CN106197333A - A kind of 40KC ultrasonic displacement sensor compressing multipath effect based on time window and matched filtering - Google Patents
A kind of 40KC ultrasonic displacement sensor compressing multipath effect based on time window and matched filtering Download PDFInfo
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- CN106197333A CN106197333A CN201610553859.4A CN201610553859A CN106197333A CN 106197333 A CN106197333 A CN 106197333A CN 201610553859 A CN201610553859 A CN 201610553859A CN 106197333 A CN106197333 A CN 106197333A
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- ultrasound wave
- ultrasonic
- chip microcomputer
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- displacement sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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- General Physics & Mathematics (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of 40KC ultrasonic displacement sensor compressing multipath effect based on time window and matched filtering, including ultrasonic transmission driver, 40KC ultrasound wave delivery header, 40KC ultrasound wave receives head, window reception amplifier, synchronous detection module, output interface and single-chip microcomputer, this ultrasonic displacement sensor achieves the filtering of time fenestra and the synchronous filtering of optimal coupling, completely eliminate the multi-path jamming that 40KC ultrasound wave brings because of strong reflection and large scattering angle, thus solve the application on ultrasound wave electric eye of this type probe, realize circuit reduction, reach to be substantially reduced the cost of ultrasonic electric eye, stability and ease for use are but substantially improved.
Description
Technical field
The invention belongs to the technical field of ultrasonic sensor, specifically, relate to one based on time window and coupling filter
The 40KC ultrasonic displacement sensor of wave pressure contracting multipath effect.
Background technology
Ultrasonic displacement sensor, is commonly called as ultrasonic electric eye, can pervasive different color material, so excellent more than photo-electric electric eye
More, the most ultrasonic electric eye has replaced the trend of traditional photo sensor.Existing ultrasonic electric eye, all uses about 200KC ultrasonic
Ripple, but common compared to market 40KC probe, the former price is high, the transmitting of ultrasound wave, receive, process the most difficult and
Complicated.40KC ultrasound wave has powerful penetration power, reflectivity and big sector scan angle, thus brings multi-path jamming, for
Material displacement detection in the range of 50 millimeters, precision is interfered, so that its cheap 40KC probe is fresh on ultrasonic electric eye
There is application.
Summary of the invention
For deficiency above-mentioned in prior art, the present invention provides a kind of and compresses multipath effect based on time window and matched filtering
The 40KC ultrasonic displacement sensor answered, this ultrasonic displacement sensor realizes circuit reduction, stability and ease for use and significantly carries
Rise, while significantly reducing the cost, reached higher reliability.
In order to achieve the above object, the solution that the present invention uses is: one is compressed based on time window and matched filtering
The 40KC ultrasonic displacement sensor of multipath effect, including ultrasonic transmission driver, 40KC ultrasound wave delivery header, 40KC ultrasound wave
Receive head, window reception amplifier, synchronous detection module, output interface and single-chip microcomputer,
Ultrasonic transmission driver, for amplifying the 40KC ultrasonic pulse group energy of single-chip microcomputer output, to meet receiving terminal pair
The requirement of amplitude of ultrasonic；
40KC ultrasound wave delivery header and 40KC ultrasound wave receive head, have been used for the supersonic electroacoustic of 40KC (2A) and acoustic-electric
(2B) conversion；
Window reception amplifier, under single-chip microcomputer timing controlled, opens in limited time or barrage reception end is to ultrasound wave
Amplify；
Synchronous detection module, for the ultrasound wave after amplifying in limited time is carried out amplitude detection, its output send single-chip microcomputer to carry out
A/D changes, and accepts the cleaning command that single-chip microcomputer sends subsequently, removes the rectified signal being sampled before this, thus realizes synchronization
Join filtering；
Output interface, moves into the switching pulse of direct ratio, analog voltage and digital traffic for output and material level, and it divides
Not by single-chip microcomputer on-off control, pulsewidth modulation and single-chip microcomputer hardware serial ports are nursed one's health.
Preferably, window reception amplifier includes high-frequency microwave pipe.
The invention has the beneficial effects as follows, it is same with most preferably mate that this ultrasonic displacement sensor achieves the filtering of time fenestra
Step filtering, completely eliminates the multi-path jamming that 40KC ultrasound wave brings because of strong reflection and large scattering angle, thus solves this type probe
Application on ultrasound wave electric eye, it is achieved circuit reduction, reaches to be substantially reduced the cost of ultrasonic electric eye, and stability and ease for use are but
It is substantially improved.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the present invention.
Fig. 2 is the circuit diagram of the window reception amplifier of the present invention.
Fig. 3 is the time cooperation schematic diagram of the present invention.
In accompanying drawing:
1, ultrasonic transmission driver；2A, 40KC ultrasound wave delivery header；2B, 40KC ultrasound wave receives head；3, window reception is put
Big device；4, synchronous detection module；5, output interface；6, single-chip microcomputer.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
With reference to Fig. 1, the present invention provides a kind of 40KC ultrasound wave position compressing multipath effect based on time window and matched filtering
Displacement sensor, including ultrasonic transmission driver 1,40KC ultrasound wave delivery header 2A, 40KC ultrasound wave receives head 2B, window reception is put
Big device 3, synchronous detection module 4, output interface 5 and single-chip microcomputer 6, ultrasonic transmission driver 1, for amplifying single-chip microcomputer 6 output
40KC ultrasonic pulse group energy, to meet the receiving terminal requirement to amplitude of ultrasonic；40KC ultrasound wave delivery header 2A and 40KC surpasses
Acoustic receiver head 2B, has been used for the supersonic electroacoustic of 40KC (2A) and acoustic-electric (2B) conversion；Window reception amplifier 3, window
Reception amplifier 3 includes high-frequency microwave pipe, under single-chip microcomputer 6 timing controlled, opens in limited time or barrage reception end is to ultrasonic
The amplification of ripple；Synchronous detection module 4, for the ultrasound wave after amplifying in limited time is carried out amplitude detection, its output send single-chip microcomputer 6 to enter
Row A/D changes, and accepts the cleaning command that single-chip microcomputer 6 sends subsequently, removes the rectified signal being sampled before this, thus realizes synchronizing
Matched filtering；Output interface 5, moves into the switching pulse of direct ratio for output and material level, analog voltage and digital traffic, it
Respectively by single-chip microcomputer 6 on-off control, pulsewidth modulation and single-chip microcomputer 6 hardware serial ports are nursed one's health.
This ultrasonic displacement sensor achieves the filtering of time fenestra and the synchronous filtering of optimal coupling, completely eliminates
The multi-path jamming that 40KC ultrasound wave brings because of strong reflection and large scattering angle, thus solve this type probe answering on ultrasound wave electric eye
With, reaching to be substantially reduced the cost of ultrasonic electric eye, stability and ease for use are but substantially improved, it is achieved circuit reduction.
With reference to Fig. 2, this figure is window reception amplifier 3, is also a single tube resistance capacity coupled amplifier.Q3 is cheap height
Frequently microwave tube SS9018, selects it to be because having high-frequency low-noise only and could mate the faint amplification of 40KC acoustic-electric.47 Europe small resistors
R23 is series on the ultrasonic path of 40KC, the spike interference that ultrasonic probe of releiving the is picked up impact to Q3；Equivalent series resistance
R22R21 is that Q3 provides appropriate input biasing, and equivalence is to try to achieve balance between decay and impedance.The base stage of Q3 is inclined
Putting current draw in oneself upper end colelctor electrode, this is to protect the stable quiescent point of positive Q3 with direct current negative feedback, the most also wants
Guaranteeing that Q3 is in critical magnifying state all the time, then this about 0.7V reverse bias of Q3 colelctor electrode, just serves as detection two pole
Pipe D2 on-level, allows detector diode D2 be also at critical conduction state, and the efficiency of such detection is the highest.It is defeated that C8 has blocked Q3
Going out end reversely to feedback 40KC ultrasonic signal, Q3 could promote the sensitivity of ultrasonic electric eye with more high-gain；C9 smooths out
The pulsation of 40KC, extracts it and moves into direct ratio average voltage with material level.Resistance R24 lower end is connected to the P1.2 mouth line of single-chip microcomputer 6
On, it is defaulted as strong pull-up at ordinary times, is just forcibly pushed into the degree of depth saturated mode when so Q3 is flat and loses amplification function.
When probe of making a start sends 40KC ultrasonic pulse group, and after postponing 0.13mS, order P1.2 closes strong pull-up, and Q3 is critical
Amplification is unlocked, and continues one or 0.13mS amplification, detection, the widow time of sampling, and in this time slice, direct projection is super
The main ripple of sound has passed through " time window " and " critical window " the most simultaneously, and delayed multipath clutter almost all is blocked.
Here 45 millimeters is the opening size of electric eye, and 340 metre per second (m/s)s are the spread speeds of sound.
Fall ultrasonic main ripple in window by halfwave rectifier, connect by resistance R25 after C9 is smooth and guide to what single-chip microcomputer 6 carried
In A/D conversion, the 0.13mS sampling time enough extracts sampling point more than 10 times, and the software filtering algorithm of intermediate means of quoteing in broken sentences is
Necessary.The most again amplification window being shut in P1.2 strong pull-up, open getting off by force of P1.4 simultaneously, one pushes away one draws one to open one to close
Two match, and on C9, detecting circuit before this is quickly thoroughly washed, and the most each sampling is all without the cumulative last time
Interference accumulation, it is ensured that software correct decisions, order output interface 5 pushes believable material shift value, and whole system is entered finally
Enter state of stopping, wait the circulation again of next round at leisure.Its strict sequential order coordinates with reference to Fig. 3.
By drawing above, as long as adjusting the window size of sampling, can be achieved with the sensitivity adjusting to ultrasonic electric eye.
Claims (2)
1. compress a 40KC ultrasonic displacement sensor for multipath effect based on time window and matched filtering, it is characterized in that: bag
Include ultrasonic transmission driver (11), 40KC ultrasound wave delivery header (2A), 40KC ultrasound wave reception head (2B), window reception amplifier
(3), synchronous detection module (4), output interface (5) and single-chip microcomputer (6),
Ultrasonic transmission driver (11), is used for amplifying the 40KC ultrasonic pulse group energy that single-chip microcomputer (6) exports, to meet receiving terminal
Requirement to amplitude of ultrasonic；
40KC ultrasound wave delivery header (2A) and 40KC ultrasound wave receive head (2B), be used for the supersonic electroacoustic of 40KC (2A) and
Acoustic-electric (2B) is changed；
Window reception amplifier (3), under single-chip microcomputer (6) timing controlled, opens in limited time or barrage reception end is to ultrasound wave
Amplification；
Synchronous detection module (4), for the ultrasound wave after amplifying in limited time is carried out amplitude detection, its output send single-chip microcomputer (6) to enter
Row A/D changes, and accepts the cleaning command that single-chip microcomputer (6) sends subsequently, removes the rectified signal being sampled before this, thus realizes same
Step matched filtering；
Output interface (5), moves into the switching pulse of direct ratio, analog voltage and digital traffic for output and material level, and it divides
Not by single-chip microcomputer (6) on-off control, pulsewidth modulation and single-chip microcomputer (6) hardware serial ports are nursed one's health.
The 40KC ultrasonic displacement sensing compressing multipath effect based on time window and matched filtering the most according to claim 1
Device, is characterized in that: described window reception amplifier (3) includes high-frequency microwave pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610553859.4A CN106197333A (en) | 2016-07-14 | 2016-07-14 | A kind of 40KC ultrasonic displacement sensor compressing multipath effect based on time window and matched filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610553859.4A CN106197333A (en) | 2016-07-14 | 2016-07-14 | A kind of 40KC ultrasonic displacement sensor compressing multipath effect based on time window and matched filtering |
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| CN106197333A true CN106197333A (en) | 2016-12-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063778A (en) * | 2010-11-08 | 2011-05-18 | 华南理工大学 | Singlechip based eyesight protection warning system |
| CN102291114A (en) * | 2011-06-20 | 2011-12-21 | 南京华敏电子有限公司 | Ultrasonic switch based on pattern recognition and control method thereof |
| CN102999986A (en) * | 2013-01-07 | 2013-03-27 | 山东师范大学 | Embedded invasion detection system and detection method based on ultraphonic phase array |
| CN103364786A (en) * | 2013-07-29 | 2013-10-23 | 河南中医学院 | Portable type intelligent distance measurement instrument with voice function |
| CN104812302A (en) * | 2012-11-28 | 2015-07-29 | 赛卡股份公司 | Length measuring device |
-
2016
- 2016-07-14 CN CN201610553859.4A patent/CN106197333A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063778A (en) * | 2010-11-08 | 2011-05-18 | 华南理工大学 | Singlechip based eyesight protection warning system |
| CN102291114A (en) * | 2011-06-20 | 2011-12-21 | 南京华敏电子有限公司 | Ultrasonic switch based on pattern recognition and control method thereof |
| CN104812302A (en) * | 2012-11-28 | 2015-07-29 | 赛卡股份公司 | Length measuring device |
| CN102999986A (en) * | 2013-01-07 | 2013-03-27 | 山东师范大学 | Embedded invasion detection system and detection method based on ultraphonic phase array |
| CN103364786A (en) * | 2013-07-29 | 2013-10-23 | 河南中医学院 | Portable type intelligent distance measurement instrument with voice function |
Non-Patent Citations (1)
| Title |
|---|
| 兰羽: "基于40kHZ超声波测距系统的设计", 《机械与电子》 * |
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Application publication date: 20161207 |
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