KR20170057565A - the apparatus which use Ceramic tranducer with electric circuit which reduce Decay Time - Google Patents
the apparatus which use Ceramic tranducer with electric circuit which reduce Decay Time Download PDFInfo
- Publication number
- KR20170057565A KR20170057565A KR1020150160849A KR20150160849A KR20170057565A KR 20170057565 A KR20170057565 A KR 20170057565A KR 1020150160849 A KR1020150160849 A KR 1020150160849A KR 20150160849 A KR20150160849 A KR 20150160849A KR 20170057565 A KR20170057565 A KR 20170057565A
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- signal
- ceramic
- reverberation
- generated
- electric signal
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52079—Constructional features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52079—Constructional features
- G01S7/52082—Constructional features involving a modular construction, e.g. a computer with short range imaging equipment
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
The present invention reduces the reverberation time by minimizing the generation of reverberation waves limiting the performance of an apparatus that generates ultrasound signals using ceramics and analyzes the reflected waves reflected by the reflectors and grasps the state or characteristics of the reflectors It is a device that allows to generate a larger signal and to receive and interpret the reflection signal in a wider range.
[Document 1] p19e6.pdf (PIEZOELECTRIC CERAMIC SEMSORS (PIEZOTITE))
MURATA MANUFAFURING CO. Documents of LTD
[On-Line] http://www.symmetron.ru/suppliers/murata/sensors/p19e6.pdf
[Search date] November 15, 2015
The ultrasonic waves are generated by the ceramic oscillator and the ultrasonic waves reflected by the object are converted into electrical signals, so that the distance to the reflector and the state and characteristics of the reflector can be grasped.
In the case of ultrasonic wave, ceramic is used for the generating device or terminal device of the receiving device. The terminal device of the generating device and the terminal device of the receiving device may be used independently, but usually one terminal device is used.
In this case, after generating the signal by giving the generated electric signal to the terminal element, it receives that the reflected wave vibrates the element and generates the reflected electric signal.
If the terminal does not produce any electrical signal when the generated electrical signal is not sent, the reflected electrical signal can be interpreted from the moment the generated signal is stopped.
However, when a ceramic device is used to generate ultrasonic waves, after the generation of the electric signal is stopped due to the physical characteristics or the external characteristics of the ceramic material or a device for accommodating the material (hereinafter referred to as a transducer) The device generates an electrical signal, which is called a reverb signal.
The reflected signal can not be interpreted during the reverberation time.
Figure 1 shows the shape of the electrical signal at the measuring end of the transducer.
In Decay Time, the waveform is read, but the generated electrical signal is not applied.
If the echo waveform created by the reflected wave is superimposed on the Decay Time, it can not be determined whether it is an Echo waveform or a Decay waveform.
The transducer can be interpreted as an equivalent circuit as shown in Fig. 2 in order to analyze the generation phenomenon of this reverberation signal.
Simulation results in the same result as in Fig.
In the circuit of FIG. 2, when the connection terminal of the ceramic terminal device is connected to the 0 level for a short time after the generation of the generated electric signal, the reverberation signal is significantly reduced if components that are interpreted as the charged electric charges of the equivalent circuit are removed.
Moreover, if the load for measurement is not connected when the generated electrical signal is applied, it is possible to generate more vibration with the generated electrical signal of the same size, and the effect of reducing the reverberation signal can be seen.
By suppressing the reverberation wave and reducing the reverberation time, the device using the transducer can interpret the closer reflector.
In the case of an ultrasonic sensor of an automobile, the minimum detection distance of the rear sensor and the side sensor is different, and the maximum detection distance differs in proportion to the distance. In order to detect a close distance, the signal may be reduced to reduce the size of the reverberation wave, Sufficient backing to physically reduce.
The present invention can eliminate backing or remove reverberation with minimal backing.
With the present invention, it is possible to use both the rear sensor and the lateral sensor.
For hospital transducers, use backing to reduce reverberation.
In this case, the vibration caused by the generated electrical signal is attenuated.
When using the present invention, a larger vibration may be generated.
It can be more economical or allow you to measure deeper depths.
Figure 1 shows the waveform at the measuring end of the transducer.
Figure 2 shows the electrical equivalent circuit of a transducer.
Fig. 3 is a result of simulating Fig.
4 is a circuit for simulating the connection of the transducer measurement terminal (the connection terminal of the ceramic terminal) to the 0 level for a short time when the generated electric signal is not applied.
Fig. 5 shows the simulation result of Fig.
6 is a circuit for simulating the connection of a load for measurement and a short time connection with a zero level when a generated electrical signal is not applied
Figure 7 is the result of the simulation of Figure 6
Figure 8 is an example.
In Figure 8, 1 is the path where the generated electrical signal is applied, which is connected to the connection end of the ceramic terminal.
Figure 8-2 shows the load switch for the measurement, which is connected to the connection end of the ceramic terminal.
Figure 8-3 shows the load for the measurement, which is connected to the 0 level.
Figure 4, Figure 4, shows the measurement stage, which is connected to the connection end of the ceramic terminal.
8 is a ceramic terminal device, which is connected to the 0 level.
6 in Fig. 8 is a 0 level connection switch, which is connected to the connection terminal of the ceramic terminal.
A transducer with resonance at 90 kHz was measured and its equivalent circuit was constructed. The simulation circuit shown in Fig. 2 was created by setting the load resistance for measurement with reference to several circuits using 90 kHz.
To simulate the applied signal, we set up the transistor switch circuit and simulated it.
In Fig. 3, the application time of the generated electrical signal is represented by a square waveform.
The results of FIG. 3 are consistent with the actual observed waveform of FIG.
In this equivalent circuit, if the charge accumulated in the capacitor of the ceramic terminal device is removed, the reverberation wave will not be generated.
So, I designed the circuit as shown in Fig.
The point at which the reverberation wave is generated is when the generated electric waveform is not applied.
And because the stored charge is not so large, most of the charge will be removed even if it is connected to 0 level only for a short time.
4 is a circuit for simulating the connection of the transducer measurement terminal (the connection terminal of the ceramic terminal) to the 0 level for a short time when the generated electric signal is not applied.
In Fig. 5, it can be seen that the reverberation signal is significantly reduced.
Furthermore, the generated electrical signal can cause the ceramic terminal to vibrate, but it is also consumed through the load for measurement. If the load for the measurement is not connected while the generated electrical signal is applied, the larger signal can be generated .
6 is a circuit for simulating the connection of a load for measurement and a short time connection with a zero level when a generated electrical signal is not applied
Figure 7 shows the simulation results of Figure 6.
The results in FIG. 7 show a larger output waveform and fewer reverberation signals than the results in FIG.
The present invention can be used as a more economical, higher performance vehicle sensor.
The present invention can make a medical transducer more economical and perform better.
The present invention can replace a non-ferrous ceramic element with a weaker output than a ferroelectric ferrite to a ferroelectric ceramic element.
Generated electric signal: An electric waveform signal for generating vibration in the ceramic terminal element
Reflected wave signal: The electric signal generated in the ceramic terminal device due to the influence of the sound pressure of the reflected ultrasonic wave
Ceramic terminal device: a device which is adhered to or adhered to ceramics and ceramics, a device that generates vibration when an electric signal of a resonant frequency is applied, and generates an electric signal when a negative pressure of a resonant frequency is applied
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150160849A KR20170057565A (en) | 2015-11-17 | 2015-11-17 | the apparatus which use Ceramic tranducer with electric circuit which reduce Decay Time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150160849A KR20170057565A (en) | 2015-11-17 | 2015-11-17 | the apparatus which use Ceramic tranducer with electric circuit which reduce Decay Time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20170057565A true KR20170057565A (en) | 2017-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150160849A KR20170057565A (en) | 2015-11-17 | 2015-11-17 | the apparatus which use Ceramic tranducer with electric circuit which reduce Decay Time |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190059682A (en) * | 2017-11-23 | 2019-05-31 | 현대오트론 주식회사 | Ultrasonic processing device and method |
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2015
- 2015-11-17 KR KR1020150160849A patent/KR20170057565A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190059682A (en) * | 2017-11-23 | 2019-05-31 | 현대오트론 주식회사 | Ultrasonic processing device and method |
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