CN105716517A - Foil gauge fault detection apparatus - Google Patents
Foil gauge fault detection apparatus Download PDFInfo
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- CN105716517A CN105716517A CN201410738120.1A CN201410738120A CN105716517A CN 105716517 A CN105716517 A CN 105716517A CN 201410738120 A CN201410738120 A CN 201410738120A CN 105716517 A CN105716517 A CN 105716517A
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Abstract
The invention provides a foil gauge fault detection apparatus. The foil gauge fault detection apparatus includes a singlechip, a decoder, an optocoupler, a relay, an operational amplifier, and an A/D chip, wherein the singlechip is used for outputting a control digital signal to the decoder and receiving a data feedback signal of the A/D chip; the decoder is connected with the singlechip, and is used for decoding the received control digital signal output from the singlechip, and outputting mutually exclusive low effective output signals; the optocoupler is connected with the output end of the decoder, and is used for performing harmonic wave isolation on the mutually exclusive low effective output signals and outputting a relay driving signal; the relay is connected with the output end of the optocoupler, and is used for receiving the relay driving signal to perform coil pick-up to switch on a cable, so that the relay can generate a bridge arm imbalance signal; the operational amplifier is connected with the output end of the relay, and is used for amplifying the bridge arm imbalance signal and then transmitting the bridge arm imbalance signal to the A/D chip; and the A/D chip is connected with the output end of the operational amplifier, and is used for receiving the amplified bridge arm imbalance signal to perform A/D analog-to-digital conversion.
Description
Technical field
The present invention relates to a kind of foil gauge failure detector, be mainly used in aircraft structure test and fast and accurately foil gauge and measurement circuitry detected.
Background technology
At present, foil gauge and measurement circuitry detection mode mainly adopt circuit tester detection and collecting device detection two ways.Generally, testing in set-up procedure at aircraft structure strength, the foil gauge after having pasted adopts circuit tester that foil gauge is detected；After being connected to measurement cable, by collecting device, whole strain measurement circuit is detected.But, along with aircraft structure test measures the increase of scale, adopt traditional detection mode to there is some problem following:
A) foil gauge measurement scale has reached several ten thousand, and foil gauge is accomplished to access collecting device from stickup, need through repeatedly wiring process, and whole measurement circuitry does not generally wait (determining according to measurement point position and collecting device position) from tens meters to rice up to a hundred.Intermediate connection process is likely to occur the various problems such as short circuit, open circuit, and the process of problem is chronic.
B) strain measurement completed for wiring, except adopting circuit tester detection after having pasted first, was all start after being connected to collecting device, and configuring substantial amounts of file in the past.And for the maintenance of in-problem strain gauge and circuit, all carry out when test is about to and starts.Therefore substantial amounts of maintenance work can take test time, affects test progress；And the maintenance load of strain gauge and circuit is big, process is complicated, can take too much human and material resources, and can not carry out concurrent working.
If c) by detection work in advance, detect before accessing collecting device, namely after measurement line wiring completes, before accessing collecting device, detect measuring cable.But, what foil gauge measurement cable adopted is 50 core cables, and accessible 16 road foil gauges, according to the artificial method using circuit tester to detect, exist process many, and anthropic factor is many, and workload is big, inefficient problem.
Due to above reason, it is necessary to research and development one is easy to carry, simple to operate, detection speed is fast, and can once differentiate the strain failure detecting device measuring cable (16 road foil gauge).
Summary of the invention
(1) goal of the invention
It is an object of the invention to provide a kind of foil gauge failure detector.This device can after strain measurement cable welding completes, the foil gauge resistance of one-time detection 16 tunnel (1 cable), forms concurrent operating modes, improves work efficiency.
(2) inventive technique solution
The invention provides a kind of foil gauge failure detector, it is characterised in that including:
Single-chip microcomputer, for controlling digital signal to decoder output and receiving the data feedback signal of A/D chip；
Decoder, is connected with single-chip microcomputer, for being decoded by the control digital signal that the single-chip microcomputer received exports, and exports low effective output signal of mutual exclusion；
Optocoupler, is connected with decoder output, and the low effective output signal for connecing mutual exclusion carries out harmonic wave isolation, and output relay drives signal；
Relay, is connected with optocoupler outfan, drives signal to carry out coil adhesive for receiving relay, makes cable connect, and relay produces brachium pontis unbalanced signal；
Operational amplifier, is connected with relay output end, for being amplified by brachium pontis unbalanced signal, is then transferred to A/D chip；
A/D chip, is connected with operational amplifier output terminal, and the brachium pontis unbalanced signal for receiving amplification carries out A/D analog digital conversion, is exported by data feedback signal and processes to single-chip microcomputer, processes and draws measurement result.
Further, also including touching display screen, the data feedback signal that collection processes is sent to display screen and shows by single-chip microcomputer, touches display screen and transfers signals to single-chip microcomputer, and the signal again processed is returned to display screen and displays by single-chip microcomputer again.
This detecting device has the advantage that
● by single-chip microcomputer, without collecting device, can independent detection measurement circuitry fault；
● owing to all by electronic devices and components and chip technology, avoiding artificial disturbance operation greatly, certainty of measurement is high, and efficiency is high；
● adopting liquid crystal display screen to touch display measured value, human-computer interaction interface is friendly；
● it is easy to produce, cheap for manufacturing cost.
Accompanying drawing illustrates:
Fig. 1 is connection diagram of the present invention；
Fig. 2 is 50 core jack connector figure；
Fig. 3 is software flow pattern in single-chip microcomputer.
Detailed description of the invention
The invention provides a kind of foil gauge failure detector, it is characterised in that including:
Single-chip microcomputer 1, for controlling digital signal to decoder output and receiving the data feedback signal of A/D chip；
Decoder 2, is connected with single-chip microcomputer, for being decoded by the control digital signal that the single-chip microcomputer received exports, and exports low effective output signal of mutual exclusion；
Optocoupler 3, is connected with decoder output, and the low effective output signal for connecing mutual exclusion carries out harmonic wave isolation, and output relay drives signal；
Relay 4, is connected with optocoupler outfan, drives signal to carry out coil adhesive for receiving relay, makes cable connect, and relay produces brachium pontis unbalanced signal；
Operational amplifier 5, drives relay output end to connect, for being amplified by brachium pontis unbalanced signal, is then transferred to A/D chip；
A/D chip 6, is connected with operational amplifier output terminal, and the brachium pontis unbalanced signal for receiving amplification carries out A/D analog digital conversion, is exported by data feedback signal and processes to single-chip microcomputer, processes and draws measurement result.
Including touching display screen 7, the data feedback signal that collection processes is sent to display screen and shows by single-chip microcomputer, touches display screen and transfers signals to single-chip microcomputer, and the signal again processed is returned to display screen and displays by single-chip microcomputer again.
Components and parts in the present invention preferentially adopt single-chip microcomputer (ATmega64-16), relay (TX2-5V), operational amplifier (LM324J), 5 modules such as A/D chip (MAX1241), optocoupler (TLP521-4), decoder (74HC154) realize, specifically as shown in Figure 1.
System principle
Micro Controller Unit (MCU) driving relay process.
Single-chip microcomputer inputs and provides low effective output of 16 mutual exclusions by acceptable 4 the high effective binary addresses of 154 decoders, and effect is to extend single-chip processor i/o interface, drives No. 16 relays；Decoder and 44 light Rhizoma Nelumbinis connect, then connecting with relay coil drives the adhesive of relay to discharge, middle connection light Rhizoma Nelumbinis is in order to signal is isolated, in order to avoid relay coil produces high harmonic wave in course of action, rear end single-chip microcomputer decoder is caused damage, the effect of light Rhizoma Nelumbinis is by output after opto-electronic conversion by the signal of telecommunication of decoder, is specially the signal of telecommunication → optical signal → signal of telecommunication, and above signal is analogue signal transmission.
Transformation process between cable, relay node, amplifier, A/D, single-chip microcomputer.
It is that relay carries out action based on the first step, the a certain road signal of cable is connected, by the Wheatstone bridge principle in circuit, signal unbalanced on brachium pontis is carried out operation amplifier by operational amplifier, it is then transferred to A/D chip, give single-chip microcomputer by digital signal after carrying out A/D analog digital conversion to process, owing to there being host-host protocol to process here for two-way signaling between single-chip microcomputer and A/D.Above handling process is (resistance of cable change → change into analog electrical signal → A/D chip by Wheatstone bridge convert analog signals into digital signal)
Video data process, this equipment adopts and touches display screen, so man-machine interaction is processed by display screen, with man-machine interaction, so signal herein is two-way transmission signals, the signal of transmission is digital signal, specific works process is, the signal that collection processes is sent to display screen and shows by single-chip microcomputer, and touch key-press transfers signals to single-chip microcomputer by artificial touch, and the signal of process is returned to display screen and displays by single-chip microcomputer again.
Power pack, power supply is divided into DC90V, gives and measures the power supply that insulation resistance provides；The device that DC5V (1) is single-chip microcomputer and periphery is powered；DC5V (2) provides power supply for relay coil；DC2.5V provides reference power supply for A/D.
The resistance test of foil gauge is realized by electrical bridge principle.The process of implementing is in tested resistor loaded to circuit, will to convert, measuring resistance value, the difference of magnitude of voltage measuring bridge two ends to, uses difference channel to realize (+U in circuit0With-U0Difference), be then AD converted, R can be calculated by following formulaXValue:
Wherein, UeThe magnitude of voltage 5V, the R that load for electric bridge two ends are bridge resistance, U0For the difference of electric bridge both end voltage value, RXIt it is measured resistance.By ADG1206,16 road circuit are switched over, it is achieved 16 tunnel AD conversion.
(1) detection method
50 core jack connector are as it is shown in figure 1, short circuit between foil gauge 2,3, and what measure between 2,3 is conductor resistance.
Measure 1,2 respectively；1,3；2, the electrostrictive strain resistance between 3
1, between 2, resistance is within normal range, and liquid crystal display screen shows normally, otherwise display is abnormal；
1, between 3, resistance is within normal range, and liquid crystal display screen shows normally, otherwise display is abnormal；
2, between 3, resistance is close to 0 Ω, and liquid crystal display screen shows normally, otherwise display is abnormal.
(2) software flow
Foil gauge failure detector reaches the judgement of above strain measurement mainly through single-chip microcomputer carries out software programming, and flow process is shown in Fig. 3.
(3) technical identification test
Test objective: verify the accuracy of this detector effectiveness to strain measurement circuitry fault detection and foil gauge resistivity measurements.
Process of the test: randomly choose the measurement cable connecting foil gauge in a test, this cable is with showing foil gauge fault, the foil gauge resistance value that record records when gathering cabinet detection.Use strain failure detector that failure cable is detected, testing result and above-mentioned testing result are contrasted.
Result of the test: fault detection checking result of the test is as shown in table 1, fault detection checking result of the test (normal: √, fault: ×), resistance measurement result is as shown in table 2.Being can be seen that this small-sized strain failure detector is to the detection of foil gauge fault accurately by test data, foil gauge resistance value is basically identical with collection cabinet measured value.This detector disclosure satisfy that the requirement in test set-up procedure to strain measurement.
Table 1
| Channel number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Gather cabinet | × | √ | √ | √ | √ | × | √ | √ | × | √ | √ | × | √ | √ | √ | √ |
| Strain failure detector | × | √ | √ | √ | √ | × | √ | √ | × | √ | √ | × | √ | √ | √ | √ |
Table 2
Claims (2)
1. a foil gauge failure detector, it is characterised in that including:
Single-chip microcomputer, for controlling digital signal to decoder output and receiving the data feedback signal of A/D chip；
Decoder, is connected with single-chip microcomputer, for being decoded by the control digital signal that the single-chip microcomputer received exports, and exports low effective output signal of mutual exclusion；
Optocoupler, is connected with decoder output, and the low effective output signal for connecing mutual exclusion carries out harmonic wave isolation, and output relay drives signal；
Relay, is connected with optocoupler outfan, drives signal to carry out coil adhesive for receiving relay, makes cable connect, and relay produces brachium pontis unbalanced signal；
Operational amplifier, is connected with relay output end, for being amplified by brachium pontis unbalanced signal, is then transferred to A/D chip；
A/D chip, is connected with operational amplifier output terminal, and the brachium pontis unbalanced signal for receiving amplification carries out A/D analog digital conversion, is exported by data feedback signal and processes to single-chip microcomputer, processes and draws measurement result.
2. foil gauge failure detector according to claim 1, it is characterized in that, also include touching display screen, it is connected with single-chip microcomputer outfan, the data feedback signal that collection processes is sent to display screen and shows by single-chip microcomputer, touching display screen and transfer signals to single-chip microcomputer, the signal again processed is returned to display screen and displays by single-chip microcomputer again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410738120.1A CN105716517A (en) | 2014-12-05 | 2014-12-05 | Foil gauge fault detection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410738120.1A CN105716517A (en) | 2014-12-05 | 2014-12-05 | Foil gauge fault detection apparatus |
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| CN105716517A true CN105716517A (en) | 2016-06-29 |
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| CN201410738120.1A Pending CN105716517A (en) | 2014-12-05 | 2014-12-05 | Foil gauge fault detection apparatus |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1693838A (en) * | 2005-05-27 | 2005-11-09 | 南京航空航天大学 | Flexible strain signal spot colletion system |
| CN201000339Y (en) * | 2006-09-07 | 2008-01-02 | 张卫钢 | Vibratory string type sensor automatically distributing equipment |
| CN201897612U (en) * | 2010-12-08 | 2011-07-13 | 广东高新兴通信股份有限公司 | Device for measuring voltages of two battery packs |
-
2014
- 2014-12-05 CN CN201410738120.1A patent/CN105716517A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1693838A (en) * | 2005-05-27 | 2005-11-09 | 南京航空航天大学 | Flexible strain signal spot colletion system |
| CN201000339Y (en) * | 2006-09-07 | 2008-01-02 | 张卫钢 | Vibratory string type sensor automatically distributing equipment |
| CN201897612U (en) * | 2010-12-08 | 2011-07-13 | 广东高新兴通信股份有限公司 | Device for measuring voltages of two battery packs |
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Application publication date: 20160629 |