WO2017214768A1 - 一种压电传感装置及宠物胸带 - Google Patents

一种压电传感装置及宠物胸带 Download PDF

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Publication number
WO2017214768A1
WO2017214768A1 PCT/CN2016/085442 CN2016085442W WO2017214768A1 WO 2017214768 A1 WO2017214768 A1 WO 2017214768A1 CN 2016085442 W CN2016085442 W CN 2016085442W WO 2017214768 A1 WO2017214768 A1 WO 2017214768A1
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WIPO (PCT)
Prior art keywords
piezoelectric
sensing device
sheet
piezoelectric sensing
signal
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Ceased
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PCT/CN2016/085442
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English (en)
French (fr)
Inventor
王忠山
周平
张立新
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Shenzhen Water World Co Ltd
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Shenzhen Water World Co Ltd
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Priority to PCT/CN2016/085442 priority Critical patent/WO2017214768A1/zh
Publication of WO2017214768A1 publication Critical patent/WO2017214768A1/zh
Anticipated expiration legal-status Critical
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/024—Measuring pulse rate or heart rate
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices

Definitions

  • the invention relates to the technical field of pet supplies, in particular to a piezoelectric sensing device and a pet chest strap.
  • the existing products for monitoring pet heart rate on the market generally use a large area of silicone needle to achieve skin contact with pets, and the friction between the silicone and the skin is increased to feel the heartbeat of the pet and transmitted to the test device for measuring the heart rate.
  • the rotation of the collar increases the measurement error, and since the collar rotates, it is necessary to design a large-area test device for measuring the heart rate.
  • ceramic piezoelectric sheets need to be distributed throughout the collar, or two-thirds of the collars need to be distributed with ceramic piezoelectric sheets to ensure that the ceramic piezoelectric sheets are located in the pet's heart during the rotation of the collar. Since the test device for measuring heart rate requires a large area distribution on the collar and requires silicone to directly contact the skin of the pet, the heart rate meter is not only costly but also affects the comfort of the pet.
  • the invention provides a piezoelectric sensing device and a pet chest strap, which aims to solve the problem that the existing collar has poor comfort when measuring pet heart rate.
  • the present invention is achieved by a piezoelectric sensing device comprising a piezoelectric sheet, a signal conditioning circuit and a central processing unit;
  • the piezoelectric sheet is in close contact with the object to be tested, and is used for sensing a pressure change of the object to be tested, and generates a corresponding electric charge according to the pressure change, and the change of the electric charge causes a change of a voltage signal at both ends of the piezoelectric piece.
  • the signal conditioning circuit is connected to the piezoelectric sheet for receiving a voltage signal generated by the piezoelectric sheet and amplifying the voltage signal;
  • the central processing unit is coupled to the signal conditioning circuit to convert the amplified voltage signal into a digital signal and an image signal that reflects a pressure change.
  • the piezoelectric sensing device further includes a storage unit connected to the central processing unit for storing the digital signal and the image signal reflecting the pressure change.
  • the piezoelectric sensing device further includes a radio frequency transceiver unit, the radio frequency transceiver unit is connected to the central processing unit, and configured to send the digital signal and the image signal when receiving a request .
  • the piezoelectric sheet includes a first silicone sheet, a second silica sheet, a PVDF film, and a wire;
  • the wires are respectively connected to both ends of the PVDF film
  • the PVDF film is disposed between the first silica gel sheet and the second silica gel sheet, and one side of the PVDF film is in close contact with the first silica gel sheet, and the other side of the PVDF film is closely attached to the Said on the second silica gel sheet;
  • the first silica gel sheet and the second silica sheet sheet seal the PVDF film and a portion of the wire.
  • the piezoelectric sensing device further includes a plastic upper case, a plastic lower case, an integrated circuit board, and a power source;
  • the power source is electrically connected to the integrated circuit board
  • the signal conditioning circuit and the central processing unit are integrated on the integrated circuit board;
  • the piezoelectric sheet is fixed on the plastic upper shell;
  • the plastic upper case and the plastic lower case are closed, and the inside of the plastic upper case and the plastic lower case have a cavity, and the integrated circuit board and the power source are placed in the cavity.
  • the piezoelectric sensing device further includes a waterproof silicone member for preventing water from entering the cavity, and a portion of the inner wall of the plastic lower case and contacting the upper case of the plastic has a groove.
  • the waterproof silicone member is placed in the recess.
  • the present invention also provides a pet chest strap comprising the piezoelectric sensing device of any of the above and a chest strap body, the piezoelectric sensing device being fixed to the chest strap body.
  • the pet chest strap further includes an adjustment buckle for adjusting the length of the chest strap body, and the adjustment buckle is placed on the chest strap body.
  • the piezoelectric sensing device senses the pressure change of the object to be tested by pressing the piezoelectric piece against the detecting portion of the object to be tested. Since the pressure piece is in the form of a sheet and has high sensitivity, the piezoelectric piece does not need to contact the pet. The skin directly touches the surface of the pet's hair to sense the beating of the heart, and the pet is comfortable and convenient when wearing the piezoelectric sensing device.
  • FIG. 1 is a schematic block diagram of a piezoelectric sensing device according to a first embodiment of the present invention
  • FIG. 2 is a schematic block diagram of a piezoelectric sensing device according to a second embodiment of the present invention.
  • FIG. 3 is a front structural view of a piezoelectric sensing device according to a third embodiment of the present invention.
  • Figure 4 is a cross-sectional view taken along line B-B of Figure 3;
  • Figure 5 is a schematic illustration of a pet wearing a pet chest strap.
  • FIG. 1 is a schematic block diagram of a piezoelectric sensing device according to a first embodiment.
  • the piezoelectric sensing device includes a piezoelectric sheet 10, a signal conditioning circuit 20, and a central processing unit 30.
  • the connection relationship between each device and the detailed description are as follows:
  • the piezoelectric sheet 10 is in close contact with the object to be tested for sensing the pressure change of the object to be tested, and generates a corresponding electric charge according to the pressure change, and the change of the electric charge causes a change in the voltage signal across the piezoelectric sheet 10.
  • the object to be tested may be a stationary object or a living object such as an animal.
  • the object to be tested may vibrate, beat, etc. due to its own or external factors.
  • the piezoelectric sensing device can detect the heartbeat of an animal, the vibration of a solid due to external causes, the vibration of the object itself, and the like.
  • the piezoelectric sheet 10 has a flat shape and can have a large contact surface when it comes into contact with an object to be tested.
  • the piezoelectric sheet 10 is sensitive to the touch and does not need to be in direct contact with the pet's skin.
  • the piezoelectric sheet 10 can be sensed only by placing the piezoelectric sheet 10 against the surface of the pet's hair.
  • the piezoelectric sheet 10 not only increases the comfort of contact feeling, but also improves the accuracy of detection.
  • the signal conditioning circuit 20 is connected to the piezoelectric sheet 10 for receiving a voltage signal generated by the piezoelectric sheet 10 and amplifying the voltage signal.
  • the central processing unit 30 is coupled to the signal conditioning circuit 20 to convert the amplified voltage signal into a digital signal and an image signal that reflects the pressure change.
  • FIG. 2 is a schematic diagram of a module of a piezoelectric sensing device according to a second embodiment of the present invention.
  • the piezoelectric sensing device may further include a storage unit 40 and a radio frequency transceiver unit 50.
  • the storage unit 40 is coupled to the central processing unit 30 for storing digital signals and image signals that reflect pressure changes.
  • the radio frequency transceiver unit 50 is connected to the central processing unit 30 for transmitting digital signals and image signals to the requesting party when receiving a request sent by the outside world.
  • the request to transmit may be a server side of a piezoelectric sensing device, a mobile terminal, or the like.
  • the piezoelectric sheet 10 in the piezoelectric sensing device can collect the heart rate signal of the pet, and then the collected heart rate signal is processed by the signal conditioning circuit 20 and transmitted to the central processing unit 30, which is processed by the central processing unit 30.
  • the digital signal and the image signal reflecting the heart rate change are transmitted to the mobile terminal through the radio frequency transceiver unit 50, and the mobile terminal analyzes the received digital signal and the image signal, and gives the heart rate information of the pet or the corresponding information according to the heart rate information of the pet.
  • the processing method is fed back to the owner of the pet in real time.
  • FIG. 3 is a schematic front view of a piezoelectric sensing device according to a third embodiment of the present invention.
  • the piezoelectric sensing device 2 is shaped like a rectangular parallelepiped, and has a cavity in the rectangular body. .
  • the piezoelectric sheet 10, the signal conditioning circuit 20, the central processing unit 30, and the like in the piezoelectric sensing device of the above embodiment are placed in a cavity.
  • the piezoelectric sensing device 2 can also be designed as a square or a cylinder, and the external configuration of the piezoelectric sensing device 2 is not particularly required.
  • FIG. 4 is a cross-sectional view taken along line B-B of FIG.
  • the piezoelectric sheet 10 of the piezoelectric sensing device 2 includes a first silicone sheet 101, a second silicone sheet 102, and PVDF (polyvinylidene). Fluoride, polyvinylidene fluoride film) film 103 and wire.
  • the wires are respectively connected to the two ends of the PVDF film 103. The wires are not shown in the figure.
  • the wires are taken out for electrical connection with the signal conditioning circuit 20, and the voltage change on the PVDF film 103 is fed back to the signal conditioning circuit 20.
  • the PVDF film 103 is placed between the first silica gel sheet 101 and the second silica gel sheet 102, and one side of the PVDF film 103 is closely attached to the first silica gel sheet 101. The other side of the PVDF film 103 is in close contact with the second silicone sheet 102.
  • the first silica gel sheet 101 and the second silica gel sheet 102 seal the PVDF film 103 and a part of the wires, and a part of the wires at both ends of the PVDF film 103 are exposed outside the first and second silica sheets 101, 102.
  • the PVDF film 103 is designed in the middle of the first silica gel sheet 101 and the second silica gel sheet 102, and is sealed by a silicone in-mold injection molding process.
  • the first silica gel sheet 101 and the second silica gel sheet 102 are closely attached to the PVDF film 103.
  • the surface of the first silica gel sheet 101 or the second silica gel sheet 102 is subjected to pressure, it can be directly transferred to the PVDF film 103.
  • the principle of the heart rate of the PVDF film 103 is: according to the piezoelectric characteristics of the PVDF film 103, when the heartbeat signal is measured using the PVDF film 103, since the sound wave propagates through the vibration, the sound wave passes through the silica gel sheet to reach the surface of the PVDF film 103, which causes the film. Strain is generated, so that charges of opposite magnitude and opposite polarity are generated on opposite faces. The magnitude of the generated charge is measured by measuring the voltage between the two faces. The change in voltage indirectly reflects the strength of the heart sound. .
  • the piezoelectric sensing device 2 may further include a plastic upper case 301, a plastic lower case 302, an integrated circuit board 304, and a power source 305 for convenient carrying or wearing.
  • Signal conditioning circuit 20, central processing unit 30, memory unit 40, and radio frequency transceiver unit 50 are all integrated on integrated circuit board 304.
  • the wires at both ends of the PVDF film 103 are electrically connected to the integrated circuit board 304.
  • Power source 305 is electrically coupled to integrated circuit board 304 to provide electrical energy to signal conditioning circuit 20, central processing unit 30, memory unit 40, and radio frequency transceiver unit 50.
  • the piezoelectric sheet 10 is fixed to the upper plastic case 301. Specifically, the second silicone sheet 102 is fixed on the outer surface of the upper plastic shell 301.
  • the first silicone sheet 101 is next to the neck of the pet.
  • the plastic upper case 301 and the plastic lower case 302 are closedly disposed, and the inside of the plastic upper case 301 and the plastic lower case 302 have a cavity, and the integrated circuit board 304 and the power source 305 are placed in the cavity.
  • the piezoelectric sensing device 2 further includes a waterproof silicone member 303.
  • the waterproof silicone member 303 is used to prevent water, sweat, saliva, and the like from entering the cavity.
  • the inner wall of the plastic lower case 302 and the portion in contact with the plastic upper case 301 have a groove, and the waterproof silicone member 303 is placed in the groove.
  • the waterproof silicone member 303 is located in the plastic. Between the upper case 301 and the plastic lower case 302, and between the plastic upper case 301 and the cover surface of the plastic lower case 302.
  • a pet chest strap includes the piezoelectric sensing device provided by any of the above embodiments and a chest strap body 401.
  • the piezoelectric sensing device 2 is fixed on the chest strap body 401.
  • the chest strap body 401 is fixed on the plastic upper shell 301 or the plastic lower shell 302.
  • the chest strap body 401 fixes the piezoelectric sensor device 2 to the heart portion of the pet 4. Since the chest strap body 401 is bypassed from the forefoot of the pet 4 and worn on the neck, the chest strap body 401 does not rotate greatly with the movement of the pet, so that the piezoelectric sensing device 2 can be relatively stably In the part of the heart of the pet 4 chest.
  • the pet chest strap may further include an adjustment buckle 402 disposed on the chest strap body 401 for adjusting the length of the chest strap body 401.
  • adjusting the adjustment buckle 402 can adjust the length of the chest strap body 401 to facilitate the wearing of the pets 4 of different body shapes.
  • the piezoelectric sensor device 2 has a side of the silicone against the neck of the pet 4, in this embodiment, that is, the first silicone sheet 101 is next to the neck of the pet 4.
  • the piezoelectric sensing device 2 places the first silicone sheet 101 next to the pet to be tested, and the pet heart sound is transmitted to the PVDF film 103 through the first silicone sheet, thereby causing the PVDF film 103 to have the same size on opposite sides.
  • the opposite polarity of charge, the voltage change across the PVDF film 103 is connected to the signal conditioning circuit 20 for processing, and then the central processing unit 30 analyzes the processed voltage signal to obtain the monitored heart rate change information of the pet. . Since the PVDF film 103 is sensitive to the touch, the change of the pet's heartbeat can be accurately sensed even in the case of the pet's hair, so that the first silicone sheet 101 does not need to be in direct contact with the pet's skin, and only needs to be in close contact with the pet.
  • the surface of the hair is just right, which increases the comfort of the pet.
  • the PVDF film 103 can monitor a signal with a wide frequency band, and has high monitoring sensitivity and good impact resistance.
  • the piezoelectric sensing device also has the advantages of small size, light weight, low cost and the like.

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Abstract

一种压电传感装置及宠物胸带，该压电传感装置包括压电片（10）、信号调理电路（20）和中央处理单元（30）；所述压电片（10）紧贴着待测物体，用于感应待测物体的压力变化，并根据所述压力变化产生相应的电荷，所述电荷的变化引起所述压电片（10）两端电压信号的变化；所述信号调理电路（20）与所述压电片（10）相连接，用于接收所述压电片（10）产生的电压信号，并对所述电压信号进行放大；所述中央处理单元（30）与所述信号调理电路（20）相连接，将所述放大后的电压信号转换成数字信号和反映压力变化的图像信号。该压电传感装置方便实时监测心率，使用和佩戴方便，且佩戴舒适。

Description

一种压电传感装置及宠物胸带 技术领域
本发明涉及宠物用品技术领域，尤其涉及一种压电传感装置及宠物胸带。
背景技术
随着生活水平的提高，越来越多的人喜欢上了饲养宠物，如狗、猫、兔子等，并且人们对宠物的身体健康也越来越重视。如何实现实时监控爱心的宠物的生理状态，成了宠物爱好者所关注的问题。宠物的生理状态，可以通过宠物的心率来反映，因此，如何监控心率为人们所重点关注的问题了。
目前，市场上现有的监控宠物心率的产品一般是以大面积的硅胶针来实现对宠物的皮肤接触，通过硅胶跟皮肤接触来增加摩擦，从而感受宠物的心跳并传送给测量心率的测试器件，宠物在佩戴项圈时，项圈的转动会增加测量的误差，并且由于项圈会转动，需要设计大面积的测量心率的测试器件。比如，需要在整个项圈中都分布有陶瓷压电片，或者三分之二的项圈需要分布有陶瓷压电片，才能确保项圈在转动过程中有陶瓷压电片位于宠物的心脏部位。由于测量心率的测试器件需要在项圈上大面积的分布，并且需要硅胶直接跟宠物的皮肤接触，因此这种心率计不但成本高，还影响宠物佩戴的舒适度。
 技术问题
本发明提供一种压电传感装置及宠物胸带，旨在解决现有的项圈在测量宠物心率时舒适度差的问题。
 技术解决方案
本发明是这样实现的，一种压电传感装置，包括压电片、信号调理电路和中央处理单元；
所述压电片紧贴着待测物体，用于感应待测物体的压力变化，并根据所述压力变化产生相应的电荷，所述电荷的变化引起所述压电片两端电压信号的变化；
所述信号调理电路与所述压电片相连接，用于接收所述压电片产生的电压信号，并对所述电压信号进行放大；
所述中央处理单元与所述信号调理电路相连接，将所述放大后的电压信号转换成数字信号和反映压力变化的图像信号。
进一步地，所述压电传感装置还包括存储单元，所述存储单元与所述中央处理单元相连接，用于存储所述数字信号和所述反映压力变化的图像信号。
进一步地，所述压电传感装置还包括射频收发单元，所述射频收发单元与所述中央处理单元相连接，用于在接收到请求时，将所述数字信号和所述图像信号进行发送。
进一步地，所述压电片包括第一硅胶片、第二硅胶片、PVDF薄膜和导线；
所述导线分别接在所述PVDF薄膜的两端上；
所述PVDF薄膜置于所述第一硅胶片和所述第二硅胶片之间，并且所述PVDF薄膜其中的一面紧贴在所述第一硅胶片上，所述PVDF薄膜另外一面紧贴在所述第二硅胶片上；
所述第一硅胶片和所述第二硅胶片将所述PVDF薄膜和部分导线密封。
进一步地，所述压电传感装置还包括塑胶上壳、塑胶下壳、集成电路板和电源；
所述电源与所述集成电路板电连接；
所述信号调理电路和所述中央处理单元集成在所述集成电路板上；
所述压电片固设于所述塑胶上壳上；
所述塑胶上壳和所述塑胶下壳盖合设置，所述塑胶上壳和塑胶下壳的内部具有空腔，所述集成电路板和所述电源置于所述空腔内。
进一步地，所述压电传感装置还包括用于防止水进入到所述空腔内的防水硅胶件，所述塑胶下壳的内壁且与所述塑胶上壳相接触的部位具有凹槽，所述防水硅胶件置于所述凹槽内。
本发明还提供一种宠物胸带，该宠物胸带包括上述任一所述的压电传感装置以及胸带本体，所述压电传感装置固设于所述胸带本体上。
进一步地，所述宠物胸带还包括用于调节所述胸带本体长度的调节扣，所述调节扣置于所述胸带本体上。
 有益效果
所述的压电传感装置将压电片紧贴着待测物体的检测部位来感应待测物体的压力变化，由于压力片为片状且灵敏度高，因此该压电片不需要接触到宠物的皮肤，直接与宠物的毛发表面接触即可感应到心脏的跳动，宠物在佩带压电传感装置时舒适、方便。
 附图说明
图1是本发明第一种实施例提供的压电传感装置的模块示意图；
图2是本发明第二种实施例提供的压电传感装置的模块示意图；
图3是本发明第三种实施例提供的压电传感装置的正面结构示意图；
图4是沿图3标示的B-B方向的剖视示意图；
图5是宠物佩戴上宠物胸带的示意图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
请参阅图1，图1为第一种实施例提供的压电传感装置的模块示意图。该压电传感装置包括压电片10、信号调理电路20和中央处理单元30。各个器件之间的连接关系及详细说明如下：
压电片10紧贴着待测物体，用于感应待测物体的压力变化，并根据压力变化产生相应的电荷，电荷的变化引起压电片10两端的电压信号的变化。
待测物体可以是静止的物体，也可以是活的物体，比如动物。待测物体会由于本身或者外界因素发生振动、跳动等。又如：该压电传感装置可以检测动物的心跳、由于外界原因引起的固体的振动、物体本身的振动等。
压电片10为扁平状，在与待测物体相接触时，能有较大的接触面。压电片10由于感应灵敏，不需要直接接触到宠物的皮肤，只需将压电片10紧挨着宠物的毛发表面即可感应到心跳。该压电片10不仅增加了接触体感的舒适度，还提高了检测的精确度。
信号调理电路20与压电片10相连接，用于接收压电片10产生的电压信号，并对电压信号进行放大。
中央处理单元30与信号调理电路20相连接，将放大后的电压信号转换成数字信号和反映压力变化的图像信号。
如图2所示，为本发明第二种实施例提供的压电传感装置的模块示意图。在第一种实施例的基础上，压电传感装置还可以包括存储单元40和射频收发单元50。存储单元40与中央处理单元30相连接，用于存储数字信号和反映压力变化的图像信号。射频收发单元50与中央处理单元30相连接，用于在接收到外界发送的请求时，将数字信号和图像信号进行发送给请求方。例如，发送请求的可以是压电传感装置的服务器端、移动终端等。
该压电传感装置中的压电片10可以对宠物的心率信号采集，然后将采集到的心率信号通过信号调理电路20处理后传输到中央处理单元30，中央处理单元30将处理后得到的数字信号和反映心率变化的图像信号通过射频收发单元50发送到移动终端，移动终端对接收到的数字信号和图像信号进行分析处理，并将宠物的心率信息或者根据宠物的心率信息给出的相应的处理方法实时反馈给宠物的主人。
请参阅图3，图3为本发明第三种实施例提供的压电传感装置的正面结构示意图，本实施例中将压电传感装置2设置为类似长方体的形状，长方体内具有空腔。上述实施例压电传感装置中的压电片10、信号调理电路20、中央处理单元30等置于空腔内。当然，也可以将压电传感装置2设计为正方体或者圆柱体等，对压电传感装置2的外形结构并没有做特别的要求。
请参阅图4，图4为沿图3标示的B-B方向的剖视示意图。该压电传感装置2的压电片10包括第一硅胶片101、第二硅胶片102、PVDF（polyvinylidene fluoride，聚偏二氟乙烯膜）薄膜103和导线。导线分别接在PVDF薄膜103的两端上，导线没有在图中标示出来，导线引出是为了与信号调理电路20电连接，将PVDF薄膜103上的电压变化反馈给信号调理电路20。
PVDF薄膜103置于第一硅胶片101和第二硅胶片102之间，并且PVDF薄膜103其中的一面紧贴在第一硅胶片101上， PVDF薄膜103另外一面紧贴在第二硅胶片102上。第一硅胶片101和第二硅胶片102将PVDF薄膜103和部分导线密封，PVDF薄膜103两端的部分导线裸露在第一、第二硅胶片101、102的外面。
具体的，PVDF薄膜103设计在第一硅胶片101和第二硅胶片102中间，通过硅胶模内注塑的工艺实现密封设置，第一硅胶片101、第二硅胶片102均与PVDF薄膜103紧密贴合，第一硅胶片101或者第二硅胶片102的表面受到压力时，能直接传递到PVDF薄膜103上。
PVDF薄膜103测心率的原理为：根据PVDF薄膜103的压电特性，使用PVDF薄膜103测量心跳信号时，由于声波是通过振动来传播的，声波透过硅胶片到达PVDF薄膜103表面时会使薄膜产生应变，于是在相对的两个面上会产生出大小相同极性相反的电荷，通过测量两个面间的电压来测量所产生的电荷的大小，电压的变化间接地反应出心音的强弱。
为了方便携带或者佩戴，压电传感装置2还可以包括塑胶上壳301、塑胶下壳302、集成电路板304和电源305。信号调理电路20、中央处理单元30、存储单元40和射频收发单元50均集成在集成电路板304上。PVDF薄膜103两端的导线与集成电路板304电连接。电源305与集成电路板304电连接，为信号调整电路20、中央处理单元30、存储单元40和射频收发单元50提供电能。压电片10固设于塑胶上壳301上。具体的，第二硅胶片102固设于塑胶上壳301的外表面。在宠物佩戴上该压电传感装置2后，第一硅胶片101紧挨着宠物的脖子。塑胶上壳301和塑胶下壳302盖合设置，塑胶上壳301和塑胶下壳302的内部具有空腔，集成电路板304和电源305置于空腔内。
压电传感装置2还包括防水硅胶件303。防水硅胶件303用于防止水、汗液、唾液等进入到空腔内。塑胶下壳302的内壁且与塑胶上壳301相接触的部位具有凹槽，防水硅胶件303置于凹槽内，当塑胶上壳301和塑胶下壳302盖合时，防水硅胶件303位于塑胶上壳301和塑胶下壳302之间，且位于塑胶上壳301与塑胶下壳302的盖合面之间。
请参阅图5，一种宠物胸带，包括上述任一实施例提供的压电传感装置以及胸带本体401，压电传感装置2固设于胸带本体401上。具体的，胸带本体401固设于塑胶上壳301或者塑胶下壳302上。在佩戴时，胸带本体401将该压电传感装置2固设于宠物4的心脏部位。由于胸带本体401从宠物4的前脚处绕过并戴在脖子上，因此胸带本体401不会随着宠物的运动而发生大幅度的转动，从而能使压电传感装置2相对稳定地处于宠物4胸前心脏的部位。
该宠物胸带还可以包括调节扣402，调节扣402置于胸带本体401上，用于调节胸带本体401长度。在将胸带本体401戴在宠物4的脖子上后，调节调节扣402可以调整胸带本体401的长短，以方便不同身形的宠物4佩戴。在佩戴时，压电传感装置2上有硅胶的一面挨着宠物4的脖子，本实施例中，也就是第一硅胶片101紧挨着宠物4的脖子。
该压电传感装置2将第一硅胶片101紧挨着需要测试的宠物，宠物心音通过第一硅胶片传到PVDF薄膜103上，从而引起PVDF薄膜103相对两个面上产生出大小相同极性相反的电荷，通过导线将PVDF薄膜103两端的电压变化接到信号调理电路20上进行处理，然后由中央处理单元30对处理后的电压信号进行分析即可得到被监测到宠物的心率变化信息。由于PVDF薄膜103感应灵敏，因此在隔着宠物的毛发的情况下也能准确地感应到宠物心跳的变化，因此不需要将第一硅胶片101直接接触宠物的皮肤，只需紧贴着宠物的毛发表面即可，从而增加了宠物佩戴的舒适度。PVDF薄膜103能监测到频带较宽的信号，且监测灵敏度高，抗冲击性能好。该压电传感装置同时也具有体积小、重量轻、成本低等优点。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (8)

  1. 一种压电传感装置，其特征在于，包括压电片、信号调理电路和中央处理单元；
    所述压电片紧贴着待测物体，用于感应待测物体的压力变化，并根据所述压力变化产生相应的电荷，所述电荷的变化引起所述压电片两端电压信号的变化；
    所述信号调理电路与所述压电片相连接，用于接收所述压电片产生的电压信号，并对所述电压信号进行放大；
    所述中央处理单元与所述信号调理电路相连接，将所述放大后的电压信号转换成数字信号和反映压力变化的图像信号。
  2. 根据权利要求1所述的压电传感装置，其特征在于，所述压电传感装置还包括存储单元，所述存储单元与所述中央处理单元相连接，用于存储所述数字信号和所述反映压力变化的图像信号。
  3. 根据权利要求1所述的压电传感装置，其特征在于，所述压电传感装置还包括射频收发单元，所述射频收发单元与所述中央处理单元相连接，用于在接收到请求时，将所述数字信号和所述图像信号进行发送。
  4. 据权利要求1所述的压电传感装置，其特征在于，所述压电片包括第一硅胶片、第二硅胶片、PVDF薄膜和导线；
    所述导线分别接在所述PVDF薄膜的两端上；
    所述PVDF薄膜置于所述第一硅胶片和所述第二硅胶片之间，并且所述PVDF薄膜其中的一面紧贴在所述第一硅胶片上，所述PVDF薄膜另外一面紧贴在所述第二硅胶片上；
    所述第一硅胶片和所述第二硅胶片将所述PVDF薄膜和部分导线密封。
  5. 据权利要求1至4任一所述的压电传感装置，其特征在于，所述压电传感装置还包括塑胶上壳、塑胶下壳、集成电路板和电源；
    所述电源与所述集成电路板电连接；
    所述信号调理电路和所述中央处理单元集成在所述集成电路板上；
    所述压电片固设于所述塑胶上壳上；
    所述塑胶上壳和所述塑胶下壳盖合设置，所述塑胶上壳和塑胶下壳的内部具有空腔，所述集成电路板和所述电源置于所述空腔内。
  6. 根据权利要求5所述的压电传感装置，其特征在于，所述压电传感装置还包括用于防止水进入到所述空腔内的防水硅胶件，所述塑胶下壳的内壁且与所述塑胶上壳相接触的部位具有凹槽，所述防水硅胶件置于所述凹槽内。
  7. 一种宠物胸带，其特征在于，包括权利要求1至6任一所述的压电传感装置以及胸带本体，所述压电传感装置固设于所述胸带本体上。
  8. 根据权利要求7所述的宠物胸带，其特征在于，该宠物胸带还包括用于调节所述胸带本体长度的调节扣，所述调节扣置于所述胸带本体上。
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