CN206496835U - A kind of pyroelectric sensor for detecting acoustical power - Google Patents
A kind of pyroelectric sensor for detecting acoustical power Download PDFInfo
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- CN206496835U CN206496835U CN201720161141.0U CN201720161141U CN206496835U CN 206496835 U CN206496835 U CN 206496835U CN 201720161141 U CN201720161141 U CN 201720161141U CN 206496835 U CN206496835 U CN 206496835U
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- polyvinylidene difluoride
- difluoride film
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- tank
- acoustical power
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Abstract
The utility model discloses a kind of new pyroelectric sensor for detecting acoustical power.The utility model is used as sensing element using polyvinylidene difluoride film, described polyvinylidene difluoride film is angularly disposed in tank, described tank uses polymethyl methacrylate materials, the inwall of tank is glued with stainless steel faceplate, tank is divided into two parts by polyvinylidene difluoride film, the top of polyvinylidene difluoride film is open zone, and the bottom of polyvinylidene difluoride film is the sound absorption back lining materials that acoustic energy is converted into heat energy by arrangement in citadel, citadel.The utility model carrys out the detection to ultrasonic transducer output acoustic power with the pyroelectric effect of pyroelectricity material.The utility model cost is low and need not reach thermal equilibrium state compared with the method that thermocouple surveys acoustical power, therefore response speed is substantially accelerated.
Description
Technical field
The utility model relates generally to new pyroelectric sensor, more particularly to a kind of new pyroelectricity for detecting acoustical power
Sensor.
Background technology
Ultrasonic Diagnosis has been increasingly becoming topmost medical consultations means.Especially in nearly more than ten year, the new skill of ultrasonic therapy
Art has obtained swift and violent development, is even more to have breakthrough progress especially in terms of high intensity focused ultrasound.It is high-strength focused super
Sound is a kind of noninvasive oncotherapy technology of non-invasi, using ultrasonic wave in biological tissue can focusing and penetrability
In physical characteristics, the focal regions that ultrasonic energy is focused on on internal lesions very little, transient temperature can rise in the region
To more than 65 DEG C.Therefore it can produce focal regions inner tissue on the premise of substantially damage no to focal regions normal surrounding tissue
Irreversible coagulation necrosis, so as to reach the purpose of " excision " or ablated tumor.Thus the medical treatment such as contrast MRI, CT, PET
Equipment, ultrasonic medical has simple operation, using economy, the features such as applied widely, so extensively by the joyous of doctor and patient
Meet.
Security and validity are two important indicators must being fulfilled for for the medicine equipment for the treatment of.And for such
The security measurement method of diagnostic equipment acoustical power have become current healthcare givers and various circles of society in the urgent need to guarantee.Ultrasound
Acoustical power is too low to be caused to treat no effect and too high, can bring needed in irreversible damage, therefore therapeutic process it is accurate
Control the size of threshold range.Under this demand situation, the measurement of ultrasonic power has its important practical significance.
But the measuring method to acoustical power mainly has radiation force method, optical method, calorifics method and hydrophone to scan at present
Method etc..What is be wherein widely used is to radiate force method, but the talent of the higher cost of its needs and high professional qualification, and radiant force
Balance measurement requires more strict, especially in terms of installation and transducer dimensions, so as to be had in clinical and user level
Limited.And there is the problem of service efficiency is relatively low in hydrophone scanning rule.
The content of the invention
The purpose of this utility model is to provide a kind of new pyroelectric sensor for detecting acoustical power, to solve the above-mentioned back of the body
The problem of being proposed in scape.
To achieve the above object, the utility model provides following technical scheme：
The utility model is used as sensing element using polyvinylidene difluoride film, it is characterised in that：Described Kynoar
Film is angularly disposed in tank, and the inclination angle of itself and horizontal plane is 15 °~25 °, and described tank uses polymethylacrylic acid
Methyl methacrylate material, the inwall of tank and bottom are glued with stainless steel faceplate, and tank is divided into two parts by polyvinylidene difluoride film, gather inclined
The top of fluoroethylene film is open zone, and the bottom of polyvinylidene difluoride film is to arrange to convert acoustic energy in citadel, citadel
For the sound absorption back lining materials of heat energy.
Described polyvinylidene difluoride film has two layers, and it is at the middle and upper levels non-polarised polyvinylidene difluoride film film, is used for
The ultrasonic power launched transducer is via the electric isolution of the polyvinylidene difluoride film of degassed water to lower floor, and lower floor is the poly- of polarization
Vinylidene film, the change of temperature after sound wave is absorbed for experiencing sound absorption back lining materials；The polyvinylidene difluoride film of polarization because
Pyroelectric effect and discharge electric charge or voltage, and drawn by gold electrode.
Furtherly, the polyvinylidene difluoride film of described polarization is arranged in array.
Furtherly, described inclination angle is 20 °.
Background technology is compared, and the utility model has an advantageous effect in that：
The utility model carrys out the detection to ultrasonic transducer output acoustic power with the pyroelectric effect of pyroelectricity material.Should
Utility model cost is low and need not reach thermal equilibrium state compared with the method that thermocouple surveys acoustical power, therefore response speed is obvious
Accelerate.Furthermore during sensor production with application can flexibly change shape and layout, add the model of application
Enclose and field, can be monitored in real time especially during high-strength focusing ultrasonic therapy.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present utility model：
Fig. 2 is the PVDF thin film of polarization；
In figure：1st, PMMA shells, 2, stainless steel faceplate, 3, array type PVDF thin film, 4, high acoustic absorption back lining materials, 5, polarization
PVDF thin film, 6, array element.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2：The utility model includes a PMMA（Polymethyl methacrylate）The sump case of material
1, each face in tank inside is pasted with certain thickness stainless steel faceplate 2.The array horizontal by 20 ° of angles is placed inside tank
Type PVDF（Kynoar）High acoustic absorption back lining materials 4 are flooded with below film 3, film.The present embodiment is by pyroelectricity
The acoustical power of the pyroelectric effect detection ultrasound of material.In order to realize the accurate measurement of acoustical power, sound wave is reduced in the sensor
The brought measurement loss by reflecting and scattering, design sensor is by non-polarised PVDF thin film, the PVDF thin film of polarization（Contain
Upper and lower gold electrode）With high acoustic absorption material composition.
Described non-polarised PVDF thin film is placed in the top of sensor, for the ultrasonic power launched transducer via
Electric isolution of the degassed water to the PVDF thin film 5 of polarization.And the PVDF thin film polarized is then the sensing element as sensor, it is in
Array arrangement, is made up of multiple array elements 6, is placed in after unpolarized PVDF thin film, is absorbed for experiencing sound-absorbing material after sound wave
The change of temperature, and discharge electric charge or voltage on its surface using pyroelectric effect.Further, this two classes film simultaneously with level
Placed in 20 ° of angles in the sink, to reduce influence of the standing wave to measurement in face.
High acoustic absorption material is then placed in after the PVDF thin film of polarization, absorbs sound wave and the acoustic energy of sound wave is converted into heat energy.
The stainless steel faceplate pasted in tank is even more to strengthen the reflection and refraction of sound wave internally.
During measurement, ultrasonic transducer can be sent out by the focused sound beam after the point certain point transmitting focusing ultrasonic wave
Raw scattering, it is rear to reach pyroelectric sensor surface.Due to fine, the most sound wave energy of the sound translative performance of upper strata PVDF thin film
It is enough smoothly to pass through PVDF thin film to reach in high acoustic absorption back lining materials.High acoustic absorption back lining materials are absorbed after sound wave, by acoustic energy
Be converted to heat energy.Again because lower floor's PVDF thin film and high acoustic absorption back lining materials are closely coupled, therefore the heat of contact interface can be straight
Connect and be delivered to lower floor PVDF surfaces.Now the PVDF surfaces with pyroelectric property can produce surface charge, be gathered by consuming
System, the pyroelectric charges can be recorded.The relation of acoustical power and pyroelectric charges can be set up by theoretical research, so as to push away
Calculate ultrasonic transducer transmitting sound power.
It is specific embodiment of the utility model below：
1）The structure design of pyroelectric sensor and making
Step 1）Select suitable pyroelectricity material.The pyroelectric effect being based on according to pyroelectric sensor, selection is closed
Suitable pyroelectricity material.Consider that the medium that ultrasonic transducer is propagated is water or human body, so required pyroelectricity material will have
The characteristics of sound transparency is preferable, therefore high molecular polymer PVDF is have selected as the sensing element of pyroelectric sensor.And it is
More preferable reception sound wave, is fabricated to array format to improve the precision of sensor by film.
Step 2）Select high acoustic absorption back lining materials.Sound wave enters in sound-absorbing material through film, and sound-absorbing material absorbs sound wave
Acoustic energy is converted into heat energy.There is a requirement that sound-absorbing material has higher acoustic absorptivity and high conversion efficiency, so that ensure will be exhausted
Most acoustic energy is converted into heat energy, and reduces reflection and refraction of the sound wave inside sound-absorbing material.
Step 3）Design tank.Sound wave is propagated in media as well or in sound-absorbing material and inevitably has acoustic wave segment
Reflection and refraction, design tank reduce acoustic wave transmission to the external world.Therefore tank material needs sound insulation property preferably and can be by
Sound wave is reflected inside return flume again.Therefore it have selected that sound insulation property is good, good insulating macromolecule transparent material in design
PMMA, and paste one layer of stainless steel increase reflection in outer casing inner wall.
Step 4）Design pyroelectricity material placement location.When PVDF thin film simple horizontal is placed, substantial amounts of sound wave is had anti-
Transducer face is emitted back towards to form standing wave.The generation of standing wave is reduced it is therefore necessary to change the placement location of film, using up can
Sound wave more than energy enters sound-absorbing material through film, so as to improve the sensitivity of sensor.Therefore by film horizontal by 20 °
Angle is placed.
2）Pyroelectric sensor performance evaluation
Step 1）Theoretical calculation.Set up by theory deduction between transducer transmitting sound power and pyroelectricity output signal
Relation.Find pyroelectricity signal in theory is influenceed by which factor, and how the change of acoustical power influences pyroelectricity signal
Change.In this, as the reference theoretical value of the sensor, for being contrasted with later experiments.
Step 2）Experiment.Transducer distance and sensor vertical are kept under conditions of constant, using same time, phase
Same frequency and identical ultrasonic transducer acoustical power, progress are repeated twice experiment, the pyroelectricity signal measured twice before and after comparing
Between difference, obtain the repetition linearity curve of the sensor.Under conditions of identical supersonic frequency, only change transducer output
During acoustical power.Pyroelectric sensor output voltage is obtained according to measurement, thus observed between pyroelectricity output voltage and acoustical power
Rule of conversion.It is same under conditions of keeping acoustical power constant, only strengthen the frequency of transducer.Observe pyroelectricity output electricity
Relation between pressure and frequency size.
Step 3）Contrast.By step 1) and step 2）Data contrasted, you can obtain the performance evaluation of the sensor.
Step 4）The evaluation of systematic uncertainty.The factor of systematic error is caused in experiment to be had a lot, be broadly divided into
Under it is several：Error caused by error caused by the temperature change of water, sound-absorbing material heat transfer process, entrant sound film is caused
Transmission error etc..
Claims (3)
1. a kind of pyroelectric sensor for detecting acoustical power, sensing element is used as using polyvinylidene difluoride film, it is characterised in that：
Described polyvinylidene difluoride film is angularly disposed in tank, and the inclination angle of itself and horizontal plane is 15 °~25 °, described tank
Using polymethyl methacrylate materials, the inwall of tank and bottom are glued with stainless steel faceplate, and polyvinylidene difluoride film is by water
Groove is divided into two parts, and the top of polyvinylidene difluoride film is open zone, and the bottom of polyvinylidene difluoride film is citadel, citadel
It is interior to arrange the sound absorption back lining materials that acoustic energy is converted into heat energy；
Described polyvinylidene difluoride film has two layers, and it is at the middle and upper levels non-polarised polyvinylidene difluoride film film, for exchanging
The ultrasonic power of energy device transmitting is via the electric isolution of the polyvinylidene difluoride film of degassed water to lower floor, and lower floor is the poly- inclined fluorine of polarization
Vinyl film, the change of temperature after sound wave is absorbed for experiencing sound absorption back lining materials；The polyvinylidene difluoride film of polarization is released because of heat
Electrical effect and discharge electric charge or voltage, and drawn by gold electrode.
2. a kind of pyroelectric sensor for detecting acoustical power according to claim 1, it is characterised in that：Described polarization
Polyvinylidene difluoride film is arranged in array.
3. a kind of pyroelectric sensor for detecting acoustical power according to claim 1, it is characterised in that：Described inclination angle
For 20.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720161141.0U CN206496835U (en) | 2017-02-22 | 2017-02-22 | A kind of pyroelectric sensor for detecting acoustical power |
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| CN201720161141.0U CN206496835U (en) | 2017-02-22 | 2017-02-22 | A kind of pyroelectric sensor for detecting acoustical power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679793A (en) * | 2017-02-22 | 2017-05-17 | 中国计量大学 | Novel pyroelectric sensor for detecting sound power |
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2017
- 2017-02-22 CN CN201720161141.0U patent/CN206496835U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679793A (en) * | 2017-02-22 | 2017-05-17 | 中国计量大学 | Novel pyroelectric sensor for detecting sound power |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170915 Termination date: 20190222 |
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| CF01 | Termination of patent right due to non-payment of annual fee |