Parameter testing equipment of transducer

Abstract

The utility model discloses a transducer parameter test equipment, including LCR tester, first on-off circuit, second on-off circuit, power amplifier board and oscilloscope or AP audio tester, LCR tester is connected with transducer through first on-off circuit, power amplifier board is connected with transducer through second on-off circuit, oscilloscope or AP audio tester is connected with power amplifier board, and the oscilloscope or AP audio tester is connected with the power amplifier board. The testing equipment can respectively carry out LCR parameter testing, electrical parameter testing and acoustic parameter testing on the transducer according to needs. According to the utility model, through integration of a plurality of test modules and an automation technology, a plurality of performance indexes of the transducer can be comprehensively evaluated in one test device according to needs, test performance diversification is realized, test efficiency and precision are substantially improved, and data support for comprehensive performance evaluation is provided for design and optimization of the transducer.

Description

TECHNICAL FIELD

[0001] The utility model relates to test equipment technical field, concretely relates to a parameter test equipment of transducer. BACKGROUND

[0002] Transducer is the device that one form of energy is converted into another, is widely used in acoustics, medicine, industry detects etc. To ensure that the performance of transducer meets the design requirements, it must be tested comprehensively.

[0003] However, the existing transducer test technology has the following problems: 1, test performance is single: the traditional transducer test scheme can usually only evaluate single performance index, such as sensitivity, frequency response or distortion degree etc. This single test method cannot comprehensively reflect the comprehensive performance of transducer, leading to the application range of test result being limited. 2, test efficiency is low: because the test method is single, usually needs multiple tests to obtain multiple performance indexes of transducer, which not only increases the test time, but also can lead to the inconsistency of test result. 3, test precision is insufficient: single test scheme often depends on specific test conditions, is difficult to carry out consistent test under different environments, thereby affecting the accuracy and reliability of test result. 4, lack of comprehensive evaluation: the prior art lacks a comprehensive test scheme that can simultaneously evaluate multiple performance indexes of transducer, cannot provide comprehensive data support for the design and optimization of transducer.

[0004] Therefore, a new type of transducer test equipment needs to be researched to solve the problems of single test performance, low test efficiency, insufficient test precision and lack of comprehensive evaluation of the above-mentioned transducer test technology. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a transducer parameter test equipment with multiple test performances, high test efficiency, high test precision and comprehensive evaluation of multiple performance indexes of transducer.

[0006] To achieve the above-mentioned purpose, the utility model provides a transducer parameter test equipment, which comprises:

[0007] LCR tester;

[0008] First on-off circuit, the LCR tester is connected with transducer through the first on-off circuit;

[0009] Second on-off circuit;

[0010] Power amplifier board, the power amplifier board is connected with transducer through the second on-off circuit;

[0011] Oscilloscope or AP audio tester, the oscilloscope or AP audio tester is connected with the power amplifier board;

[0012] When testing LCR parameters, the LCR tester and the transducer are connected through the first switch circuit, while the oscilloscope or the AP audio tester is disconnected from the transducer through the second switch circuit; when testing electrical parameters, the LCR tester is disconnected from the transducer through the first switch circuit, while the oscilloscope and the transducer are connected through the second switch circuit; when testing acoustic parameters, the LCR tester is disconnected from the transducer through the first switch circuit, while the AP audio tester and the transducer are connected through the second switch circuit.

[0013] In a preferred embodiment, the transducer is an ultrasonic transducer, and / or the transducer is an electrostatic ultrasonic transducer, and / or the transducer is a full-transparent electrostatic ultrasonic transducer.

[0014] In a preferred embodiment, the transducer is a full-transparent electrostatic ultrasonic transducer, and when testing LCR parameters, a DC high-voltage power supply with a voltage greater than or equal to 300 V is connected to the transducer.

[0015] In a preferred embodiment, the oscilloscope is connected to the power amplifier board through a current probe and through a voltage probe, and / or the oscilloscope is connected to the power amplifier board through a current probe, and the current probe is connected to the power amplifier board through the second switch circuit; the oscilloscope is connected to the power amplifier board through a voltage probe, and the voltage probe is connected to the power amplifier board through the first switch circuit.

[0016] In a preferred embodiment, the transducer includes one or more sound-emitting channels, the power amplifier board includes one or more output channels, the first switch circuit includes a first grounding switch and at least one first switch, the grounding end of the LCR tester is connected to the negative electrode of the transducer through the first grounding switch, and the detection input end of the LCR tester is connected to the corresponding sound-emitting channel of the transducer through the first switch; the second switch circuit includes a second grounding switch and at least one second switch, the grounding end of the power amplifier board is connected to the negative electrode of the transducer through the second grounding switch, and the output channel of the power amplifier board is connected to the corresponding sound-emitting channel of the transducer through the second switch.

[0017] In a preferred embodiment, when testing the LCR parameters, the detection input of the LCR tester is connected to the corresponding sound emitting channel of the transducer one by one through the first switch, and the LCR parameters of the multiple sound emitting channels of the transducer are tested one by one, or the detection input of the LCR tester is connected to all the sound emitting channels of the transducer through the first switch, and the LCR parameters of the multiple sound emitting channels of the transducer are tested; when testing the electrical parameters or the acoustic parameters, the output channel of the power amplifier board is connected to the corresponding sound emitting channel of the transducer one by one through the second switch, and the electrical parameters or the acoustic parameters of the multiple sound emitting channels of the transducer are tested one by one, or the output channel of the power amplifier board is connected to all the sound emitting channels of the transducer through the second switch, and the electrical parameters or the acoustic parameters of the multiple sound emitting channels of the transducer are tested.

[0018] In a preferred embodiment, the number of the sound emitting channels of the transducer, the output channels of the power amplifier board, the first switches and the second switches are the same, and each first switch is connected to one sound emitting channel, and each second switch is connected to one output channel of the power amplifier board and one sound emitting channel of the transducer.

[0019] In a preferred embodiment, the ground end of the LCR tester is connected to the first on-off circuit through a third switch, and / or the voltage probe is connected to the first on-off circuit through a fourth switch.

[0020] In a preferred embodiment, the first ground switch, the first switch, the second ground switch, the second switch, the third switch and the fourth switch are all relays.

[0021] In a preferred embodiment, the electrical parameters include voltage, current and power parameters, and the acoustic parameters include sound pressure, frequency response and distortion parameters.

[0022] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0023] The utility model discloses integrate multiple test modules (including LCR parameter test, electrical parameter test and acoustic parameter test) and automation technology, can be in one test equipment according to need comprehensive evaluation transducer's multiple performance indexes, realize test performance diversification, and significantly improve the test efficiency and precision, provide the data support of performance comprehensive evaluation for transducer's design and optimization. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure block diagram of the utility model one kind transducer's parameter test equipment;

[0025] Figure 2 It is the flow chart of the utility model parameter test;

[0026] Figure 3 It is a circuit connection schematic view of the parameter testing equipment of the transducer of the utility model.

[0027] Figure 4 It is a circuit connection schematic view of the utility model one concrete embodiment. CONCRETE EMBODIMENT

[0028] The concrete embodiment of the utility model is described in detail below, but it should be understood that the protection scope of the utility model is not limited by the concrete embodiment.

[0029] Unless otherwise explicitly indicated, in the whole specification and claims, the term "comprise" or its variants such as "include" or "comprising" and the like will be understood as including the stated element or component, and not excluding other elements or components.

[0030] Combination Figures 1-4 As shown in the figure, the utility model discloses a kind of parameter testing equipment of transducer, specifically including LCR tester, first on-off circuit, second on-off circuit, power amplifier board and oscilloscope or AP audio tester, wherein, LCR tester is connected with transducer by first on-off circuit, power amplifier board is connected with transducer by second on-off circuit, oscilloscope or AP audio tester is connected with power amplifier board, the testing equipment can be required to carry out LCR parameter test, electrical parameter test and acoustics parameter test to transducer respectively, for example, Figure 2 As shown in the figure.

[0031] Specifically, in implementation, the transducer to be measured can be piezoelectric transducer or electrostatic transducer, and the utility model does not make limitation to this. In the embodiment, the transducer to be measured is electrostatic transducer, and specifically full transparent electrostatic transducer that can be used in display equipment and the like. As known, electrostatic transducer is a kind of sensor made by using electrostatic induction principle, it is composed of two electrodes, one electrode is fixed on object, and the other electrode is movable. When voltage is applied between two electrodes, electric field will be generated between them, so that movable electrode generates electrostatic induction force, thereby generating displacement or vibration. In addition, according to needs, transducer can have one or more sound emission channels. In the embodiment, transducer has multiple sound emission channels, specifically 8 sound emission channels, and the signal output by each sound emission channel can be same or different, preferably same. For the convenience of description, the access end of 8 sound emission channels (i.e. the positive electrode of transducer) is respectively TP-1~TP-8, as shown in the figure. Figure 4

[0032] ​The LCR tester is connected to the transducer via a first on / off circuit, which controls the connection or disconnection between the LCR tester and the transducer. Specifically, the first on / off circuit includes a first grounding switch and at least one first switch, wherein the grounding terminal of the LCR tester is connected to the first grounding switch (i.e., Figure 4 The S19-GND2 marking shown is related to the negative terminal of the transducer (i.e., Figure 4 Connect the TP-9-CGND marking shown in the diagram to the detection input terminal of the LCR tester (i.e., Figure 4 The S terminal shown is connected to the corresponding sound-emitting channel of the transducer via a first switch. Additionally, in this embodiment, a third switch S10 connects the detection input terminal S of the LCR tester to the first on / off circuit. The on / off state of this third switch S10 controls the on / off state of the LCR tester. Similar to the number of sound-emitting channels of the transducer described above, the number of first switches in this embodiment is also set to eight, labeled S11 to S18. Each first switch is connected to one sound-emitting channel; that is, switches S11 to S18 are connected to the access terminals TP-1 to TP-8 of the sound-emitting channel, respectively. For example, switch S11 controls the on / off state of the LCR tester and the access terminal TP-1 of the sound-emitting channel, and so on.

[0033] The power amplifier board is connected to the transducer via a second switching circuit, which controls the connection or disconnection between the power amplifier board and the transducer. Specifically, the power amplifier board includes one or more output channels, and the second switching circuit includes a second grounding switch and at least one second switch, wherein the grounding terminal of the power amplifier board (i.e., Figure 4 The GND1 symbol shown is connected to the first grounding switch (i.e., Figure 4 The S9-GND1 marking shown is related to the negative terminal of the transducer (i.e., Figure 4 The amplifier board's output channels are connected to the corresponding sound channels of the transducers via the second switch (as shown in the TP-9-CGND marking). Similar to the transducer's sound channels, in this embodiment, the amplifier board has 8 output channels, labeled TP-A1 to TP-A8. The second switches also have 8 corresponding switches, labeled S1 to S1. Each second switch is connected to one output channel of the amplifier board and one sound channel of the transducer. Specifically, switches S1 to S8 are connected to the sound channel's input terminals TP-1 to TP-8 and the amplifier board's output channels TP-A1 to TP-A8, respectively. For example, switch S1 controls the connection between the amplifier board's output channel TP-A1 and the sound channel's input terminal TP-1, and so on.

[0034] The power amplifier board is connected with an oscilloscope or an AP audio tester. When connected with the oscilloscope, the oscilloscope is connected with the power amplifier board through a current probe and connected with the power amplifier board through a voltage probe. In this embodiment, the oscilloscope is connected with the power amplifier board through the current probe, and the current probe is connected with the power amplifier board through the second on-off circuit, specifically connected between the second grounding switch S9-GND1 and the negative electrode TP-9-CGND of the transducer; the oscilloscope is connected with the power amplifier board through the voltage probe, and the voltage probe is connected with the power amplifier board through the first on-off circuit, and the voltage probe is specifically connected with each switch in the first on-off circuit through a fourth switch S20. Of course, the current probe and the voltage probe are not limited to this position in the utility model, as long as the voltage and current of the transducer can be measured. In other alternative embodiments, the second on-off circuit can also be arranged between the power amplifier board and the oscilloscope or the AP audio tester, and the utility model is not limited to this.

[0035] In implementation, the first grounding switch S19-GND2, the first switches S11-S18, the second grounding switch S9-GND1, the second switches S1-S8, the third switch S10 and the fourth switch S20 can all be relays. In addition, the LCR parameters refer to the measurement parameters of inductance L, capacitance C and resistance R, the electrical parameters include voltage, current and power parameters, and the acoustic parameters include sound pressure, frequency response and distortion parameters.

[0036] The parameter testing equipment can respectively perform LCR parameter testing, electrical parameter testing and acoustic parameter testing on the transducer. When testing the LCR parameter, the LCR tester and the transducer are connected through the first on-off circuit, and meanwhile the connection between the oscilloscope or the AP audio tester and the transducer is disconnected through the second on-off circuit. When testing, the sound emitting channels of the transducer can be tested one by one, or all the channels of the transducer can be tested simultaneously. When testing one by one, the detection input end of the LCR tester is connected to the corresponding sound emitting channels of the transducer one by one through the first switch, and the LCR parameter of the sound emitting channels of the transducer is tested one by one. In the embodiment, the first grounding switch S19-GND2 and the third switch S10 are closed, and the switches S11-S18 are closed one by one. When the LCR parameter of the sound emitting channel 1 of the transducer is tested, the first grounding switch S19-GND2, the third switch S10 and the switch S11 are closed, and the same applies to the rest. When all the channels of the transducer are tested simultaneously, the detection input end of the LCR tester is connected to all the sound emitting channels of the transducer through the first switch, and the LCR parameter of the multiple sound emitting channels of the transducer is tested. In the embodiment, the first grounding switch S19-GND2, the third switch S10 and the switches S11-S18 are closed. In addition, when the transducer is a full-transparent electrostatic ultrasonic transducer, a direct-current high-voltage power supply with a voltage greater than or equal to 300V is connected to the transducer when the LCR parameter of the transducer is tested, so that the LCR parameter of the transducer is tested in a stable state, and the accuracy of the test is improved.

[0037] When testing the electrical parameter or the acoustic parameter, the connection between the LCR tester and the transducer is disconnected through the first on-off circuit, and the connection between the oscilloscope or the AP audio tester and the transducer is connected through the second on-off circuit. Similarly, when testing, the sound emission channels of the transducer can also be tested one by one, or all the sound emission channels of the transducer can be tested simultaneously. When testing one by one, the output channels of the power amplifier board are connected to the corresponding sound emission channels of the transducer one by one through the second switch, and the electrical parameter or the acoustic parameter of the multiple sound emission channels of the transducer is tested one by one. In the embodiment, the second ground switch S9-GND1 and the fourth switch S20 are closed, the first ground switch S19-GND2 and the third switch S10 are disconnected, and the switches S11-S18 and the corresponding switches S1-S8 are closed one by one. When the electrical parameter or the acoustic parameter of the sound emission channel 1 of the transducer is tested, the fourth switch S20, the switch S11, the second ground switch S9-GND1 and the switch S1 are closed, and the remaining switches are disconnected, and the like. When all the sound emission channels of the transducer are tested simultaneously, the output channels of the power amplifier board are connected to all the sound emission channels of the transducer through the second switch, and the electrical parameter or the acoustic parameter of the multiple sound emission channels of the transducer is tested. In the embodiment, the fourth switch S20, the switches S11-S18, the second ground switch S9-GND1 and the switches S1-S8 are closed, and the remaining switches are disconnected.

[0038] The utility model discloses the advantages lie in, the utility model discloses an integrated multiple test module (including LCR parameter test, electrical parameter test and acoustic parameter test) in one and automation technology can be needed in one test equipment according to overall evaluation multiple performance indexes of transducer, realize test performance diversification, and significantly improve test efficiency and precision, provide the data support of performance comprehensive evaluation for transducer's design and optimization.

[0039] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of explanation and illustration. These descriptions are not intended to limit the utility model to the precise forms disclosed, and as such, many modifications and variations are possible in light of the above teachings. The specific exemplary embodiments were chosen and described in order to explain the principles of the utility model and its practical application, to thereby enable others skilled in the art to best utilize the utility model, as well as various alternate and equivalent implementations with various modifications and changes obvious to those skilled in the art upon reading this description. The scope of the utility model is defined by the following claims and their equivalents.

Claims

1. A parametric test apparatus for a transducer, characterized by, The device comprises: LCR tester; First on-off circuit, through which the LCR tester is connected with the transducer; Second on-off circuit; Power amplifier board, through which the power amplifier board is connected with the transducer; Oscilloscope or AP audio tester, which is connected with the power amplifier board; When testing LCR parameters, the LCR tester and the transducer are connected through the first on-off circuit, while the connection between the oscilloscope or AP audio tester and the transducer is disconnected through the second on-off circuit; when testing electrical parameters, the connection between the LCR tester and the transducer is disconnected through the first on-off circuit, while the connection between the oscilloscope and the transducer is connected through the second on-off circuit; when testing acoustic parameters, the connection between the LCR tester and the transducer is disconnected through the first on-off circuit, while the connection between the AP audio tester and the transducer is connected through the second on-off circuit.

2. A transducer parameter testing apparatus as claimed in claim 1, wherein, The transducer is an ultrasonic transducer, and / or the transducer is an electrostatic ultrasonic transducer, and / or the transducer is a full-transparent electrostatic ultrasonic transducer.

3. A transducer parameter testing apparatus as claimed in claim 1, wherein, The transducer is a full-transparent electrostatic ultrasonic transducer, and when testing LCR parameters, a DC high-voltage power supply with a voltage greater than or equal to 300V is connected to the transducer.

4. A transducer parameter testing apparatus as claimed in claim 1, wherein, The oscilloscope is connected with the power amplifier board through a current probe and a voltage probe, and / or the oscilloscope is connected with the power amplifier board through a current probe, and the current probe is connected with the power amplifier board through the second on-off circuit; the oscilloscope is connected with the power amplifier board through a voltage probe, and the voltage probe is connected with the power amplifier board through the first on-off circuit.

5. A transducer parameter testing apparatus as claimed in claim 4, wherein, The transducer comprises one or more sound-emitting channels, the power amplifier board comprises one or more output channels, the first on-off circuit comprises a first grounding switch and at least one first switch, the grounding end of the LCR tester is connected with the negative electrode of the transducer through the first grounding switch, and the detection input end of the LCR tester is connected with the corresponding sound-emitting channel of the transducer through the first switch; the second on-off circuit comprises a second grounding switch and at least one second switch, the grounding end of the power amplifier board is connected with the negative electrode of the transducer through the second grounding switch, and the output channel of the power amplifier board is connected with the corresponding sound-emitting channel of the transducer through the second switch.

6. A transducer parameter testing apparatus as claimed in claim 5, wherein, When testing the LCR parameters, the detection input end of the LCR tester is connected to the corresponding sound emitting channel of the transducer through the first switch one by one, and the LCR parameters of the multiple sound emitting channels of the transducer are tested one by one, or the detection input end of the LCR tester is connected to all the sound emitting channels of the transducer through the first switch, and the LCR parameters of the multiple sound emitting channels of the transducer are tested; when testing the electrical parameters or the acoustic parameters, the output channel of the power amplifier board is connected to the corresponding sound emitting channel of the transducer through the second switch one by one, and the electrical parameters or the acoustic parameters of the multiple sound emitting channels of the transducer are tested one by one, or the output channel of the power amplifier board is connected to all the sound emitting channels of the transducer through the second switch, and the electrical parameters or the acoustic parameters of the multiple sound emitting channels of the transducer are tested.

7. A transducer parameter testing apparatus as claimed in claim 5, wherein, The number of the sound emitting channels of the transducer, the output channels of the power amplifier board, the first switches and the second switches are the same, each first switch is connected to one sound emitting channel, and each second switch is connected to one output channel of the power amplifier board and one sound emitting channel of the transducer.

8. A transducer parameter testing apparatus as claimed in claim 5, wherein, The ground end of the LCR tester is connected to the first on-off circuit through a third switch, and / or the voltage probe is connected to the first on-off circuit through a fourth switch.

9. A transducer parameter testing apparatus as claimed in claim 8, wherein, The first ground switch, the first switch, the second ground switch, the second switch, the third switch and the fourth switch are all relays.

10. A transducer parameter testing apparatus as claimed in claim 1, wherein, The electrical parameters include voltage, current and power parameters, and the acoustic parameters include sound pressure, frequency response and distortion parameters.

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