (en) * 2014-04-04 2014-07-23 陕西理工学院 Ultrasonic rangefinder based on single-chip microcomputer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105158766A (en) * 2015-08-31 2015-12-16 苏州市新瑞奇节电科技有限公司 Vehicle overweight monitoring system based on ultrasonic sensor
CN105158764A (en) * 2015-08-31 2015-12-16 苏州市新瑞奇节电科技有限公司 Ultrasonic vehicle overweight monitoring system with temperature compensation
CN105158765A (en) * 2015-08-31 2015-12-16 苏州市新瑞奇节电科技有限公司 Vehicle overweight detection method based on ultrasonic sensor
CN107830882A (en) * 2017-10-23 2018-03-23 中国联合网络通信集团有限公司 Alarm method and device based on ultrasonic wave

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