CN205209427U - Wireless accurate strain measuring device - Google Patents

Wireless accurate strain measuring device Download PDF

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Publication number
CN205209427U
CN205209427U CN201520915372.7U CN201520915372U CN205209427U CN 205209427 U CN205209427 U CN 205209427U CN 201520915372 U CN201520915372 U CN 201520915372U CN 205209427 U CN205209427 U CN 205209427U
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China
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accurate
circuit
voltage
module
strain
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CN201520915372.7U
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Chinese (zh)
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李昌
周松斌
刘伟鑫
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Guangdong Institute of Intelligent Manufacturing
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Guangdong Institute of Automation
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Abstract

The utility model relates to a wireless accurate strain measuring device is including quick -witted case, locate the control panel on the quick -witted case and locate measured module, the wiFi module of quick -witted incasement portion, control panel is used for realizing human -computer interaction, measured module includes digital control module and accurate power module, accurate power module is including constant temperature reference source, accurate adjustable voltage source, accurate voltage measurement circuit, strain bridge drive circuit and strain bridge measuring circuit, the digital control module includes treater, debugging interface, serial ports, wiFi module interface. Realize a high accuracy voltmeter input, the output of calbiration system simultaneously, the quantity of instrument is calibrated in reducible use, improves the calibration speed.

Description

A kind of wireless accurate strain gauge means
Technical field
Basis is practical newly relates to strain gauge means field, in particular, relates to a kind of wireless accurate strain gauge means.
Background technology
Strain measurement technique is widely used, the great manufacturing equipment of the mechanical engineering by dead load effect, high ferro automobile, steamer, nuclear power, civil construction, hydraulic engineering, bridge, road contain tunnel engineering and metallurgy, oil, chemical field great, important key member all need to use strain gauge means.Great to these, important key member is tested, and needs to use wireless accurate strain gauge means during checking.Remote-operated strain gauge means can in order to online, the remote monitoring of equipment simultaneously.
A key technical index of strain gauge means is measuring accuracy.Affect precision because have: the pressure drop of electric current and noise on the degree of stability of measurement mechanism reference source, energisation mode, ground wire.At present, the precision of strain gauge means can also improve further; And it is adjustable to realize driving voltage; Sensor parameters can set; Carry out the functions such as operated from a distance.The realization of these functions will increase the value of strain gauge means greatly.
From in the market, also do not have a kind of can realize high precision, Parameter adjustable, can the strain gauge means of wireless remote operation.
Utility model content
In view of this, be necessary for above-mentioned problem, a kind of wireless accurate strain gauge means be provided, realize high precision, Parameter adjustable, can wireless remote operation.
To achieve these goals, this practical new technical scheme is as follows:
A kind of wireless accurate strain gauge means, comprises cabinet, is located at the control panel on cabinet and is located at measurement module, the WiFi module of cabinet inside;
Described control panel is used for realizing man-machine interaction;
Described measurement module comprises digital control module and precision voltage source module; Described precision voltage source module comprises constant temperature reference source, accurate variable voltage source, accurate voltage metering circuit, strain bridge driving circuit and strain bridge metering circuit; Described digital control module comprises processor, debugging interface, serial ports, WiFi module interface.
Described constant temperature reference source connects accurate variable voltage source and accurate voltage metering circuit respectively, and described accurate variable voltage source connects strain bridge driving circuit, and described strain bridge driving circuit connects strain bridge metering circuit; Described WiFi module interface connects WiFi module
As preferably, the power supply of described digital control module and precision voltage source module is mutually isolated, and ground wire is mutually isolated, does not place other elements around constant temperature reference source; Constant temperature reference source and aerial lug concentrate on two paths; The hollow out process of non-wiring area.
As preferably, described strain bridge metering circuit at least comprises a false zero circuit, for eliminating the error that Earth noise and vagabond current pressure drop produce;
As preferably, described strain bridge driving circuit comprises voltage reversing circuit, the output terminal of described voltage reversing circuit input termination precision voltage source module; Voltage reversing circuit output terminal as strain bridge driving voltage negative pole, thus creates the excitation power supply of Symmetrical; Described voltage reversing circuit comprises amplifier reverser and PNP triode, described amplifier reverser and PNP triode form and oppositely expand current circuit, described PNP triode base stage and amplifier inverter output are connected to back biased diode, be connected with resistance between PNP triode base stage with amplifier inverter output, be connected with resistance between PNP triode with power cathode.
As preferably, described false zero circuit comprises a pair each other to the push-pull configuration that the triode of pipe forms, described push-pull configuration and an accurate amplifier form a follower, the input end of described push-pull configuration connects positive-negative power by resistance, the zero reference point of the input termination reference source of described follower, the output terminal of follower exports as false zero, and false zero exports and connects with the resistance of (10-100 ohm) between the ground wire of precision voltage source module.
Compared with prior art, this practical new beneficial effect is:
1, false zero circuit is adopted to produce the Zero potential reference of system, and multiple false zero circuit can be used, produce multiple Zero potential reference, the impact that the noise eliminating power supply ground brings, also can eliminate back the impact that vagabond current produces pressure drop, most of parasitic heat galvanic couple can also be eliminated and produce voltage to the impact of precision voltage source.
2, do not place other elements near constant temperature reference source, circuit adopts broken line to draw, and in constant temperature reference source region, the hollow out process of non-wiring area, increases thermal resistance, improve the stability of constant temperature reference source.
3, voltage reversing circuit is adopted to produce negative energize voltage, strain bridge road adopts the excitation of Symmetrical power supply can realize the output voltage on bridge road at zero crossings, be conducive to the design of bridge road output amplifier, when accurate voltage measurement ADC input range is little, use this programme still can to encourage by high voltage.The driving voltage of sensor input is larger, and the sensitivity of sensor is higher.
4, the sensor parameters of this measurement mechanism can be adjusted, and driving voltage is adjustable, can coordinate the sensor of different parameters; This device with accurate adjustable voltage output function, accurate voltage measurement function.
5, this device realizes the input of calibration system simultaneously of high-accuracy voltage table, output, and the quantity of calibration instrument capable of reducing using, improves calibration speed.
6, this device is by WiFi wave point connecting Internet, and long-range PC can control this measurement mechanism by the Server remote on internet, achieves remote monitoring.
Accompanying drawing explanation
Fig. 1 shows this practical wireless accurate strain detection testing device panel newly;
Fig. 2 shows the structured flowchart of this practical new precision measurement module;
Fig. 3 shows the false zero circuit of strain bridge metering circuit;
Fig. 4 shows polarity of voltage circuit for reversing;
Fig. 5 shows wireless accurate strain gauge means calibration connected mode;
Fig. 6 shows accurate strain measurement touch screen interface.
Embodiment
Below in conjunction with drawings and Examples, this practical new described wireless accurate strain gauge means is described further.
Be below the preferred example of this practical new described a kind of wireless accurate strain gauge means, therefore do not limit this practical new protection domain.
A kind of wireless accurate strain gauge means, comprises cabinet, is located at the control panel on cabinet and is located at measurement module, the WiFi module of cabinet inside; Described cabinet is made up of suitcase, and control panel lies in suitcase, under measurement module lies in panel, in suitcase; On panel, human-computer interaction interface as described in Figure 1, and Fig. 6 shows accurate strain measurement touch screen interface.Described constant temperature reference source connects accurate variable voltage source and accurate voltage metering circuit respectively, and described accurate variable voltage source connects strain bridge driving circuit, and described strain bridge driving circuit connects strain bridge metering circuit; Described WiFi module interface connects WiFi module
Described measurement module comprises digital control module and precision voltage source module, and digital control module and precision voltage source module are isolated by isolator; Described precision voltage source module comprises constant temperature reference source, accurate variable voltage source, accurate voltage metering circuit, strain bridge driving circuit and strain bridge metering circuit; Described digital control module comprises processor, debugging interface, serial ports, WiFi module interface.
In the present embodiment, that described accurate variable voltage source adopts is a slice 20 DAC, AD5791.This chip adopts positive and negative reference voltage.The output terminal of chip uses accurate adding circuit, achieves zero volt and exports to positive reference voltage.The reference zero access false zero reference point of this circuit accurate voltage, and do not connect power ground.With magnetic coupling transmission of signal between this chip and processor, realize electric isolution.
As preferably, described strain bridge metering circuit at least comprises a false zero circuit, for eliminating the error that Earth noise and vagabond current pressure drop produce;
As preferably, the power supply of described digital control module and precision voltage source module is mutually isolated, and ground wire is mutually isolated.
In the present embodiment, constant temperature reference source is made up of LTZ1000 constant temperature reference power supply chip and peripheral reference voltage generating circuit.Constant temperature reference source is placed on the wiring board of hollow out, which increases thermal resistance.Reference source and external circuit be routed to meander line structure, see Fig. 2.The benchmark no-voltage point of system adopts false zero circuit to produce, and is not reference voltage zero point with not adopting system power supply.Constant temperature reference source point of zero voltage separate cabling is to the input end of false zero circuit.
Described false zero circuit is see Fig. 3, and " Z-S_GND " is constant temperature reference source reference zero.The false zero reference point that " REF_GND " is system, the reference point relevant with accurate voltage all uses false zero reference point.Multiple false zero circuit can be used as required.Due to the self-regulation ability of this circuit, reflux when there being big current, temperature is floated, power supply can provide zero-potential point accurately time unstable, ensure that the precision of system.
As preferably, described strain bridge driving circuit comprises voltage reversing circuit, the output terminal of described voltage reversing circuit input termination precision voltage source module; Voltage reversing circuit output terminal as strain bridge driving voltage negative pole, thus creates the excitation power supply of Symmetrical; Described voltage reversing circuit comprises amplifier reverser and PNP triode, described amplifier reverser and PNP triode form and oppositely expand current circuit, described PNP triode base stage and amplifier inverter output are connected to back biased diode, be connected with resistance between PNP triode base stage with amplifier inverter output, be connected with resistance between PNP triode with power cathode.
This voltage reversing circuit is see Fig. 4, and this circuit can provide the voltage source excitation of Symmetrical to four arm strain bridges.The voltage of electric bridge exports all the time near no-voltage, is conducive to the design of measuring and amplifying circuit and sample circuit.Such as, when output voltage is 10V, bridge excitation can reach 20V.Now electric bridge exports still near zero volt, and the sample range of ADC is in 1V.If without symmetrical drive, during 10V driving voltage, electric bridge exports will near 5V, and the sample range of ADC is greater than 5V.The ADC of same figure place, range extension will reduce precision.So adopt this practical new symmetrical drive technology, driving voltage is doubled, and decreases output area, improve precision.
As preferably, described false zero circuit comprises a pair each other to the push-pull configuration that the triode of pipe forms, described push-pull configuration and an accurate amplifier form a follower, the input end of described push-pull configuration connects positive-negative power by resistance, the zero reference point of the input termination reference source of described follower, the output terminal of follower exports as false zero, and false zero exports and connects with the resistance of (10-100 ohm) between the ground wire of precision voltage source module.
A kind of wireless accurate strain measurement method, adopt above-mentioned wireless accurate strain gauge means, described measuring method comprises the following steps:
S1, system calibration;
S2, operated from a distance;
S3, accurate voltage export and measure;
S4, accurate strain testing.
As preferably, as shown in Figure 5, described step S1 specifically comprises: with the output port of accurate variable voltage source and the port of accurate voltage metering circuit of relay connected system, and connect external precision voltage table; Accurate variable voltage source exports uncorrected output voltage (Vo), and the measurement of accurate voltage metering circuit obtains magnitude of voltage (Vi), and the measurement of accurate voltage table obtains magnitude of voltage (Vm); (Vo, Vi, Vm) is one group of calibration value, sets different output voltages (Vo) and can obtain organizing calibration value more, forms a set { Vo n, Vi n, Vm n; This set is the calibration data of system, when exporting precision voltage source, by { Vo in set n, Vm nsubset carries out piecewise linear correction, when accurate voltage is measured, by { Vi in set n, Vm nsubset carries out piecewise linear correction.
As preferably, described step S2 specifically comprises: with a WiFi module on device, server on this module accessing Internet, same server logined by local computer, and by this server, local computer can setting sensor parameter, and be sent to strain gauge means, the magnitude of voltage that strain gauge means arrives according to the parameter of remote setting and local measurement, calculates strain value, and mails to local computer.
As preferably, described step S3 specifically comprises: setting output voltage and system calibration data obtain revised setting value, and setting value is write digital to analog converter; During voltage measurement, the data and system calibration data according to reading analog to digital converter obtains revised measured value; The digital signal processing means such as measuring process comprises on average, filtering.
As preferably, described step S4 specifically comprises: according to the sensitivity coefficient (K) of sensor, strain bridge road number (N), driving voltage (E), sensor output voltage (e), according to equation try to achieve the strain stress of sensor, in systems in which, parameter K, N, E can set, and e is obtained by the measurement of accurate voltage measurement module.
Compared with prior art, this practical new beneficial effect is:
1, false zero circuit is adopted to produce the Zero potential reference of system, and multiple false zero circuit can be used, produce multiple Zero potential reference, the impact that the noise eliminating power supply ground brings, also can eliminate back the impact that vagabond current produces pressure drop, most of parasitic heat galvanic couple can also be eliminated and produce voltage to the impact of precision voltage source.
2, do not place other elements near constant temperature reference source, circuit adopts broken line to draw, and in constant temperature reference source region, the hollow out process of non-wiring area, increases thermal resistance, improve the stability of constant temperature reference source.
3, voltage reversing circuit is adopted to produce negative energize voltage, strain bridge road adopts the excitation of Symmetrical power supply can realize the output voltage on bridge road at zero crossings, be conducive to the design of bridge road output amplifier, when accurate voltage measurement ADC input range is little, use this programme still can to encourage by high voltage.The driving voltage of sensor input is larger, and the sensitivity of sensor is higher.
4, the sensor parameters of this measurement mechanism can be adjusted, and driving voltage is adjustable, can coordinate the sensor of different parameters; This device with accurate adjustable voltage output function, accurate voltage measurement function.
5, this device realizes the input of calibration system simultaneously of high-accuracy voltage table, output, and the quantity of calibration instrument capable of reducing using, improves calibration speed.
6, this device is by WiFi wave point connecting Internet, and long-range PC can control this measurement mechanism by the Server remote on internet, achieves remote monitoring.
The above embodiment only have expressed this practical several embodiments newly, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to this practical new the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, under the prerequisite not departing from this practical new design, can also make some distortion and improvement, these all belong to this practical new protection domain.Therefore, the protection domain of this practical new patent should be as the criterion with claims.

Claims (5)

1. a wireless accurate strain gauge means, is characterized in that, comprises cabinet, is located at the control panel on cabinet and is located at measurement module, the WiFi module of cabinet inside;
Described control panel is used for realizing man-machine interaction;
Described measurement module comprises digital control module and precision voltage source module; Described precision voltage source module comprises constant temperature reference source, accurate variable voltage source, accurate voltage metering circuit, strain bridge driving circuit and strain bridge metering circuit; Described digital control module comprises processor, debugging interface, serial ports, WiFi module interface;
Described constant temperature reference source connects accurate variable voltage source and accurate voltage metering circuit respectively, and described accurate variable voltage source connects strain bridge driving circuit, and described strain bridge driving circuit connects strain bridge metering circuit; Described WiFi module interface connects WiFi module.
2. wireless accurate strain gauge means according to claim 1, it is characterized in that, the power supply of described digital control module and precision voltage source module is mutually isolated, and ground wire is mutually isolated, does not place other elements around constant temperature reference source; Constant temperature reference source and aerial lug concentrate on two paths; The hollow out process of non-wiring area.
3. wireless accurate strain gauge means according to claim 1, is characterized in that, described strain bridge metering circuit at least comprises a false zero circuit, for eliminating the error that Earth noise and vagabond current pressure drop produce.
4. wireless accurate strain gauge means according to claim 1, is characterized in that, described strain bridge driving circuit comprises voltage reversing circuit, the output terminal of described voltage reversing circuit input termination precision voltage source module; Voltage reversing circuit output terminal as strain bridge driving voltage negative pole, thus creates the excitation power supply of Symmetrical; Described voltage reversing circuit comprises amplifier reverser and PNP triode, described amplifier reverser and PNP triode form and oppositely expand current circuit, described PNP triode base stage and amplifier inverter output are connected to back biased diode, be connected with resistance between PNP triode base stage with amplifier inverter output, be connected with resistance between PNP triode with power cathode.
5. wireless accurate strain gauge means according to claim 3, it is characterized in that, described false zero circuit comprises a pair each other to the push-pull configuration that the triode of pipe forms, described push-pull configuration and an accurate amplifier form a follower, the input end of described push-pull configuration connects positive-negative power by resistance, the zero reference point of the input termination reference source of described follower, the output terminal of follower exports as false zero, and false zero exports and connects with the resistance of 10-100 ohm between the ground wire of precision voltage source module.
CN201520915372.7U 2015-11-16 2015-11-16 Wireless accurate strain measuring device Active CN205209427U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105300269A (en) * 2015-11-16 2016-02-03 广东省自动化研究所 Wireless precision strain measuring device and wireless precision strain measuring method
CN107677200A (en) * 2017-11-16 2018-02-09 苏州大学 High-precision strain measurement system
CN109029749A (en) * 2018-08-17 2018-12-18 黑龙江天有为电子有限责任公司 A kind of water temperature circuit locality deviated and its method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105300269A (en) * 2015-11-16 2016-02-03 广东省自动化研究所 Wireless precision strain measuring device and wireless precision strain measuring method
CN105300269B (en) * 2015-11-16 2019-10-08 广东省智能制造研究所 A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method
CN107677200A (en) * 2017-11-16 2018-02-09 苏州大学 High-precision strain measurement system
CN109029749A (en) * 2018-08-17 2018-12-18 黑龙江天有为电子有限责任公司 A kind of water temperature circuit locality deviated and its method

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Address after: 510000 Building No. 15, compound 100, martyrs Road, Guangzhou, Guangdong

Patentee after: Guangdong Institute of intelligent manufacturing

Address before: 510070 Building No. 13, compound 100, martyrs Road, Guangzhou, Guangzhou, Guangdong

Patentee before: Guangdong Institute of Automation