CN204575228U - A kind of bus passenger flow pick-up unit based on piezoelectric membrane - Google Patents
A kind of bus passenger flow pick-up unit based on piezoelectric membrane Download PDFInfo
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- CN204575228U CN204575228U CN201520239131.5U CN201520239131U CN204575228U CN 204575228 U CN204575228 U CN 204575228U CN 201520239131 U CN201520239131 U CN 201520239131U CN 204575228 U CN204575228 U CN 204575228U
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Abstract
The utility model relates to a kind of bus passenger flow pick-up unit based on piezoelectric membrane, comprise detection module, modulate circuit and processing unit, described detection module comprises two pieces of hard plates and at least one piezoelectric polyvinylidene fluoride polymeric membrane (PVDF) sensor, and described modulate circuit comprises charge integrating circuit, amplifying circuit, filtering circuit, zeroing circuit and power circuit.The utility model utilize PVDF piezoelectric sensor to experience pressure change that human bady gravitational causes, produce charge signal, changed by modulate circuit process, bus passenger flow volume is obtained again by Computer Analysis process, structure is simple, cost is low, wear-resistant and accuracy of detection is high, has larger promotional value.
Description
Technical field
The utility model relates to bus passenger flow detection field, relates to a kind of bus passenger flow pick-up unit based on piezoelectric membrane particularly.
Background technology
Due to China's public transport passenger train substantial amounts, the degree of crowding is high, therefore, detection statistics is carried out to the volume of the flow of passengers, traffic management department can be helped to understand each circuit bus carrying situation, planning is circuit more reasonably, and can prevent from causing potential safety hazard because of overload, saves social resources.Existing bus passenger flow pick-up unit has:
A. infrared light curtain sensor.This technology belongs to active infrared technology, sensor is arranged near bus door, certain region is covered by the infrared ray launching specific wavelength, and the light change reflected from passenger is detected with it by sensor, thus identify get on or off the bus direction and the number of passenger, this technology adopts self light source, impact by ambient temperature, light status is less, accuracy of detection is high, but equipment cost and technical threshold higher, and bus too crowded time, crowded crowd makes infrared light curtain technology can be influenced in the accuracy rate in get on or off the bus direction and counting;
B. vehicle load detecting sensor.It is setting pressure sensor on the air suspension or Leaf Spring Suspension of bus, detects the pressure of air bag, then can calculate the load capacity of air bag in conjunction with bladder support changes of section curve and temperature compensation, slope compensation scheduling algorithm.For leaf spring vehicle, by detecting the deflection after leaf spring pressurized, then the load capacity of leaf spring can be calculated in conjunction with the Diagram of change in pressure figure of leaf spring and slope compensation scheduling algorithm.The general assembly (TW) of carrying can be detected according to this method, more just can calculate compartment seating capacity according to the average weight of passenger.But when number on car is below 10 people, and when weight differences is larger per capita, accuracy rate can reduce, the more important thing is that vehicle load detection technique needs the suspension at the bottom of bus is installed, inconvenience is installed.
C. based on the passenger flow sensor of passive infrared Human Detection and the video technique based on image recognition.Passive infrared Human Detection is that the infrared radiation of pyroelectric sensor to human body is monitored, thus reaches the object of passenger's counting, and the shortcoming of this technology is the impact being subject to ambient temperature, light, and robustness is strong not.The method cost being obtained the number of the passenger that gets on or off the bus by video technique is higher, and being subject to the impact of body vibrations, light, the characteristic of image procossing determines algorithm calculated amount greatly, and dynamically discriminating processing requirements is high, make the performance of CPU can not be low, improve equipment cost.
Summary of the invention
The purpose of this utility model is to provide a kind of accuracy of detection high for overcoming above-mentioned deficiency, and antijamming capability is strong, the bus passenger flow pick-up unit based on piezoelectric membrane that durable and cost is low.
For this reason, the utility model discloses a kind of bus passenger flow pick-up unit based on piezoelectric membrane, comprise detection module, modulate circuit and processing unit, it is characterized in that: described detection module comprises two pieces of hard plates and at least one piezoelectric polyvinylidene fluoride polymeric membrane (PVDF, all represent with this english abbreviation below) sensor, described two pieces of hard plate overlaps, described PVDF piezoelectric sensor is located between two pieces of hard plates, described modulate circuit comprises charge integrating circuit, amplifying circuit, filtering circuit, zeroing circuit and power circuit, the signal output part of described PVDF piezoelectric sensor connects the input end of charge integrating circuit, the input end of the output termination amplifying circuit of described charge integrating circuit, the input end of the output termination filtering circuit of described amplifying circuit, the input end of the output termination zeroing circuit of described filtering circuit, the input end of the output termination processing unit of described zeroing circuit, the power output end of described power circuit respectively with charge integrating circuit, amplifying circuit, filtering circuit, zeroing circuit is connected with the power input of processing unit.
Further, described two hard plates are by being arranged on the block at hard plate edge and being arranged on the middle fixing overlap of cylinder bonding, and described voltolisation vinylidene polymeric membrane piezoelectric sensor is located between cylinder and hard plate.
Further, described PVDF piezoelectric sensor is equidistantly located on the axis of hard plate.
Further, the model of described PVDF piezoelectric sensor is DT2-028K w/rivets.
Further, described amplifying circuit is adjustable magnification amplifying circuit.
Further, the power output end of described power circuit and charge integrating circuit, amplifying circuit, filtering circuit, electric source filter circuit of going here and there between zeroing circuit and the power input of processing unit.
Advantageous Effects of the present utility model:
The utility model utilize PVDF piezoelectric sensor to experience pressure change that human bady gravitational causes, produces charge signal, carries out sampling analysis process by modulate circuit and processing unit, draw bus passenger flow amount, traffic management department can be helped to understand each circuit bus carrying situation, and planning is circuit more reasonably, and can prevent from causing potential safety hazard because of overload, save social resources, meanwhile, apparatus structure is simple, cost is low, antijamming capability is strong, and accuracy of detection is high, durable.
Accompanying drawing explanation
Fig. 1 is the structural framing schematic diagram of the utility model embodiment;
Fig. 2 (a) is the structural representation of the detection module of the utility model embodiment;
The structural representation of the PVDF piezoelectric sensor that Fig. 2 (b) is the utility model embodiment;
Fig. 3 is the PVDF piezoelectric sensor schematic layout pattern of the utility model embodiment;
Fig. 4 is the circuit theory diagrams of the modulate circuit of the utility model embodiment.
Embodiment
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
As shown in Figure 1, a kind of bus passenger flow pick-up unit of base piezoelectric membrane, comprise detection module 100, be one-chip computer in modulate circuit and processing unit 600(the present embodiment), described detection module 100 comprise two pieces with bus pedal flat rectangular body of a size hard plate (as shown in Figure 2 (a) shows, it is acrylic board in the present embodiment, also can be other hard plates such as steel plate in other embodiments) and at least one piezoelectric polyvinylidene fluoride polymeric membrane (PVDF) sensor (in the present embodiment, select U.S. MEAS Sensitive Object DT serial band to draw piezoelectric film sensor DT2-028K w/rivets, as shown in Fig. 2 (b), 101 is PVDF piezoelectric membrane, 102 is conductive layer, 103 is extension line, quantity is 3), described two pieces of acrylic boards are fixing overlapping (in the present embodiment with the acrylic cylinder bonding being arranged on centre by the rectangular block of acrylic being arranged on acrylic board edge, rectangular block and cylinder select acrylic material, can be one-body molded with acrylic board, reduce manufacturing cost), 3 PVDF piezoelectric sensors are located between acrylic cylinder and acrylic board, and be equidistantly distributed on the long axis of acrylic board, as shown in Figure 3, dark circles is PVDF piezoelectric sensor set-point, described modulate circuit comprises charge integrating circuit 200, amplifying circuit (being adjustable magnification amplifying circuit in the present embodiment) 300, filtering circuit 400, zeroing circuit 500 and power circuit 700, the extension line (signal output part) of PVDF piezoelectric sensor connects the input end of charge integrating circuit 200, the input end of the output termination adjustable magnification amplifying circuit 300 of charge integrating circuit 200, the input end of the output termination filtering circuit 400 of adjustable magnification amplifying circuit 300, the input end of the output termination zeroing circuit 500 of filtering circuit 400, the signal input part of the output termination processing unit 600 of zeroing circuit 500, the power output end of power circuit 700 respectively with charge integrating circuit 200, adjustable magnification amplifying circuit 300, filtering circuit 400, zeroing circuit 500 is connected with the power input of processing unit 600, in the present embodiment, in order to remove interference, at power output end and the charge integrating circuit 200 of power circuit 700, adjustable magnification amplifying circuit 300, filtering circuit 400, between the power input of zeroing circuit 500 and processing unit 600, string has electric source filter circuit 800.
As shown in Figure 4, wherein the model of operational amplifier U1A, U2A, U1B and U2B is LF353P to the circuit theory diagrams of the present embodiment modulate circuit.
The course of work of the present utility model: detection module is arranged on bus pedal, when passenger getting on/off, PVDF piezoelectric sensor exports impulse form charge signal after the stressed change of induction, utilize charge integrating circuit, after the charge signal of collection is carried out Integral Transformation, the voltage signal that output duration is longer, after being amplified by adjustable magnification amplifying circuit again, twice High frequency filter is carried out with filtering circuit number, the cutoff frequency of wave filter should be determined according to the natural mode shape of PVDF piezoelectric membrane, filtered signal carries out being transferred to one-chip computer after level adjustment through zeroing circuit again and carries out process computing, draw the passengers quantity of upper and lower public transport.
In the course of work, the chip of modulate circuit and one-chip computer are powered by 220V AC power, Hz noise can be introduced, need to carry out filtering to power supply, electric capacity C10 and C11 of two different sizes is selected to carry out parallel connection, wherein capacitance comparatively bulky capacitor C11 elimination low frequency wave, the electric capacity C10 elimination high frequency waves that capacitance is less.Meanwhile, obtain enough abundant data analysis by three-channel collection, each passage uses above-mentioned signal conditioning circuit.
Although specifically show in conjunction with preferred embodiment and describe the utility model; but those skilled in the art should be understood that; not departing from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection domain of the present utility model.
Claims (6)
1. the bus passenger flow pick-up unit based on piezoelectric membrane, comprise detection module, modulate circuit and processing unit, it is characterized in that: described detection module comprises two pieces of hard plates and at least one piezoelectric polyvinylidene fluoride polymeric sensing membrane device, described two pieces of hard plate overlaps, described piezoelectric polyvinylidene fluoride polymeric membrane piezoelectric sensor is located between two pieces of hard plates, described modulate circuit comprises charge integrating circuit, amplifying circuit, filtering circuit, zeroing circuit and power circuit, the signal output part of described piezoelectric polyvinylidene fluoride polymeric membrane piezoelectric sensor connects the input end of charge integrating circuit, the input end of the output termination amplifying circuit of described charge integrating circuit, the input end of the output termination filtering circuit of described amplifying circuit, the input end of the output termination zeroing circuit of described filtering circuit, the input end of the output termination processing unit of described zeroing circuit, the power output end of described power circuit respectively with charge integrating circuit, amplifying circuit, filtering circuit, zeroing circuit is connected with the power input of processing unit.
2. the bus passenger flow pick-up unit based on piezoelectric membrane according to claim 1, it is characterized in that: described two hard plates are by being arranged on the block at hard plate edge and being arranged on the middle fixing overlap of cylinder bonding, and described voltolisation vinylidene polymeric membrane piezoelectric sensor is located between cylinder and hard plate.
3. the bus passenger flow pick-up unit based on piezoelectric membrane according to claim 1, is characterized in that: described piezoelectric polyvinylidene fluoride polymeric membrane piezoelectric sensor is equidistantly located on the axis of hard plate.
4. the bus passenger flow pick-up unit based on piezoelectric membrane according to claim 1, is characterized in that: the model of described piezoelectric polyvinylidene fluoride polymeric membrane piezoelectric sensor is DT2-028K w/rivets.
5. the bus passenger flow pick-up unit based on piezoelectric membrane according to claim 1, is characterized in that: described amplifying circuit is adjustable magnification amplifying circuit.
6. the bus passenger flow pick-up unit based on piezoelectric membrane according to claim 1, is characterized in that: the power output end of described power circuit and charge integrating circuit, amplifying circuit, filtering circuit, electric source filter circuit of going here and there between zeroing circuit and the power input of processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520239131.5U CN204575228U (en) | 2015-04-20 | 2015-04-20 | A kind of bus passenger flow pick-up unit based on piezoelectric membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520239131.5U CN204575228U (en) | 2015-04-20 | 2015-04-20 | A kind of bus passenger flow pick-up unit based on piezoelectric membrane |
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| CN204575228U true CN204575228U (en) | 2015-08-19 |
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| CN201520239131.5U Expired - Fee Related CN204575228U (en) | 2015-04-20 | 2015-04-20 | A kind of bus passenger flow pick-up unit based on piezoelectric membrane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2580988A (en) * | 2019-03-19 | 2020-08-05 | Oxford Nanopore Tech Ltd | Current measurement apparatus, molecular entity sensing apparatus, method of measuring a current, method of sensing a molecular entity |
| CN114467797A (en) * | 2022-02-08 | 2022-05-13 | 江西省农业科学院农业经济与信息研究所 | Livestock sign monitoring device and system |
-
2015
- 2015-04-20 CN CN201520239131.5U patent/CN204575228U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2580988A (en) * | 2019-03-19 | 2020-08-05 | Oxford Nanopore Tech Ltd | Current measurement apparatus, molecular entity sensing apparatus, method of measuring a current, method of sensing a molecular entity |
| GB2580988B (en) * | 2019-03-19 | 2022-04-13 | Oxford Nanopore Tech Ltd | Current measurement apparatus, molecular entity sensing apparatus, method of measuring a current, method of sensing a molecular entity |
| CN114467797A (en) * | 2022-02-08 | 2022-05-13 | 江西省农业科学院农业经济与信息研究所 | Livestock sign monitoring device and system |
| CN114467797B (en) * | 2022-02-08 | 2023-02-03 | 江西省农业科学院农业经济与信息研究所 | Livestock sign monitoring device and system |
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| 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: 20150819 Termination date: 20180420 |
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| CF01 | Termination of patent right due to non-payment of annual fee |