CN201698020U - Device using ultrasonic wave for measuring positions of objects - Google Patents
Device using ultrasonic wave for measuring positions of objects Download PDFInfo
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- CN201698020U CN201698020U CN201020242466XU CN201020242466U CN201698020U CN 201698020 U CN201698020 U CN 201698020U CN 201020242466X U CN201020242466X U CN 201020242466XU CN 201020242466 U CN201020242466 U CN 201020242466U CN 201698020 U CN201698020 U CN 201698020U
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- chip microcomputer
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Abstract
The utility model provides a device using ultrasonic wave for measuring positions of objects, which can position two or more objects. The device comprises a single-chip microcomputer used for processing signals, at least two ultrasonic transmitting-receiving sensors, wherein each sensor is connected with the single-chip microcomputer by a transceiving circuit. The single-chip microcomputer controls the transmitting-receiving sensors to transmit and receive ultrasonic waves, computes the positions of a plurality of objects by a certain algorithm, and even measuring the outlines of objects. The device is applicable to the filed of robots, multi-point touch screens, and the like.
Description
One, technical field:
The utility model relates to a kind of device of ultrasonic measurement object space, is applicable to robot, multipoint touch screens and other fields.
Two, background technology:
The distance that ultrasound wave is strong owing to directive property, energy consumption slow and propagate in medium is far away, thereby through being usually used in the measurement of distance.Hyperacoustic circulation way is rectilinear propagation, but reflection and diffraction can take place when running into barrier; Frequency is high more, reflects by force more, and diffraction is weak more.Utilize ultrasonic locating often relatively rapidly, convenient, and calculate simple, be easy to accomplish real-time control.
The conventional ultrasonic wave locating device is used the little ultrasonic transmitter of emission angle always, the imitation bat utilizes ears time of reception difference to position, this type of device can only position an object in the investigative range mostly, and when other objects were arranged in the investigative range, its positioning result was interfered easily and is inaccurate.
Three, summary of the invention:
The device that a kind of ultrasonic measurement object space is provided of the present utility model, this device can position two or more objects.
The purpose of this utility model realizes by following measure:
A kind of device of ultrasonic measurement object space: comprise the single-chip microcomputer that processing signals is used, at least two ultrasonic transmission/reception sensors, each sensor links to each other with single-chip microcomputer by transmission circuit.
This device also comprises LCD, and this LCD links to each other with single-chip microcomputer.
Each sensor links to each other with single-chip microcomputer by transmission circuit.Single-chip Controlling ultrasonic transmission/reception sensor sends ultrasound wave in turn, and the ultrasound wave that each sensor receives is delivered to single-chip microcomputer and handled after transmission circuit amplifies shaping.This device utilizes 12864 type lattice lcds screen that object space is shown, but liquid crystal display is not essential, can utilize communication interfaces such as TWI, USART that detection information is sent to other application circuits yet.
This device adopts Atmega16 as microcontroller (also can use other model single-chip microcomputers), uses timer to produce the 40KHz square wave, based on the mode received ultrasonic signal that interrupts, and calculates object space in single-chip microcomputer.Receiving circuit adopts CX20106A that ultrasonic signal is amplified shaping, and has the effect of other clutters of filtering.
This method can detect the position of a plurality of objects in effective investigative range simultaneously, single-chip microcomputer can calculate each object in effective range and the distance between each ultrasonic transmission/reception sensor, distance between combined sensor and the sensor constitutes several triangles, determines object space then.And this device can use the cheap bigger ultrasonic transmitter of emission angle, has saved instrument cost.
The measuring process of this ultrasonic measurement object space is as follows:
1) earlier send one section ultrasound wave by TR1, by TR1, TR2 reception, and to write down corresponding time of reception be t through object reflection back
11, t
12, t
13, T
11, T
12, T
13
2) send one section ultrasound wave by TR2 again, by TR1, TR2 reception, and to write down corresponding time of reception be t through object reflection back
21, t
22, t
23, T
21, T
22, T
23
3) whether satisfy T
11=t
21, T
12=t
22, T
13=t
23As not satisfying, institute is surveyed rejection of data;
4) at t
11, t
12, t
13Find out a data x, at T
21, T
22, T
23Find out a data y, at t
21, t
22, t
23In find out a data z, make x+y=2*z, then constitute a triangle by x, y and L, can determine the position of an object;
5) repeated for the 4th step, up to t
21, t
22, t
23Middle data are all used, and can determine the position of each object in the effective range.
Four, description of drawings:
Fig. 1 is the ultrasonic locating process flow diagram.
Fig. 2 makes the possible location point of object.
Fig. 3 makes the possible location point of object.
Fig. 4 determines the object space point.
Fig. 5 is the effective measurement zone synoptic diagram of device.
Fig. 6 is the ultrasonic transmission/reception circuit diagram.
Fig. 7 is single-chip microcomputer treatment circuit figure.
Fig. 8 is the ultrasonic Treatment program flow diagram.
Among the figure: TR1-ultrasonic transmission/reception sensor 1; TR2-ultrasonic transmission/reception sensor 2; Distance between L-TR1 and the TR2; A, B-object under test; D, E, F, G, H, the possible location point of I-object.
Five, embodiment:
1, ultrasonic locating principle analysis
This device needs two ultrasonic transmission/reception sensors, utilizes ultrasonic ranging by certain algorithm the distance calculation between each object and the sending and receiving sensor to be come out, and constitutes several triangles, and then the position of definite object.
The ultrasonic ranging principle is to utilize the flight time method (time of flight TOF), promptly detects the time that ultrasound wave comes and goes, and used time and ultrasound wave be by apart from being directly proportional, thereby calculates the distance of ultrasound wave institute warp.When the ultrasonic transmission/reception sensor sent a brief burst, timing began; When the ultrasonic transmission/reception sensor receives one when returning pulse, record obtains time value t.Then the distance of ultrasonic propagation is d=vt, and wherein d is the distance between sensor and the testee; V is the velocity of propagation of ultrasound wave in medium.
Can analyze in two kinds of situation by the distance relation between object and the sending and receiving sensor, that is: 1, all objects and arbitrary sending and receiving sensor distance do not wait; 2, have at least two objects to equate with a certain sending and receiving sensor distance.Can unite two into one by the above-mentioned as can be known two kinds of situations of the analysis of back, but the branch case study can be simplified the processing procedure to data.
1.1 all objects and arbitrary sending and receiving sensor distance do not wait
With any two articles explanation ultrasonic locating flow process (as shown in Figure 1) in the two dimensional surface
Sending and receiving sensor 1, sending and receiving sensor 2, two (also can be a plurality of) object A and the B in optional position are arranged among the figure, and sending and receiving sensor can send and receive ultrasound wave, and distance L is known between two sending and receiving sensors, links together by single-chip microcomputer.
Can arrange, use t
MnThe time of reception of expression sending and receiving sensor 1 is used T
MnThe ultrasound wave that the time of reception of expression sending and receiving sensor 2, subscript m are represented to receive is by the emission of which sending and receiving sensor, and which time echo is subscript n represent to receive.T for example
21Expression sending and receiving sensor 1 receives the 1st the used time of echo of ultrasound wave of being sent by sending and receiving sensor 2.
The first step: (shown in Fig. 1 (a)) sending and receiving sensor 1 sends one section ultrasound wave, and single-chip microcomputer picks up counting.
Second step: (shown in Fig. 1 (b)) ultrasound wave runs into object and produces reflection wave, and reflection wave is received by sending and receiving sensor 1 and sending and receiving sensor 2 respectively, and single-chip microcomputer is write down time of reception respectively.Because two objects are arranged in the investigative range,, and can't judge which reflected by objects ripple what receive earlier is this moment so each sending and receiving sensor can successively receive two sections reflection waves.Note sending and receiving sensor 1 successively receives that the time of reflection wave is t
11, t
12, sending and receiving sensor 2 successively receives that the time of reflection wave is T
11, T
12
The 3rd step: (shown in Fig. 1 (c)) sending and receiving sensor 2 sends one section ultrasound wave, and single-chip microcomputer restarts timing.
The 4th step: (shown in Fig. 1 (d)) ultrasound wave runs into object and produces reflection wave, and reflection wave is received by sending and receiving sensor 1 and sending and receiving sensor 2 respectively, and single-chip microcomputer is write down time of reception respectively.As described in second step, note sending and receiving sensor 1 successively receives that the time of reflection wave is t
21, t
22Sending and receiving sensor 2 successively receives that the time of reflection wave is T
21, T
22
Deal with data: as can be known by geometric relationship:
T
11＝t
21 (1)
T
12＝t
22 (2)
Utilize the validity that (1) (2) two formulas can judgment data, as not satisfying above-mentioned two formulas, possible cause is that the object speed of surveying has exceeded accuracy of instrument, should be with rejection of data.
With sending and receiving sensor 1 is the center of circle, with t
11/ 2, t
12/ 2 draw circle respectively for radius, are the center of circle with sending and receiving sensor 2 then, with T
21/ 2, T
22/ 2 draw circle respectively for radius, can draw four intersection point D, E, F, G, as shown in Figure 2.
Suppose t
11/ 2 are not equal to t
12/ 2, position that then can judgment object is at D, F or G, E, if promptly circular arc is intersected " rectangle " that the figure of gained is regarded distortion as, then the line of object present position can only be the diagonal line of " rectangle ".A bit whether two articles can be located in the residing position of object arbitrarily so only need judge D, E, F, G, because F point and sending and receiving sensor 1 and sending and receiving sensor 2 are nearest apart from sum, only need judge t
11/ 2 and T
21/ 2 and whether equal T
11If, equal, then the F point is the object space point, on the contrary the F point is not the object space point.So just determined the position of two articles.
1.2 have at least two objects to equate with a certain sending and receiving sensor distance
Above-mentioned analysis is to be based upon can draw under the condition of same number circular arc to two sending and receiving sensors, if this condition is false, for example to sending and receiving sensor 23 circular arcs (being to receive echo 3 times after sending and receiving sensor 2 sends one section ultrasound wave) that can draw, that is to say that two objects are identical with sending and receiving sensor 1 distance, will have following change so:
Sending and receiving sensor 2 will be received echo 3 times in second step, be made as T
11, T
12, T
13
Sending and receiving sensor 1 will be received echo 3 times in the 4th step, be made as t
21, t
22, t
23, sending and receiving sensor 2 will be received echo 3 times, be made as T
21, T
22, T
23
By geometric relationship as can be known:
T
11＝t
21 (3)
T
12＝t
22 (4)
T
13＝t
23 (5)
Draw the circular arc analysis as shown in Figure 3.
The possible location point of object has 6 as shown in Figure 3, i.e. D, E, F, G, H, I.Utilize T
11, T
12, T
13Perhaps t
21, t
22, t
23Can determine the position of object.If t for example
11/ 2 and T
21/ 2 sums equal t
21, can judge that then the F point is the object space point, otherwise the F point is not a location point.With t
21, t
22, t
23Being respectively major axis, is that focus is drawn ellipse with sending and receiving sensor 1,2, and elliptical orbit should pass through 3 points among D, E, F, G, H, the I, is the true location point of object.Suppose that elliptical orbit crosses E, G, I 3 points, as shown in Figure 4.
Then E, G, 3 of I are the object true location point.
If situation is further special, for example sending and receiving sensor 1 is received echo twice in second step, and sending and receiving sensor 2 is received echo three times, and sending and receiving sensor 1 is received echo three times in the 4th step, sending and receiving sensor 2 is received echo twice, and above-mentioned analytical approach is suitable equally.
2, measurement range
Each sending and receiving sensor all has its measurement range, and adopting the measurement device scope of this method is the common factor of two sending and receiving sensors, as shown in Figure 5.
3, the utility model is as follows to the object localization step:
1) earlier send one section ultrasound wave by TR1, by TR1, TR2 reception, and to write down corresponding time of reception be t through object reflection back
11, t
12, t
13, T
11, T
12, T
13
2) send one section ultrasound wave by TR2 again, by TR1, TR2 reception, and to write down corresponding time of reception be t through object reflection back
21, t
22, t
23, T
21, T
22, T
23
3) whether satisfy T
11=t
21, T
12=t
22, T
13=t
23As not satisfying, institute is surveyed rejection of data;
4) at t
11, t
12, t
13Find out a data x, at T
21, T
22, T
23Find out a data y, at t
21, t
22, t
23In find out a data z, make x+y=2*z, then can constitute a triangle by x, y and L, can determine the position of an object;
Repeated for the 4th step, up to t
21, t
22, t
23Middle data are all used, and can determine the position of each object in the effective range;
4, ultrasonic locating circuit:
As shown in Figure 6, the 40Khz ultrasonic signal is input to amplifying circuit by the INPUT end, amplifies the back through triode Q1, transformer TR1 and is launched by sending and receiving sensor TR1.Ultrasound wave runs into object and returns the back by the TR1 reception, because ultrasonic signal is fainter, amplitude was very little after dress was changed to electric signal, therefore at first will amplify through row.Ultrasonic signal is mixed with the noise in the environment inevitably in transmission course, the variation of ultrasonic transmission distance and angle also can cause the variation of signal level.Therefore, must carry out suitable conditioning to original signal during reception, reduce the influence of these factors as much as possible.Electric signal is through R1, and C1 delivers to U2, and U2 is a frequency-selecting amplifier, signal is carried out filtering amplify the back by the output of OUTPUT end.D1, D2 reverse parallel connection play amplitude limit by the effect because reflection wave signal a little less than, can't pass through D1, D2, reduced decay to reflected signal.And the transmitted wave signal is stronger, makes D3, D4 conducting, and then has shielded the influence of transmitted wave to U2.
The ultrasonic Treatment circuit as shown in Figure 7, single-chip microcomputer adopts Atmega16, power supply does not draw among the figure, can use direct current 5V stabilized voltage supply, the 8MHz crystal oscillator is with 12864 lattice lcds screen demonstration object space.Also can export detection information to other application circuit by the single chip communication interface without liquid crystal display.Single-chip microcomputer adopts timer 0 to produce the 40KHz square wave by the output in turn of OUTPUT1, OUTPUT2 end, receives ultrasonic signal by INPUT1, INPUT2 termination.
Because need with two sending and receiving sensors, so need two groups in the side circuit as the circuit among Fig. 6, be connected respectively at circuit among Fig. 7, be that INPUT meets OUTPUT1 in the single-chip microcomputer in the transmission circuit, OUTPUT meets INPUT1 in the single-chip microcomputer in the transmission circuit, and OUTPUT2, INPUT2 join in like manner other one group of transmission circuit and the single-chip microcomputer.Single-chip microcomputer is handled the back data can deliver to other application circuits by communication interfaces such as TWI, USART.
5, Single Chip Microcomputer (SCM) program is carried out flow process
Ultrasonic Treatment subprogram process flow diagram as shown in Figure 8 in the single-chip microcomputer.
With data t
11, t
12, t
13Deposit array t1[in], T
11, T
12, T
13Deposit T1[in], t
21, t
22, t
23Deposit t2[in], T
21, T
22, T
23Deposit T2[in].
Array r1[], r2[] be used for depositing video data.After single-chip microcomputer calculates certain object space, leave this object and TR1 distance in r1[], leave r2[in the TR2 distance], when liquid crystal display or other circuit need object information, read array r1[], r2[] corresponding data gets final product.
Can make coordinate on display screen, the image on the display screen is the object distribution situation in two sending and receiving sensor the place ahead two dimensional surfaces, and each point is all represented the position of object, and when measuring accuracy was higher, many naming a person for a particular job was linked to be line and demonstrates the profile of object.
6, explanation
1, because the aerial velocity of propagation temperature influence of ultrasound wave can be proofreaied and correct hyperacoustic speed according to V ≈ 331.4+0.607T, obtains bearing accuracy preferably;
2, because ultrasonic propagation velocity is subjected to inside even from weather easily, so this device is suitable for using in indoor environment;
3, mainly contain following several error source and influence measurement result: ultrasonic velocity error, circuit delay error, timing error.Wherein have the greatest impact with velocity error.
Claims (3)
1. the device of a ultrasonic measurement object space, it is characterized in that: it comprises the single-chip microcomputer that processing signals is used, at least two ultrasonic transmission/reception sensors, each sensor links to each other with single-chip microcomputer by transmission circuit.
2. according to the device of the described ultrasonic measurement object space of claim 1, it is characterized in that: it comprises two ultrasonic transmission/reception sensors.
3. according to the device of claim 1 or 2 described ultrasonic measurement object spaces, it is characterized in that: this device also comprises LCD, and this LCD links to each other with single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020242466XU CN201698020U (en) | 2010-06-30 | 2010-06-30 | Device using ultrasonic wave for measuring positions of objects |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020242466XU CN201698020U (en) | 2010-06-30 | 2010-06-30 | Device using ultrasonic wave for measuring positions of objects |
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| CN201698020U true CN201698020U (en) | 2011-01-05 |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881832A (en) * | 2010-06-30 | 2010-11-10 | 南京信息工程大学 | Method and device for measuring object position by ultrasonic wave |
| CN106772328A (en) * | 2016-12-28 | 2017-05-31 | 孔睿雯 | A kind of bionical bat sonar experimental system setup based on multiaxis head |
| CN112612003A (en) * | 2020-11-30 | 2021-04-06 | 南京信息工程大学 | Intelligent book sequencing device based on LED light waves |
-
2010
- 2010-06-30 CN CN201020242466XU patent/CN201698020U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881832A (en) * | 2010-06-30 | 2010-11-10 | 南京信息工程大学 | Method and device for measuring object position by ultrasonic wave |
| CN101881832B (en) * | 2010-06-30 | 2012-07-04 | 南京信息工程大学 | Method and device for measuring object position by ultrasonic wave |
| CN106772328A (en) * | 2016-12-28 | 2017-05-31 | 孔睿雯 | A kind of bionical bat sonar experimental system setup based on multiaxis head |
| CN112612003A (en) * | 2020-11-30 | 2021-04-06 | 南京信息工程大学 | Intelligent book sequencing device based on LED light waves |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110105 Termination date: 20120630 |