CN204010433U - The ultrasonic Doppler effect experimental provision that tests the speed - Google Patents
The ultrasonic Doppler effect experimental provision that tests the speed Download PDFInfo
- Publication number
- CN204010433U CN204010433U CN201420311758.2U CN201420311758U CN204010433U CN 204010433 U CN204010433 U CN 204010433U CN 201420311758 U CN201420311758 U CN 201420311758U CN 204010433 U CN204010433 U CN 204010433U
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- China
- Prior art keywords
- slide block
- air track
- transducer
- receiving transducer
- digital
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- Expired - Fee Related
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses a kind of ultrasonic Doppler effect experimental provision that tests the speed, the problem that cannot avoid existing between dolly and guide rail friction force existing to solve existing ultrasonic Doppler effect knotmeter.It comprises air track, digital millisecond counter, transmitting transducer, receiving transducer, signal source, analog signal amplifier, digital frequency meter, slide block, photoelectricity door, air track is provided with slide block, the side of air track is provided with photoelectricity door, on slide block, be equipped with receiving transducer, the end of air track is equipped with transmitting transducer, the surface of transmitting transducer and receiving transducer is parallel to each other, transmitting transducer is connected with signal source, the input end of analog signal amplifier is connected with receiving transducer, the output terminal of analog signal amplifier is connected with the input end of digital frequency meter, digital millisecond counter is connected with photoelectricity door.In the utility model device, slide block is made approximate linear uniform motion on air track, and this is better than making the effect of moving object with dolly in some experiments.
Description
Technical field
The utility model relates to the mechanics device in physics teaching, particularly a kind of speed experimental provision that utilizes ultrasonic Doppler effect to measure object.
Background technology
Ultrasonic Doppler effect is measured the speed of object and is tested the experiment that Shi Ge university must do.Generally offer the experimental project based on Doppler effect, need to again purchase corresponding experimental facilities, comprise complicated mechanical system and kinetic control system, expense is higher.This experiment comprehensive utilization is existing
Sound Velocity Measurements instrument and Air Track Experiment instrument, using amplifying circuit of analog signal and digital frequency meter as DATA REASONING unit, designs a set of easy Doppler effect speedometer device, to carry out the designability experiment that Doppler effect is relevant.
Existing ultrasonic Doppler is done moving object with dolly in testing the speed and testing, so that has friction force between dolly and guide rail, the poor effect of measurement, and there is the problem that set of equipments expense is high.
Utility model content
The purpose of this utility model is to provide a kind of easy ultrasonic Doppler effect experimental provision that tests the speed, the problem that cannot avoid existing between dolly and guide rail friction force existing to solve existing ultrasonic Doppler effect knotmeter.
Technical solutions of the utility model are as follows: a kind of ultrasonic Doppler effect experimental provision that tests the speed, comprise air track, digital millisecond counter, transmitting transducer, receiving transducer, signal source, analog signal amplifier, digital frequency meter, slide block, photoelectricity door, air track is provided with slide block, the side of air track is provided with photoelectricity door, on slide block, be equipped with receiving transducer, the end of air track is equipped with transmitting transducer, the surface of transmitting transducer and receiving transducer is parallel to each other, transmitting transducer is connected with signal source, the input end of analog signal amplifier is connected with receiving transducer, the output terminal of analog signal amplifier is connected with the input end of digital frequency meter, digital millisecond counter is connected with photoelectricity door.
The utility model device forms mechanical motion part by air track and slide block, must regulate air track level, at this moment the friction force between slide block and guide rail is very little, and slide block is made approximate linear uniform motion on air track, and this is better than making the effect of moving object with dolly in some experiments.The shading time while measuring on slide block shadow shield through photoelectricity door with digital millisecond counter, then goes out the width of shadow shield with vernier caliper measurement, calculate the speed of slide block, then to make comparisons with Doppler range rate measurement.The utility model device is simple, can reduce laboratory funds spending.
Accompanying drawing explanation
Fig. 1 is the test the speed structural representation of experimental provision of a kind of ultrasonic Doppler effect.
Reference numeral implication is as follows: air track (1), digital millisecond counter (2), transmitting transducer (S
1), receiving transducer (S
2), signal source (3), analog signal amplifier (4), digital frequency meter (5), slide block (6), photoelectricity door (7).
Embodiment
Below in conjunction with accompanying drawing, the utility model is further explained to explanation.
The ultrasonic Doppler effect experimental provision that tests the speed, comprises air track 1, digital millisecond counter 2, transmitting transducer S
1, receiving transducer S
2, signal source 3, analog signal amplifier 4, digital frequency meter 5, slide block 6, photoelectricity door 7, air track 1 is provided with slide block 6, the side of air track 1 is provided with photoelectricity door 7, is equipped with receiving transducer S on slide block 6
2, the end of air track 1 is equipped with transmitting transducer S
1, transmitting transducer S
1with receiving transducer S
2surface parallel to each other, transmitting transducer S
1be connected with signal source 3, the input end of analog signal amplifier 4 and receiving transducer S
2be connected, the output terminal of analog signal amplifier 4 is connected with the input end of digital frequency meter 5, and digital millisecond counter 2 is connected with photoelectricity door 7.
In present embodiment, signal source 3 is selected SBZ-A signal source dedicated, and digital millisecond counter is selected GB-9F vacuum tube millivoltmeter, transmitting transducer S
1with receiving transducer S
2utilize piezoelectric effect to convert the sine-wave oscillation electric signal of signal source output to ultrasonic vibration.
Concrete implementation step is as follows: utilize dynamic leveling method to regulate the level of air track 1.
The adjusting of signal source 3 output frequencies: regulate transmitting transducer S
1the surface of emission and receiving transducer S
2receiving plane parallel to each other, the driving signal frequency of signal source 3 outputs is adjusted to the resonant frequency point vicinity that laboratory provides transmitting transducer, make transmitting transducer have higher electricity-acoustic energy conversion efficiency, moving slider 6 is to a certain position, adjust the output signal frequency of signal source 3, with digital millisecond counter 2, observe receiving transducer S
2output voltage amplitude change, maximum at a certain Frequency point place voltage amplitude, this is stabilization signal frequency, is frequency optimum traffic point, writes down the output signal frequency f of signal source.
Experimental data is measured: receiving transducer S
2output signal be input to signal amplifier 4, after signal amplifier amplifies, be input to again digital frequency meter 5, measure receiving transducer
(S 2 )the ultrasonic frequency receiving, promotes slide block 6 gently, makes slide block on air track, do linear uniform motion, from digital frequency meter 5, measures the frequency f of receiving transducer output signal
', from digital millisecond counter 2, to measure shadow shield on slide block 6 simultaneously and pass through the shading time Δ t of photoelectricity door, repeated measurement is repeatedly.In experimentation, to observe the frequency of signal source dedicated output signal, when its frequency produces drift, again be transferred to resonance frequency.
When slide block is made uniform motion on guide rail, the ultrasonic signal that the ultrasonic transducer on slide block receives, because Doppler effect produces frequency change, is converted to electric signal, utilizes digital frequency meter to measure the frequency f of electric signal
', from signal source dedicated, the ultrasonic signal frequency f of read output signal source output, utilizes formula
(wherein v is the speed of object, and V is ultrasound wave velocity of wave at room temperature,
At this moment kinematic system belongs to the situation of the static motion of an observer of wave source, just can calculate the speed of object and slide block.
According to formula
calculate the speed of slide block movement as the actual speed of slide block, then with by formula
the ram speed calculating is made comparisons, and finds that error is less, in 2%.
Claims (1)
1. the ultrasonic Doppler effect experimental provision that tests the speed, is characterized in that: it comprises air track (1), digital millisecond counter (2), transmitting transducer (S
1), receiving transducer (S
2), signal source (3), analog signal amplifier (4), digital frequency meter (5), slide block (6), photoelectricity door (7), air track (1) is provided with slide block (6), the side of air track (1) is provided with photoelectricity door (7), and slide block is equipped with receiving transducer (S on (6)
2), the end of air track (1) is equipped with transmitting transducer (S
1), transmitting transducer (S
1) and receiving transducer (S
2) surface parallel to each other, transmitting transducer (S
1) be connected with signal source (3), the input end of analog signal amplifier (4) and receiving transducer (S
2) be connected, the output terminal of analog signal amplifier (4) is connected with the input end of digital frequency meter (5), and digital millisecond counter (2) is connected with photoelectricity door (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420311758.2U CN204010433U (en) | 2014-06-12 | 2014-06-12 | The ultrasonic Doppler effect experimental provision that tests the speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420311758.2U CN204010433U (en) | 2014-06-12 | 2014-06-12 | The ultrasonic Doppler effect experimental provision that tests the speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204010433U true CN204010433U (en) | 2014-12-10 |
Family
ID=52050399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420311758.2U Expired - Fee Related CN204010433U (en) | 2014-06-12 | 2014-06-12 | The ultrasonic Doppler effect experimental provision that tests the speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204010433U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106910396A (en) * | 2017-03-23 | 2017-06-30 | 西华师范大学 | Ripples DOPPLER EFFECT DEMONSTRATION INSTRUMENT |
| CN109493699A (en) * | 2018-12-04 | 2019-03-19 | 南京林业大学 | Wireless WIFI auto-ultrasonic Doppler effect experiment instrument |
-
2014
- 2014-06-12 CN CN201420311758.2U patent/CN204010433U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106910396A (en) * | 2017-03-23 | 2017-06-30 | 西华师范大学 | Ripples DOPPLER EFFECT DEMONSTRATION INSTRUMENT |
| CN109493699A (en) * | 2018-12-04 | 2019-03-19 | 南京林业大学 | Wireless WIFI auto-ultrasonic Doppler effect experiment instrument |
| CN109493699B (en) * | 2018-12-04 | 2022-12-09 | 南京林业大学 | Wireless WIFI automatic ultrasonic Doppler effect experimental instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20150612 |
|
| EXPY | Termination of patent right or utility model |