CN206209104U - A kind of non-blind area ultrasonic ranging probe - Google Patents
A kind of non-blind area ultrasonic ranging probe Download PDFInfo
- Publication number
- CN206209104U CN206209104U CN201621317223.1U CN201621317223U CN206209104U CN 206209104 U CN206209104 U CN 206209104U CN 201621317223 U CN201621317223 U CN 201621317223U CN 206209104 U CN206209104 U CN 206209104U
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- Prior art keywords
- ultrasonic
- amplifier
- ultrasonic receiver
- receiver
- blind area
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Abstract
The utility model discloses a kind of non-blind area ultrasonic ranging probe, the probe includes ultrasonic transmitter T in the same plane, the first ultrasonic receiver R1 and the second ultrasonic receiver R2, the first ultrasonic receiver R1 and the second ultrasonic receiver R2 and ultrasonic transmitter T apart from identical and in the same side of ultrasonic transmitter T；Second ultrasonic receiver R2 is covered by a container for groove at side surface, can be with separating echo, and the direction of container fluting faces ultrasonic transmitter T.First ultrasonic receiver R1 and the second ultrasonic receiver R2 can be influenceed on constant amplitude ground by the straight-through ripple of ultrasonic transmitter T crosstalks simultaneously.The influence of the straight-through ripple of crosstalk is eliminated using the method that inversely adds, non-blind area ultrasonic ranging, simple structure is realized, it is easy to accomplish, effect is good.
Description
Technical field
The utility model belongs to ultrasonic ranging field, more particularly to a kind of non-blind area ultrasonic ranging probe.
Background technology
Ultrasonic wave follows propagation law of the common mechanical ripple in elastic fluid, is characterized in along straightline propagation, with good
Good bunchy, good directionality can occur reflection and refraction effect at the interface of medium, its vibration width after medium is entered
Degree can decay because of Absorption of Medium.The frequency of ultrasonic wave can be very high, reaches a megahertz level.
Spread speed substantially constant of the ultrasonic wave in same medium, therefore passed through in the medium using ultrasonic wave is measured
Time used by one segment distance, it is possible to achieve contactless range finding.In order to improve the accuracy of range finding, it is necessary to accurate measurement ultrasound
Elapsed time (pacing the more time) when ripple is propagated in media as well.
In reflecting type ultrasonic ranging scheme, ultrasonic transmitter and ultrasonic receiver be located in together, when
When ultrasonic transmitter works, mechanical oscillation can at first pass to receiver by circuit board, by airborne ultrasonic wave
Receiver can be reached, these ripples are referred to as the straight-through ripple (also referred to as leakage waves) of crosstalk, when the electric signal of excitation ultrasonic transmitter stops
Afterwards, due to the factor of machinery inertial, ultrasonic transmitter oscillator can still vibrate several cycles.During this period, ultrasonic wave is received
Device is constantly subjected to the influence of the straight-through ripple of crosstalk, it is impossible to correctly differentiate ultrasonic echo signal, and the influence of the only straight-through ripple of crosstalk disappears
After mistake, ultrasonic receiver could correctly differentiate ultrasonic echo signal；The time of the straight-through wave action of crosstalk is exactly ultrasound
Away from blind area, generally represented with distance that this period, ultrasonic wave was propagated in media as well, existing transceiver ultrasonic waves
Energy device there are about the range hole of 30cm.
The method for reducing range hole mainly has two kinds.One is started with from the structure of transducer, by appropriate structure
Design, while considering to improve transducer sensitivity, takes appropriate measure to suppress remained shock and attached frequency vibration, so that transducer
With sensitivity higher and there is less transmitted wave to trail, but this method is similarly faced with raising sensitivity and reduces and sends out
The contradiction of ejected wave hangover, acts on limited.Another method is started with from signal amplification circuit, using time-varying gain amplifier, i.e.,
The characteristics of amplitude according to echo-signal exponentially decays with the propagation time, gain is designed to the time by reception amplifier
Exponentially increased time-varying gain amplifier, within the specific limits, makes far and near different echo-signal balancedly to put
Arrive appropriate amplitude greatly, it is to avoid crossing for transmitted wave hangover signal is amplified, therefore, measurement blind area is reduced to a certain extent.
However, analysis understands, this method reaches by control gain and suppresses measurement blind area.The transmitted wave of blind area size is influenceed to drag
The repressed precondition of tail signal energy is the amplitude that echo signal amplitude have to be larger than relevant position hangover signal, can be obtained
Blind area least limit be echo-signal amplitude and relevant position transmitting hangover signal amplitude it is equal when it is corresponding measurement away from
From, it is clear that actual blind area is also bigger than this.Want further to reduce measurement blind area, incapability is the method that time-varying gain suppresses
Power.
The content of the invention
The purpose of this utility model is directed to the deficiencies in the prior art, there is provided a kind of non-blind area based on the principle that inversely adds
Ultrasonic ranging is popped one's head in.
The purpose of this utility model is achieved through the following technical solutions：A kind of non-blind area ultrasonic ranging probe,
The probe includes ultrasonic transmitter T in the same plane, the first ultrasonic receiver R1 and the second ultrasonic receiver
R2, the first ultrasonic receiver R1 and the second ultrasonic receiver R2 and ultrasonic transmitter T are apart from identical and in ultrasonic wave
The same side of transmitter T；Second ultrasonic receiver R2 is covered by a container for groove at side surface, can be with separating echo, the appearance
The direction of device fluting faces ultrasonic transmitter T.
Further, the probe also includes chopped-off head amplifier, secondary amplifier, final amplifier, rectification circuit, filtered electrical
Road, voltage comparator, controller and power driving circuit；The first ultrasonic receiver R1 and the second ultrasonic receiver R2
After the signal of reception amplifies respectively through chopped-off head amplifier, the common secondary amplifier of input, the output signal of secondary amplifier according to
It is secondary through final amplifier, rectification circuit, filter circuit after, be input to voltage comparator, the output connection control of voltage comparator
Device；Power driving circuit one end connects ultrasonic transmitter T, other end connection controller；The chopped-off head amplifier is using anti-phase
Amplifier, the secondary amplifier uses the subtracter of gain controllable, the final amplifier to use resonant selecting frequency amplifier.
The beneficial effects of the utility model are：A kind of non-blind area ultrasonic ranging probe that the utility model is provided, uses
Ultrasonic transmitter T, the first ultrasonic receiver R1 and the second ultrasonic receiver R2 in the same plane, the first ultrasound
Ripple receiver R1 and the second ultrasonic receiver R2 and ultrasonic transmitter T are apart from identical and in the same of ultrasonic transmitter T
Side, can be influenceed on constant amplitude ground by the straight-through ripple of ultrasonic transmitter T crosstalks simultaneously, for ultrasound echo signal, due to
R2Covered by the container of a groove at side surface, therefore do not receive echo-signal, and R1But echo letter can unhinderedly be received
Number.As long as therefore by R1、R2The electric signal of output is inversely added can just be completely eliminated the influence of the straight-through ripple of crosstalk, and right
For echo-signal, due to R2Echo is not received, the result for inversely adding is exactly only to export R1The electric signal for receiving, string
The influence for disturbing straight-through ripple is eliminated.Therefore, present invention probe is completely eliminated the influence of the straight-through ripple of crosstalk, realizes non-blind area ultrasound
Ripple is found range, simple structure, it is easy to accomplish, effect is good.
Brief description of the drawings
(a) is ultrasonic transmitter T and ultrasonic receiver R in Fig. 11、R2Topology layout figure, (b) is R2By a side
The structural representation of the container covering of face fluting；
Fig. 2 is to pop one's head in realize the system construction drawing of ultrasonic ranging by the utility model；
Fig. 3 is the oscillogram of each functional module output；
Fig. 4 is the circuit theory diagrams of the utility model non-blind area ultrasonic ranging probe；
In figure, chopped-off head amplifier 1, secondary amplifier 2, final amplifier 3, rectification circuit 4, filter circuit 5, voltage ratio compared with
Device 6, controller 7, power driving circuit 8, barrier 9.
Specific embodiment
The utility model is described in detail below according to accompanying drawing, the purpose of this utility model and effect will be apparent.
A kind of non-blind area ultrasonic ranging probe based on the principle that inversely adds that the utility model is provided, the probe includes
One ultrasonic transmitter T and two ultrasonic receiver R1、R2, two ultrasonic receiver R1、R2With ultrasonic transmitter T
Apart from the same side identical and in ultrasonic transmitter, ultrasonic transmitter T and ultrasonic receiver R1、R2In same flat
On face, in such as Fig. 1 shown in (a)；Second ultrasonic receiver R2With the first ultrasonic receiver R1Difference be, R2By
One container covering of groove at side surface, the direction of container fluting faces ultrasonic transmitter T, in such as Fig. 1 shown in (b).
Topology layout in Fig. 1 shown in (b), ultrasonic receiver R1、R2, can be sent out by ultrasonic wave to constant amplitude simultaneously
The influence of the straight-through ripple of emitter T crosstalks, but for ultrasound echo signal, due to R2Covered by the container of a groove at side surface
Lid, therefore echo-signal is not received, and R1But echo-signal can unhinderedly be received.As long as therefore by R1、R2The electricity of output
Signal is inversely added can just be completely eliminated the influence of the straight-through ripple of crosstalk, and for echo-signal, due to R2Receive
Less than echo, the result for inversely adding is exactly only to export R1The electric signal for receiving, the influence of the straight-through ripple of crosstalk is eliminated.
Fig. 2 describes to be based on the system construction drawing that above-mentioned probe realizes ultrasonic ranging, including ultrasonic transmitter T, the
One ultrasonic receiver R1, the second ultrasonic receiver R2, the power driving circuit 8 for driving ultrasonic transmitter T is used for
Amplify the chopped-off head amplifier 1 of ultrasonic receiver signal, secondary amplifier 2, final amplifier 3, rectification circuit 4, filter circuit
5, voltage comparator 6, controller 7.
The output ultrasonic wave carrier signal of controller 7, its frequency is corresponding with the working frequency of ultrasonic transmitter T, generally
It is 40kHz, this signal is followed by ultrasonic transmitter T through the amplification of power driving circuit 8, because ultrasonic transmitter T is machinery
Oscillator, exponentially rule increases to fixed ampllitude to its Oscillation Amplitude from 0, and also exponentially rule increases the acoustic pressure amplitude of the ultrasonic wave of transmitting
Plus, such as shown in Fig. 3 (a).When controller 7 stops output ultrasonic wave carrier signal, due to the reason of machinery inertial, transmitting probe
Oscillation Amplitude exponentially rule decays to 0, also exponentially rule decays to 0 to the acoustic pressure amplitude of ultrasonic wave, such as shown in Fig. 3 (a).
When ultrasonic transmitter T starts vibration, except to spatial emission ultrasonic wave, its mechanical oscillation can also be along solid surface of shell
Propagated in sector, due to ultrasonic receiver R1、R2It is equal with the distance of ultrasonic transmitter T and it is same propagation sector on,
Therefore this vibration can be experienced to constant amplitude simultaneously, because the speed propagated in solid housing is faster than the speed propagated in atmosphere
Degree, ultrasonic receiver R1、R2The vibration of solid housing propagation can be first received, airborne vibration, final R is then received1、
R2Output is two kinds of overlaid waveforms with frequency ripple, shown in such as Fig. 3 (b), 3 (c).
Reflection can be produced when the ultrasonic wave propagated in air runs into barrier, due to R2By a container for groove at side surface
Covered, therefore R2Echo, only R are not received1Echo can be received, shown in such as Fig. 3 (b).
Ultrasonic receiver R1、R2The electric signal of output is extremely faint, must be by can be just used after amplification, therefore Fig. 2
In two chopped-off head amplifiers 1 first R1、R2After the electric signal of output amplifies certain multiple, just carried out subtracting fortune by secondary amplifier 2
Calculate, the signal that secondary amplifier 2 exports subtracter is made further to amplify, to improve the sensitivity for receiving, rectification and filter as far as possible
AC signal is transformed into DC pulse signal voltage supplied comparator 6 and used by wave circuit, when the amplitude of echo-signal is more than reference
Voltage VTWhen, the output of voltage comparator 6 will be changed into high level from low level, shown in such as Fig. 3 (f).It is super from the output of controller 7
Sound wave carrier signal starts, and the logic to the output pin of voltage comparator 6 is changed into high level from low level, between experienced time Δ
t2, this period is exactly that ultrasonic wave travels to barrier 9 and again return to ultrasonic transmitter T to be experienced from ultrasonic transmitter T
Time, therefore the distance between ultrasonic transmitter T and barrier 9Wherein：C is the aerial biography of ultrasonic wave
Broadcast speed,Unit is m/s, and T is environment temperature.
Ultrasonic receiver R1、R2Identical is kept to shake as far as possible with the straight propagation paths between ultrasonic transmitter T
Dynamic condition and steric requirements, the explanation for becoming apparent from is, mounting ultrasonic receiver R1、R2With the circuit board of ultrasonic transmitter T
To be avoided in R as far as possible in design1Between T, R2Mask placement device, fluting between T, in order to avoid influence mechanical wave along circuit board by T
To R1、R2Vibration characteristics, influence R1、R2Receive the uniformity of the straight-through ripple of crosstalk propagated by circuit board；Spatially, R1With T
Between, R2Also try not to place obstacle between T, in order to avoid influence R1、R2Receive and the consistent of ripple is led directly to by the crosstalk of spatial
Property, ensure that the influence of the straight-through ripple of crosstalk is completely eliminated after inversely adding as far as possible.
In circuit design, ultrasonic receiver R1、R2Signal transacting using three-level amplify circuit structure, such as Fig. 4 institutes
Show.In the element selection of amplifier, low-noise amplifier LF356 turns into first-selection, in order to resistance is first in reducing chopped-off head amplifier
The influence of noise of part, chopped-off head amplifier 1 uses anti-phase amplification, and such resistance R1_2, R1_5 can select less resistance, so that
Advantageously reduce the noise of amplifier.In the selection of R1_2, R1_5 resistance, R1_2, R1_5 preferably try one's best and are received close to ultrasonic wave
Device R1、R2Output resistance, accomplish power match as much as possible, improve sound-electric conversion efficiency.The resistance of balance resistance R1_1, R1_4
It is the parallel resistance value of R1_2, R1_3 and R1_5, R1_6 to be worth, to reduce input offset current as much as possible to amplifier gain
Influence；The voltage gain of chopped-off head amplifier byDetermine.
Secondary amplifier 2 is realized by IC3, is the subtraction circuit of a gain controllable, and the signal of amplifier output is same phase
The signal of input is held to subtract after the signal of end of oppisite phase multiplied by with resistance ratioFinal amplifier 3 is resonant selecting frequency
Amplifier, the purpose is to the bandwidth of operation of step-down amplifier, improves signal to noise ratio；Resistance R1_11 be used for adjust resonant tank T1_1,
The Q values of C1_4, adjust this grade of bandwidth of operation and voltage gain of amplifier.C1_5, D1, D2 then constitute voltage doubling rectifing circuit, R1_
13rd, C1_6, R1_14, C1_7 then constitute two-stage low-pass filter circuit, and what is exported after filtering is the amplitude of echo-signal, this signal
The in-phase input end of voltage comparator ic 6 is connected to, the inverting input of voltage comparator ic 6 is connected to R1_15, C1_8, R1_16
The voltage reference of composition, the reference voltage isWhen the amplitude of echo-signal exceedes this voltage reference
When, the output of voltage comparator ic 6 will become logic 1 from logical zero.
Controller 7 select AVR single chip ATMEGA8-16AU, its PD mouthful two pins PD6, PD7 output a string it is differential
Square wave, under the 4 road parallel drives of logical drive chip 74HC573, promote ultrasonic transmitter T send ultrasonic wave.Due to
Using differential type of drive, therefore it is added in the twice that the drive voltage amplitude on ultrasonic transmitter T is supply voltage.
The utility model is popped one's head in there is provided a kind of non-blind area ultrasonic ranging, complete by the mounting structure with special characteristic
Totally disappeared except the influence of the straight-through ripple of crosstalk, realize non-blind area ultrasonic ranging, simple structure, it is easy to accomplish, effect is good.
A kind of non-blind area ultrasonic ranging probe of the utility model description, described details is only preferably embodiment party
Formula, but this is not intended to be limited to, embodiments thereof is simultaneously not restricted to the described embodiments, other any new based on this practicality
Change, modification, combination, the simplification made under type principle, are accordingly to be regarded as equivalent substitute mode, are all contained in guarantor of the present utility model
Within the scope of shield.
Claims (2)
1. a kind of non-blind area ultrasonic ranging is popped one's head in, it is characterised in that the probe includes that ultrasonic wave in the same plane is sent out
Emitter T, the first ultrasonic receiver R1 and the second ultrasonic receiver R2, the first ultrasonic receiver R1 and the second ultrasonic wave connect
Device R2 and ultrasonic transmitter T are received apart from identical and in the same side of ultrasonic transmitter T；Second ultrasonic receiver R2 by
One container covering of groove at side surface, the direction of container fluting faces ultrasonic transmitter T.
2. a kind of non-blind area ultrasonic ranging according to claim 1 is popped one's head in, it is characterised in that also amplified including chopped-off head
Device, secondary amplifier, final amplifier, rectification circuit, filter circuit, voltage comparator, controller and power driving circuit；Institute
State after the signal that the first ultrasonic receiver R1 and the second ultrasonic receiver R2 receive amplifies respectively through chopped-off head amplifier, altogether
With the secondary amplifier of input, the output signal of secondary amplifier successively through final amplifier, rectification circuit, filter circuit after, it is defeated
Enter to voltage comparator, the output connection controller of voltage comparator；Power driving circuit one end connects ultrasonic transmitter T,
The other end connects controller；The chopped-off head amplifier uses inverting amplifier, secondary amplifier the subtracting using gain controllable
Musical instruments used in a Buddhist or Taoist mass, the final amplifier uses resonant selecting frequency amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621317223.1U CN206209104U (en) | 2016-12-03 | 2016-12-03 | A kind of non-blind area ultrasonic ranging probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621317223.1U CN206209104U (en) | 2016-12-03 | 2016-12-03 | A kind of non-blind area ultrasonic ranging probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206209104U true CN206209104U (en) | 2017-05-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621317223.1U Withdrawn - After Issue CN206209104U (en) | 2016-12-03 | 2016-12-03 | A kind of non-blind area ultrasonic ranging probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206209104U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483526A (en) * | 2016-12-03 | 2017-03-08 | 杭州立方控股股份有限公司 | A kind of non-blind area ultrasonic ranging probe and distance-finding method |
| US11614744B2 (en) | 2017-11-14 | 2023-03-28 | Positec Power Tools (Suzhou) Co., Ltd. | Self-moving apparatus and method for controlling same |
| CN116458925A (en) * | 2023-06-15 | 2023-07-21 | 山东百多安医疗器械股份有限公司 | Portable non-blind area multi-mode ultrasonic electrocardio system |
-
2016
- 2016-12-03 CN CN201621317223.1U patent/CN206209104U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106483526A (en) * | 2016-12-03 | 2017-03-08 | 杭州立方控股股份有限公司 | A kind of non-blind area ultrasonic ranging probe and distance-finding method |
| CN106483526B (en) * | 2016-12-03 | 2023-09-19 | 杭州立方控股股份有限公司 | Non-blind area ultrasonic ranging probe and ranging method |
| US11614744B2 (en) | 2017-11-14 | 2023-03-28 | Positec Power Tools (Suzhou) Co., Ltd. | Self-moving apparatus and method for controlling same |
| CN116458925A (en) * | 2023-06-15 | 2023-07-21 | 山东百多安医疗器械股份有限公司 | Portable non-blind area multi-mode ultrasonic electrocardio system |
| CN116458925B (en) * | 2023-06-15 | 2023-09-01 | 山东百多安医疗器械股份有限公司 | Portable non-blind area multi-mode ultrasonic electrocardio system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170531 Effective date of abandoning: 20230919 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170531 Effective date of abandoning: 20230919 |