CN207424104U

CN207424104U - Vibration amplifier sensor capacitance amount detecting device

Info

Publication number: CN207424104U
Application number: CN201721628597.XU
Authority: CN
Inventors: 彭冬
Original assignee: CHENGDU FEIYA AIRBORNE EQUIPMENT APPLICATION RESEARCH Co Ltd
Current assignee: CHENGDU FEIYA AIRBORNE EQUIPMENT APPLICATION RESEARCH Co Ltd
Priority date: 2017-11-29
Filing date: 2017-11-29
Publication date: 2018-05-29
Anticipated expiration: 2027-11-29

Abstract

The utility model discloses a kind of vibration amplifier sensor capacitance amount detecting devices, and including signal generating circuit and signal deteching circuit, signal generating circuit output terminal is connected with signal deteching circuit input terminal, and signal deteching circuit includes slide rheostat R₃, capacitance C₃, ammeter A and diode U；Slide rheostat R₃One end and load resistance R₁Series connection, the other end are connected with the current input terminal of ammeter A；The current output terminal of ammeter A connect with diode U after by capacitance C₃It is connected with GND ground terminals；Measured capacitance C₂Capacitance C is connected in parallel on after series relay K₃Both ends.The utility model realizes that range conversion and measures conversion circuit on measurement table cooperation " working condition " band switch used can indicate " engine luggine acceleration value " and " capacitance value " by AC bridge.

Description

Vibration amplifier sensor capacitance amount detecting device

Technical field

The utility model is related to electronic technology fields, detect and fill more particularly to a kind of vibration amplifier sensor capacitance It puts.

Background technology

Capacitance measuring technique has remarkable progress in recent years, it is not only widely used in displacement, vibration, angle, angular speed etc. Mechanical quantity, but also progressively expand the measurement applied to pressure, differential pressure, liquid level, component content etc..Method is predominantly with each Non electrical quantity, using the principle of capacitor, is converted to capacitance, and then realizes non-electrical by the capacitor of type as sensing element The conversion of electricity is measured, so as to be used for detecting the non-electric parameter such as pressure, power, displacement, liquid level, thickness and vibration.

Since bridge output voltage is directly proportional to supply voltage, therefore it is required that mains fluctuations are minimum, it is necessary to using steady Frequently, measures such as fixed ampllitude, therefore in practical applications, it is very high to be connected to the AC bridge output impedance of capacitance sensor, output voltage Amplitude is again small, it is therefore necessary to be followed by measure after high input impedance amplifier amplifies signal.In-site measurement capacitor need to be torn open Except connecting line, not only heavy workload but also fragile capacitor；Capacitance meter output voltage is low and causes failure recall rate low.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of vibration amplifier sensor capacitance Detection device.

The purpose of this utility model is achieved through the following technical solutions：Vibration amplifier sensor capacitance detects Device, including signal generating circuit and signal deteching circuit, signal generating circuit output terminal and signal deteching circuit input terminal phase Even, signal deteching circuit includes slide rheostat R₃, capacitance C₃, ammeter A and diode U；Slide rheostat R₃One end with Load resistance R₁Series connection, the other end are connected with the current input terminal of ammeter A；The current output terminal of ammeter A is gone here and there with diode U Pass through capacitance C after connection₃It is connected with GND ground terminals；Measured capacitance C₂Capacitance C is connected in parallel on after series relay K₃Both ends.

The cathode of the diode U also with load resistance R₂One end be connected, load resistance R₂The other end be connected to signal Generation circuit output end and load resistance R₁Points of common connection on.

Decoupling capacitance C is also parallel between the current input terminal of the ammeter A and GND ground terminals₁, decoupling capacitance C₁Energy The influence of parasitic capacitance is enough eliminated, prevents the interference of external electric field and external magnetic field.

The beneficial effects of the utility model are：

1）Vibration amplifier exerciser need to send using engine vibration sensor on dedicated network analyzer with The signals such as the proportional voltage signal of vibration acceleration, vibration acceleration signal and alarm, to meet the function of vibration amplifier Test and troubleshooting inspection.It requires amplitude continuous between 40~240mV by simulating XX-03-01 type sensor signals Conversion, the sensor for substituting various sensitivity is can guarantee with this sensor capacitance amount detecting device, easy to use.

2）Ingenious use decoupling capacitance is connected with ground terminal, eliminates the influence of parasitic capacitance, prevents external electric field and external magnetic field Interference.

3）Using relay, with low current control high current is gone to operate, play in circuit automatic adjustment, safeguard protection, The effects that conversion circuit.

4）The bridge circuit principle used makes in-site measurement capacitor reduce workload without connecting line and be hardly damaged Capacitor.

5）Diode is connected with measurement table, one-way conduction electric current ends reverse current, effectively protects circuit.And two pole The detection rectified action of pipe, can obtain direct-flow output signal.

Description of the drawings

Fig. 1 is the utility model measuring circuit isoboles.

Specific embodiment

The technical solution of the utility model, but the scope of protection of the utility model are described in further detail below in conjunction with the accompanying drawings It is not limited to as described below.

As shown in Figure 1, vibration amplifier sensor capacitance amount detecting device, including signal generating circuit and signal detection electricity Road, signal generating circuit output terminal are connected with signal deteching circuit input terminal, and signal deteching circuit includes slide rheostat R₃, electricity Hold C₃, ammeter A and diode U.

Slide rheostat R₃One end and load resistance R₁Series connection, the other end are connected with the current input terminal of ammeter A.It is sliding Dynamic rheostat R₃Bridge balance is adjusted by changing itself resistance value.

The current output terminal of ammeter A connect with diode U after by capacitance C₃It is connected with GND ground terminals；The electric current The current output terminal of Table A is connected with the anode of diode U, diode U controllable currents direction, after capacitance charging complete, is cut Only reverse current is so as to protecting circuit.Ammeter A passes through capacitance C₃It is connected with GND ground terminals, ammeter A measurement capacitances C₃Both ends Current value.

Measured capacitance C₂Capacitance C is connected in parallel on after series relay K₃Both ends, relay K is in the capacitance C of charging complete₂Output When the variation of energizing quantity reaches regulation requirement, capacitance C is made in output circuit₂With capacitance C₃Predetermined rank occurs for circuit in parallel Transition.

The cathode of the diode U also with load resistance R₂One end be connected, load resistance R₂The other end be connected to signal Generation circuit output end and load resistance R₁Points of common connection on.Resistance R₂With resistance R₁It is current-limiting resistance, rises in circuit The extra electricity generated into the absorption course of work prevents capacitance from crossing cause thermal damage in charge and discharge process or unidirectionally being charged.

Decoupling capacitance C is also parallel between the current input terminal of the ammeter A and GND ground terminals₁, can be in charging process In, the influence of parasitic capacitance is eliminated, prevents the interference of external electric field and external magnetic field.

When " working condition " switch is located at " sensor capacitance inspection " position, ammeter A and signal generating circuit are produced Raw square-wave signal while incoming transport electric bridge, wherein 16~22Vpp of the 30KHz square waves exported are powered for AC bridge.It is logical Cross the upper sensor capacitance C of pressing " exerciser "₂Button can make exerciser export DC voltage to the relay K lines in adaptation Circle power supply, by sensor capacitance C₂Circuit disconnects.Then slide rheostat R is utilized₃Zeroing act on by electric bridge balancing, at this point, Ammeter A is between cornerwise isopotential point, then is flowed through inside it almost without electric current.Then again again by sensor capacitance C₂And the capacitance C into electric bridge₃On the support arm at place, sensor capacitance C₂With capacitance C₃After parallel connection, new capacitance is capacitance C₃Value With capacitance C₂The sum of value, the change of capacitance cause bridge balancing state to be destroyed, just have electric current output on the diagonal, through two After pole pipe detection, direct-flow output signal can be obtained, so that ammeter A throws of pointer.Come finally by the variation of current value The variation of capacitance is obtained, you can reach measurement purpose.

The above is only the preferred embodiment of the utility model, it should be understood that the utility model is not limited to herein Disclosed form is not to be taken as the exclusion to other embodiment, and available for various other combinations, modification and environment, and It can be modified in contemplated scope described herein by the technology or knowledge of above-mentioned introduction or association area.And this field The modifications and changes that personnel are carried out do not depart from the spirit and scope of the utility model, then all should be in right appended by the utility model It is required that protection domain in.

Claims

1. vibration amplifier sensor capacitance amount detecting device, including signal generating circuit and signal deteching circuit, signal occurs Circuit output end is connected with signal deteching circuit input terminal, it is characterised in that：Signal deteching circuit includes slide rheostat R₃, electricity Hold C₃, ammeter A and diode U；Slide rheostat R₃One end and load resistance R₁Series connection, the electricity of the other end and ammeter A Stream input terminal is connected；The current output terminal of ammeter A connect with diode U after by capacitance C₃It is connected with GND ground terminals；It is tested Capacitance C₂Capacitance C is connected in parallel on after series relay K₃Both ends.

2. vibration amplifier sensor capacitance amount detecting device according to claim 1, it is characterised in that：The diode The cathode of U also with load resistance R₂One end be connected, load resistance R₂The other end be connected to signal generating circuit output terminal with it is negative Carry resistance R₁Points of common connection on.

3. vibration amplifier sensor capacitance amount detecting device according to claim 1, it is characterised in that：The ammeter Decoupling capacitance C is also parallel between the current input terminal of A and GND ground terminals₁。