CN105136357B - A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system - Google Patents
A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system Download PDFInfo
- Publication number
- CN105136357B CN105136357B CN201510634657.8A CN201510634657A CN105136357B CN 105136357 B CN105136357 B CN 105136357B CN 201510634657 A CN201510634657 A CN 201510634657A CN 105136357 B CN105136357 B CN 105136357B
- Authority
- CN
- China
- Prior art keywords
- strain gauge
- bridge arm
- gauge
- foil gauge
- circuit unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention provides a kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system.Including：Electric bridge；The electric bridge has the first reference bridge arm, the second reference bridge arm, working strain gauge bridge arm, with reference to foil gauge bridge arm, the first anti-jamming circuit unit and the second anti-jamming circuit unit；Described first is connected to form with reference to half-bridge with reference to bridge arm with described second with reference to bridge arm, it is described to be also connected to form work half-bridge with the working strain gauge bridge arm with reference to foil gauge bridge arm, described first is connected with reference to bridge arm with the working strain gauge bridge arm by the first anti-jamming circuit unit, and described second is connected with described with reference to bridge arm with reference to foil gauge bridge arm by the second anti-jamming circuit unit；Hollow inclusion strain gauge measuring system：Including strain transducer measurement module and hollow inclusion strain gauge.The present invention, which has, improves foil gauge measurement and the accuracy of hollow inclusion geostress survey and the good effect of stability.
Description
Technical field
The present invention relates to geostress survey technical field, in particular to a kind of foil gauge measuring circuit and hollow bag
Body strain meter measuring system.
Background technology
Hollow inclusion stress relief method is the geostress survey scheme generally used both at home and abroad, by installing glue hollow bag
Body strain meter probe is arranged in suitable drilling, is then closed by drilling to release the rock around drilling with place rock mass
Connection, measures in the strain variation during disassociation on rock core, tested rock mass can be measured according to the mechanical property of rock
Stress state.The mechanical property of rock can obtain according to inquiry, can also pass through the band hollow inclusion strain gauge to drilling through
Rock core carry out calibration operation obtained.Calibration refers to drill through rock core in specific calibration equipment, is filled by calibration
It is standby that rock core is pressurizeed, measure the mechanical characteristic of the deformation on hollow inclusion strain gauge and the Relation acquisition rock of on-load pressure.
Current techniques are measured using multichannel statical strain indicator to the foil gauge installed in hollow inclusion strain gauge, and one
As about 20 meters of distance of the acquisition instrument away from strain gauge.Several measuring strain pieces and a compensation are included in hollow inclusion strain gauge
Foil gauge, one end of all foil gauges link together and are connected to statical strain indicator by a wire, and other end passes through
A piece wire is connected to statical strain indicator, needs 14 core cables altogether, commonly uses 16 core cables and makes, wherein vacant two core is connected to public affairs
Conode, connection diagram is as shown in the Fig. 1 of Figure of description part.
The principle of foil gauge measuring strain is：Its electricity when conductor or semi-conducting material produce mechanical deformation under external force
Respective change also occurs for resistance, therefore can reflect the feelings that foil gauge deforms upon by the change of measuring strain sheet resistance
Condition, the ratio of the relative change of resistance and deformation change are expressed by the sensitivity coefficient of foil gauge, the sensitive system of conventional foil gauge
Number is 2.The instrument of measuring strain sheet resistance change is deformeter, in measurement process, resistance that the mechanical deformation of foil gauge is brought
The value very little of change, sensitivity coefficient are that (microstrain is single for conventional strain for each microstrain of foil gauge that 2 resistances are 120 ohm
Position, measurement result is recorded with microstrain in common engineering) caused by resistance variations be only 2.4 microhms, deformeter typically uses
Bridge circuit measures to foil gauge.
The access of longer wire lead is had during hollow inclusion strain measurement, and then has the access of binding post, wire
Itself there is cable resistance, the joint face of wire and binding post can also have contact resistance, and the resistance of these resistance is much larger than
Microhm, if therefore the circuit such as above-mentioned wire, binding post be connected to inside electric bridge, correlation access measurement result can be brought
Very significant impact, the zero point of measurement is influenceed, bring measurement to disturb；Although the interference of measurement zero point can pass through subsequent technology
Method is modified, but measurement process above-mentioned factor bring influence easily by environmental change and change, such as ring
The many factors such as border temperature change, the change of wire stressing conditions, wire reconnect can all influence cable resistance, contact resistance
Resistance size variation, many uncontrollable interference can be so introduced, these interference are difficult to be disappeared by data processing method
Remove, and then cause the unstable of measurement result, disturbed below by way of calculating to analyze in measurement process in the prior art to measurement
As a result influence situation.
The resistance used is made by hollow inclusion strain gauge to be 120 ohm, counted exemplified by the foil gauge that sensitivity coefficient is 2
Calculate.Foil gauge uses 0.12 square millimeter to about 20 meters of cable length between deformeter, core, the every Europe of core resistance about 2.9
(copper resistance rate is 1.75 × 10 to nurse at 20 degrees Celsius-8Ohm * rice), in normal preparation process, due to shadows such as wire core diameter's differences
Ring, resistance difference is 0.3 ohms between core, about the 10% of line resistance.When cable cuts out short 2 meters (the 10% of cable length),
Resistance difference, which becomes, between cable turns to 0.3 ohm * 2 meters/20 meters=0.03 ohm, and corresponding strain measurement error is 0.03 ohm/120
Ohm/2 ohm /=125 microstrains of strain.
The temperature coefficient of copper is 4.1 × 10-31/ degree Celsius.When environmental change is 10 degrees Celsius, core resistance variations are about
For 0.12 ohm, resistance difference changes about 0.012 ohm between core, and the corresponding measurement error that introduces is answered for 0.012/120/2=50 is micro-
Become.
Typically it is attached using binding post between measurement cable and strain-ga(u)ge measurement passage, is protected during normal use in addition
Hinder contact resistance and be less than 0.005 ohm, rule of thumb, connect about 0.001 ohm of resistance variations, the measurement error of introducing every time
For 0.001/120/2=4 microstrains.
Wire, the resistance of binding post are directly accessed inside electric bridge in current e measurement technology, hollow inclusion strain solutions
Except mud circulates in measurement process, the complicated factor such as drill bit friction can cause the resistance hair of hollow inclusion strain gauge probe and cable
Changing, it is attached the change that can also cause contact resistance on terminal during calibration to strain gauge and electric bridge collector again, it is right
Larger error is had when hollow inclusion strain gauge measures, has certain influence to the accuracy of measurement result.It is in addition, current
There is the application that hollow inclusion strain gauge is used for strain path monitoring in engineering, needed in monitoring process in longer period
Repeatedly same strain gauge is measured, the time interval between measurement can be designed as needed, each monitoring point peace
Fill the scheme that a deformeter is monitored and avoid the monitoring error for reconnecting terminal introducing, but cost can be carried greatly
Height, the mode of inspection measure to hollow inclusion strain gauge, reconnect the meeting strong influence monitoring of terminal measurement error
The quality of data, there is certain negative effect to the effect of application.
In the structure and measuring method of present hollow inclusion strain gauge, measurement interference caused by leader cable and connection terminal
It is larger, and be difficult to handle by later data and eliminate the effects of the act, the degree of accuracy of measurement and stability be not high, the effect band being used for
Carry out detrimental effect.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of foil gauge measuring circuit and hollow inclusion strain gauge
Measuring system, reduce measurement interference, raising accuracy of measurement and survey caused by the access of wire cable and connection terminal to reach
Measure the purpose of stability.
For the above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of foil gauge measuring circuit, including：Electric bridge；
The electric bridge have first with reference to bridge arm, second with reference to bridge arm, working strain gauge bridge arm, with reference to foil gauge bridge arm,
First anti-jamming circuit unit and the second anti-jamming circuit unit；
Described first is connected to form with reference to half-bridge with reference to bridge arm with described second with reference to bridge arm, described to refer to strain gage bridge
Arm is also connected to form work half-bridge with the working strain gauge bridge arm；
Described first is connected with reference to bridge arm with the working strain gauge bridge arm by the first anti-jamming circuit unit,
Described second is connected with described with reference to bridge arm with reference to foil gauge bridge arm by the second anti-jamming circuit unit；
Described first with reference to bridge arm and described second with reference to the node between bridge arm and the working strain gauge bridge arm with
Node between the bridge arm with reference to foil gauge is measurement output node；
Described first refers to bridge with reference to the node between bridge arm and the first anti-jamming circuit unit and described second
Node between arm and the second anti-jamming circuit unit is bridge-drive node；
The first anti-jamming circuit unit and the second anti-jamming circuit unit, for reducing wire cable and company
The access of connecting terminal and bring measurement interference.
The foil gauge measuring circuit also includes：The 3rd amplifying circuit being connected with the measurement output node.
The working strain gauge bridge arm includes working strain gauge, and the working strain gauge is used for and the described first anti-interference electricity
Two wire connectors of end set of road unit connection；
It is described to include referring to foil gauge with reference to foil gauge bridge arm, it is described to be used for and the described second anti-interference electricity with reference to foil gauge
Two wire connectors of end set of road unit connection.
The first anti-jamming circuit unit is provided with the first amplifier, and the second anti-jamming circuit unit is put provided with second
Big device；
The working strain gauge is used to by two wires distinguish with the end that the first anti-jamming circuit unit is connected
It is connected to the output channel and feedback channel of first amplifier；
It is described to be used to by two wires distinguish with the end that the second anti-jamming circuit unit is connected with reference to foil gauge
It is connected to the output channel and feedback channel of the second amplifier.
The working strain gauge is used to by two wires distinguish with the end that the first anti-jamming circuit unit is connected
The output channel and feedback channel for being connected to first amplifier include：
Wherein, multiway analog switch is provided with the wire, the first anti-jamming circuit unit is simultaneously corresponding multiple
Working strain gauge；
It is described to be used to by two wires distinguish with the end that the second anti-jamming circuit unit is connected with reference to foil gauge
The output channel and feedback channel for being connected to the second amplifier also include：
Wherein, multiway analog switch is provided with the wire, the second anti-jamming circuit unit is simultaneously corresponding multiple
With reference to foil gauge.
The connection of 3rd amplifying circuit and the measurement output node is realized also by multiway analog switch, so as to real
The program control handover measurement of existing multichannel strain output signal.
A kind of hollow inclusion strain gauge measuring system, including：Strain transducer measurement module and hollow inclusion strain gauge, institute
Stating hollow inclusion strain gauge includes working strain gauge and is arranged on hollow strain gauge shell table with reference to foil gauge, working strain gauge
Face, it is described to be arranged on reference to foil gauge inside hollow inclusion strain gauge；The strain transducer measurement module is used for the work
Make foil gauge and the foil gauge that refers to measures, the strain transducer measurement module includes at least one foil gauge and measured
Circuit.
The hollow inclusion strain gauge refers to foil gauge, the working strain gauge with 12 working strain gauges and one
It is respectively arranged in the different azimuth of the hollow inclusion strain gauge surface of shell；Each working strain gauge should with the reference
Become piece and be respectively provided with two end points, each working strain gauge and one of end points with reference to foil gauge are connected to together
One node, drawn using two cables；Another end points is independent, and is drawn using two wires, respectively with the strain
First anti-jamming circuit unit of the foil gauge measuring circuit in sensor measurement module and the second anti-jamming circuit unit phase
Connection.
Preferably, described hollow inclusion strain gauge measuring system, in addition to：The measuring resistance of low excursion with temperature；
The measuring resistance of the low excursion with temperature is arranged in strain gauge housing, the measuring resistance tool of the low excursion with temperature
There are two end points, one of end points is connected to the working strain gauge and one of end points with reference to foil gauge
Same node；Another end points is independent, and is drawn using two wires, is connected with the strain transducer measurement module；
The measuring resistance of the low excursion with temperature, foil gauge variation with temperature is referred to for measuring, correction-compensation measurement
As a result.
Preferably, the hollow inclusion strain gauge also includes：Temperature sensor；
The temperature sensor is one kind in thermistor, RTD and thermocouple, or the temperature sensor is
1-wire digital temperature sensor；
The temperature sensor is arranged on strain gauge enclosure interior, and is in close contact with housing；
The temperature sensor, for measuring the temperature change of the hollow inclusion strain gauge working environment.
A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system provided by the present invention, due to work strain
Piece and reference foil gauge are respectively arranged with the first anti-jamming circuit unit, the second anti-jamming circuit unit, therefore, are using work
When foil gauge carries out stress measurement, zero point error caused by the introducing of leader cable, connection terminal can be suppressed, and also press down
Make because of further measurement interference caused by the change of measuring environment temperature etc. and the change of leader cable length, had and carry
The accuracy of Large strain piece measurement and the good effect of stability, to improving the success rate of hollow inclusion geostress survey and accurate
Degree has very big help.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows the connection diagram of hollow inclusion strain gauge measuring system of the prior art；
Fig. 2 shows a kind of principle schematic of foil gauge measuring circuit provided in the embodiment of the present invention；
Fig. 3 shows a kind of foil gauge measuring circuit active gage switching principle signal provided in the embodiment of the present invention
Figure；
Fig. 4 shows a kind of structural representation of hollow inclusion strain gauge measuring system provided in the embodiment of the present invention
Figure；
Fig. 5 shows the structural representation of another hollow inclusion strain gauge measuring system provided in the embodiment of the present invention
Figure；
Fig. 6 shows the structural representation of another hollow inclusion strain gauge measuring system provided in the embodiment of the present invention
Figure；
Reference is as follows：
110th, the first amplifier；111st, the first contact resistance；112nd, the first cable resistance；113rd, the second contact resistance；
114th, the second cable resistance；120th, first bridge arm is referred to；130th, second bridge arm is referred to；140th, the second amplifier；141st, the 3rd connect
Get an electric shock and hinder；142nd, the 3rd cable resistance；143rd, the 4th cable resistance；144th, the 4th contact resistance；150th, the 3rd amplifying circuit；
160th, working strain gauge；170th, with reference to foil gauge；310th, strain transducer measurement module；320th, multiway analog switch；340th, mark
Quasi- resistance；410th, temperature sensor；
Wherein, A, As, C, Cs, A ', C ' represent circuit node respectively.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be configured to arrange and design with a variety of herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
A kind of foil gauge measuring circuit that embodiment as shown in Figure 2 provides, including：Electric bridge；
Above-mentioned electric bridge has the first reference reference of bridge arm 120, second bridge arm 130, working strain gauge bridge arm, with reference to foil gauge
Bridge arm, the first anti-jamming circuit unit and the second anti-jamming circuit unit.
Above-mentioned first is connected to form with reference to half-bridge with reference to bridge arm 120 with above-mentioned second with reference to bridge arm 130, and above-mentioned reference should
Become piece bridge arm and be also connected to form work half-bridge with above-mentioned working strain gauge bridge arm.
Above-mentioned first is connected with reference to bridge arm 120 with above-mentioned working strain gauge bridge arm by the first anti-jamming circuit unit,
Above-mentioned second is connected with above-mentioned with reference to bridge arm 130 with reference to foil gauge bridge arm by the second anti-jamming circuit unit.
First should with reference with reference to the node between bridge arm 130 and working strain gauge bridge arm with reference to bridge arm 120 and second
The node become between piece bridge arm is measurement output node；
First refers to bridge arm 130 with reference to the node between the anti-jamming circuit unit of bridge arm 120 and first and described second
Node between the second anti-jamming circuit unit is driving node；
Above-mentioned first anti-jamming circuit unit and above-mentioned second anti-jamming circuit unit, for reducing wire cable and company
The access of connecting terminal and bring measurement interference.
The first anti-jamming circuit unit, second anti-is connected to due to working strain gauge bridge arm and with reference to foil gauge bridge arm
Circuit unit is disturbed, therefore, when carrying out stress measurement using working strain gauge, leader cable, connection terminal can be suppressed
Measurement interference caused by introducing, and also inhibits the change because of measuring environment temperature etc. and the change institute of leader cable length
The further measurement interference brought, therefore with the accuracy for improving foil gauge measurement and the good effect of stability.
As shown in Fig. 2 above-mentioned foil gauge measuring circuit, in addition to：The 3rd to be connected with the measurement output node
Amplifying circuit 150, the 3rd amplifying circuit are used for the output characteristics for improving bridge circuit；Specifically, above-mentioned measurement output node
The input channel with the 3rd amplifying circuit 150 is connected respectively；In certain embodiments, the 3rd amplifying circuit 150 is defeated
Go out passage and be connected to A/D converter.
Above-mentioned working strain gauge bridge arm includes working strain gauge 160, and the working strain gauge 160, which is used to resist with described first, to be done
The end set for disturbing circuit unit connection has two wire connectors；
It is above-mentioned to include referring to foil gauge 170 with reference to foil gauge bridge arm, it is above-mentioned to be used to resist with described second with reference to foil gauge 170
Disturb two wire connectors of end set of circuit unit connection；Why respectively set two wire connectors, be in order to
One end of working strain gauge 160 is connected to the first anti-jamming circuit unit by two wires, can also equally meet
With reference to one end of foil gauge 170 the second anti-jamming circuit unit is connected to by two wires.
Further, above-mentioned first anti-jamming circuit unit is provided with the first amplifier 110, above-mentioned second anti-jamming circuit list
Member is provided with the second amplifier 140；The end that above-mentioned working strain gauge 160 is used to be connected with the first anti-jamming circuit unit leads to
Cross output channel and feedback channel that two wires are respectively connecting to first amplifier 110；It is above-mentioned to be used with reference to foil gauge 170
In the output for being respectively connecting to the second amplifier 140 by two wires with the end that the second anti-jamming circuit unit is connected
Passage and feedback channel.
Below in conjunction with the accompanying drawings 2, the present embodiment is more specifically introduced, one end of above-mentioned working strain gauge 160 passes through two
Root wire is connected to the first amplifier 110, and the access of two wires can all bring interference resistance i.e.：Contact resistance and cable electricity
Resistance, if the interference resistance of two wires is respectively the first contact resistance 111, the first cable resistance 112 and the second contact resistance
113rd, the second cable resistance 114；Equally, if one end with reference to foil gauge 170 is connected to the second amplifier by two wires
140, then the interference resistance that two wires introduce is respectively：3rd contact resistance 141, the 3rd cable resistance 142 and the 4th
Cable resistance 143, the 4th contact resistance 144, and with A, As, C, Cs, A ', C ' mark different circuit nodes respectively.
In the foil gauge measuring circuit that embodiment as shown in Figure 2 provides, due to being provided with the first anti-jamming circuit list
Member and the second anti-jamming circuit unit, wherein the presence of the first amplifier and the presence of the second amplifier can cause foil gauge to measure
Circuit has following characteristic：
1st, it is identical with the current potential at node As at node A, it is identical with the current potential at node Cs at node C；
2nd, the electric current at node As and node Cs is minimum, can reach pico-ampere (10-12Ampere) rank；
The disturbed condition of the present embodiment is analyzed by taking A nodes as an example below, C nodes can also draw similar conclusion：
A is identical with As current potentials, voltage VAA’=VAsA’=Rsen*Isen, wherein, IsenFor the electric current of AsA ' passages, RsenFor
The resistance of AsA ' passages, order interference resistance is Rn1, then Rn1=Rsen*Isen/IAA’, electric current IAA’Size and electric bridge bridge press and work
Make that foil gauge resistance is relevant, typically 2.4 volts of bridge voltages, resistance are used in measuring circuit commonly used in certain embodiments
For 120 ohm of working strain gauge, now IAA’About 10 milliampere (10-3Ampere, and IsenIt is only relevant with the first amplifier characteristic,
About 1 pico-ampere (when selecting the model ADA4505 of the first amplifier, IsenParameter index be 0.5 pico-ampere), therefore disturb electricity
Hinder Rn1≈Rsen/107, that is, disturb resistance to be reduced to thousand original a ten thousandths, greatly improve the anti-interference energy of measuring circuit
Power.
Therefore can from which further follow that, the foil gauge measuring circuit provided using the present embodiment can be by measuring circuit
Interference resistance be reduced to thousand a ten thousandths of existing measuring circuit, even more so that interference can be ignored completely in measurement process
Measurement influences caused by resistance, greatly improves the antijamming capability of measuring circuit.
Further, since above-mentioned foil gauge measuring circuit can greatly reduce access and the binding post of wire cable
Measurement interference caused by introducing, therefore in actual applications, staff only needs to consider when carrying out the selection of wire cable
Make the uniformity of cable core preferable, therefore reduce further the quality requirement to the measure traverse line cable of foil gauge.
In addition, the end that above-mentioned working strain gauge 160 is used to be connected with the first anti-jamming circuit unit is by two
Wire, which is respectively connecting to the output channel of first amplifier and feedback channel, to be included：Wherein, set on the wire
Multiway analog switch is equipped with, the first anti-jamming circuit unit can correspond to multiple working strain gauges simultaneously；As shown in figure 3,
Above-mentioned first amplifier 110 can connect multiple working strain gauges by multiway analog switch 320, by controlling multi-channel analog to open
Close the different working strain gauge of gating and measure work.Multiway analog switch realizes the gating excitation of multiple foil gauges, reduces
The complexity and power consumption of multichannel bridge measuring circuit.
It is above-mentioned to be used to pass through two wires point with the end that the second anti-jamming circuit unit is connected with reference to foil gauge 170
The output channel and feedback channel for not being connected to the second amplifier also include：
Wherein, multiway analog switch is provided with the wire, the second anti-jamming circuit unit can correspond to simultaneously
It is multiple to refer to foil gauge.It can realize that multiple gatings with reference to foil gauge use using analog switch, realize the benefit of measuring circuit
Repay the flexible setting of position.
In addition, the connection of the 3rd amplifying circuit 150 and above-mentioned measurement output node can also be real by multiway analog switch
It is existing, so as to realize the program control handover measurement of multichannel strain output signal, reduce requirement of the measuring circuit to A/D converter.
In summary, the measuring circuit that the present embodiment is provided, resistance, the binding post of wire cable are significantly reduced
The interference that the external interference such as resistance of introducing resistance works strain measurement, has the positive effect that：
1st, measurement cable, which cuts out short or reconnect, does not influence the continuity of measurement data；
2nd, the change of measuring environment does not influence the stability of measurement data；
3rd, the data of long interval of time non-continuous are consistent, and inspection data can be used for being analyzed；
4th, stability and the degree of accuracy of measurement are drastically increased；
5th, it is relatively low to the quality requirement of wire cable, save cost；
6th, circuit power consumption can be reduced.
Foil gauge measuring circuit provided by the present invention, except can be used for measuring strain, it can be used for temperature, pressure
The other kinds of resistance output type sensor such as power measures.
The present invention is designed using low consumption circuit, can meet need of work using battery powered pattern, without extra
It is powered, meets power supply requirement when it works under the particular surroundings such as field；In addition, the first anti-jamming circuit unit with
And second the design of anti-jamming circuit unit there is Current Voltage output limiting facility, therefore, measurement electricity provided by the present invention
Road also meets the needs of intrinsically safe circuit design.
In embodiment as shown in Figure 4, a kind of hollow inclusion strain gauge measuring system is present embodiments provided, including：Should
Become sensor measurement module 310 and hollow inclusion strain gauge, hollow inclusion strain gauge includes working strain gauge 160 and with reference to strain
Piece 170, working strain gauge 160 is arranged on hollow strain gauge case surface, cementing with rock in work, measures the deformation of rock,
It is above-mentioned to be arranged on reference to foil gauge 170 inside hollow inclusion strain gauge, it is not cementing with any object in work, for measuring bridge
The compensation bridge arm of circuit；Above-mentioned strain transducer measurement module 310 is used to enter to working strain gauge 160 and with reference to foil gauge 170
Row measurement, strain transducer measurement module 310 include at least one foil gauge measuring circuit.
Further, above-mentioned hollow inclusion strain gauge refers to foil gauge with 12 working strain gauges 160 and one
170, working strain gauge point 160 is not arranged in the different azimuth of the hollow inclusion strain gauge surface of shell, to realize to difference
The measurement of direction crustal stress；Each working strain gauge 160 with reference to foil gauge 170 with being respectively provided with two end points, each work strain
Piece and each one of end points with reference to foil gauge are commonly connected to same node, are drawn using two cables；Other one
Individual end points is independent, and is drawn using two wires, is measured respectively with the foil gauge in the strain transducer measurement module 310
The the first anti-jamming circuit unit and the second anti-jamming circuit unit of circuit are connected.
In embodiment as shown in Figure 5, above-mentioned hollow inclusion strain gauge measuring system, in addition to：Low excursion with temperature
Measuring resistance 340；The measuring resistance 340 of the low excursion with temperature is arranged in strain gauge housing, the measuring resistance of low excursion with temperature
340 have two end points, and one of end points is connected jointly with working strain gauge and with reference to one of end points of foil gauge
To same node；Another end points is independent, and is drawn using two wires, is connected with strain transducer measurement module 310；
The measuring resistance 340 of described low excursion with temperature, foil gauge variation with temperature is referred to for measuring, correction-compensation measurement knot
Fruit.
For the measuring resistance 340 of above-mentioned low excursion with temperature in temperature change, its change in resistance is minimum, can using this characteristic
Measured with reference to foil gauge variation with temperature using the measuring resistance 340 of the low excursion with temperature, for obtaining for measurement work
Measurement result provides reference, further increases the accuracy of measurement.
In embodiment as shown in Figure 6, above-mentioned hollow inclusion strain gauge measuring system, described hollow inclusion strain gauge
Also include：Temperature sensor 410.
Above-mentioned temperature sensor can be digital temperature sensor or analog temperature sensor, wherein mould
The temperature sensor of plan formula is preferably thermistor, RTD or thermocouple etc., and digital temperature sensor is preferably single
Bus digital temperature sensor.
Said temperature sensor is arranged on strain gauge enclosure interior, and is in close contact with housing.
The temperature sensor, for measuring the temperature change of the hollow inclusion strain gauge working environment, for the people that works
Reference data in terms of analysis offer temperature change of the member to measurement result, and then can further improve the standard of measurement result
True property.
When in use, the exporting change of strain gauge is larger during temperature change, can influence to measure for existing hollow inclusion strain gauge
Precision, moreover, strain gauge measure traverse line cable cut can introduce measurement error, influence calibration work；And wire cable draws
The error entered is directly proportional to its length of cable, therefore can limit the change of strain gauge cable length, can further make strain gauge
Using being restricted；In addition, the reconnect work of wiring can introduce measurement error, influence calibration and strain gauge patrol mode is surveyed
Accuracy of measurement.
Therefore, equally can be with after hollow inclusion strain gauge provided by the present invention uses above-mentioned foil gauge measuring circuit
Reach following good effect：
1st, measurement cable, which cuts out short or reconnect, does not influence the continuity of measurement data；
2nd, the change of measuring environment does not influence the stability of measurement data；
3rd, the data of long interval of time non-continuous are consistent, and inspection data can be used for being analyzed；
4th, the stability and the degree of accuracy of measurement are high；
5th, the flexibility of measurement is improved.
Hollow inclusion strain gauge provided by the present invention, each working strain gauge node and reference foil gauge node draw two
Root wire (cable core) is connected to the first anti-jamming circuit unit and the second anti-jamming circuit of the foil gauge measuring circuit
Unit, hollow inclusion strain gauge probe coordinate with the foil gauge measuring circuit, and hollow inclusion strain gauge can be greatly improved
Antijamming capability, and then can be greatly enhanced its measurement stability, the degree of accuracy and the flexibility used.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
- A kind of 1. foil gauge measuring circuit, it is characterised in that including：Electric bridge；The electric bridge has the first reference bridge arm, the second reference bridge arm, working strain gauge bridge arm, with reference to foil gauge bridge arm, first Anti-jamming circuit unit and the second anti-jamming circuit unit；Described first is connected to form with reference to half-bridge with reference to bridge arm with described second with reference to bridge arm, and the reference foil gauge bridge arm is also Work half-bridge is connected to form with the working strain gauge bridge arm；Described first is connected with reference to bridge arm with the working strain gauge bridge arm by the first anti-jamming circuit unit, described Second is connected with described with reference to bridge arm with reference to foil gauge bridge arm by the second anti-jamming circuit unit；Described first with reference to bridge arm and described second with reference to the node between bridge arm and the working strain gauge bridge arm with it is described It is measurement output node with reference to the node between foil gauge bridge arm；Described first with reference to the node between bridge arm and the first anti-jamming circuit unit and described second with reference to bridge arm with Node between the second anti-jamming circuit unit is bridge-drive node；The first anti-jamming circuit unit and the second anti-jamming circuit unit, for reducing wire cable and connection end Son access and bring measurement interference；The working strain gauge bridge arm includes working strain gauge, and the working strain gauge is used for and the first anti-jamming circuit list Two wire connectors of end set of member connection；It is described to include referring to foil gauge with reference to foil gauge bridge arm, it is described to be used for and the second anti-jamming circuit list with reference to foil gauge Two wire connectors of end set of member connection；The first anti-jamming circuit unit is provided with the first amplifier, and the second anti-jamming circuit unit is provided with the second amplification Device；The working strain gauge is used to connect respectively by two wires with the end that the first anti-jamming circuit unit is connected To the output channel and feedback channel of first amplifier；It is described to be used to connect respectively by two wires with the end that the second anti-jamming circuit unit is connected with reference to foil gauge To the output channel and feedback channel of the second amplifier.
- 2. foil gauge measuring circuit according to claim 1, it is characterised in that also include：With the measurement output node The 3rd amplifying circuit being connected.
- 3. foil gauge measuring circuit according to claim 1, it is characterised in that the working strain gauge is used for and described the The end of one anti-interference circuit unit connection is respectively connecting to the output channel of first amplifier and anti-by two wires Feedthrough road includes：Wherein, multiway analog switch, the first anti-jamming circuit unit corresponding multiple work simultaneously are provided with the wire Foil gauge；It is described to be used to connect respectively by two wires with the end that the second anti-jamming circuit unit is connected with reference to foil gauge Output channel and feedback channel to the second amplifier also include：Wherein, multiway analog switch, the second anti-jamming circuit unit corresponding multiple references simultaneously are provided with the wire Foil gauge.
- 4. foil gauge measuring circuit according to claim 3, it is characterised in that the 3rd amplifying circuit and the measurement The connection of output node is realized also by multiway analog switch, so as to realize the program control handover measurement of multichannel strain output signal.
- A kind of 5. hollow inclusion strain gauge measuring system, it is characterised in that including：Strain transducer measurement module and hollow inclusion Strain gauge, the hollow inclusion strain gauge include working strain gauge and are arranged on described with reference to foil gauge, the working strain gauge Hollow strain gauge case surface, it is described to be arranged on reference to foil gauge inside hollow inclusion strain gauge；The strain transducer measurement Module is used to measure the working strain gauge and the foil gauge that refers to, and the strain transducer measurement module is included extremely Any described foil gauge measuring circuit in a few the claims 1-4.
- 6. hollow inclusion strain gauge measuring system according to claim 5, it is characterised in that the hollow inclusion strain gauge Foil gauge is referred to 12 working strain gauges and one, the working strain gauge is respectively arranged to be strained in the hollow inclusion Count the different azimuth of surface of shell；Each working strain gauge is respectively provided with two end points, Mei Gesuo with described with reference to foil gauge State working strain gauge and one of end points with reference to foil gauge is connected to same node, drawn using two cables； Another end points is independent, and is drawn using two wires, respectively with the foil gauge in the strain transducer measurement module The the first anti-jamming circuit unit and the second anti-jamming circuit unit of measuring circuit are connected.
- 7. hollow inclusion strain gauge measuring system according to claim 6, it is characterised in that also include：Low excursion with temperature Measuring resistance；The measuring resistance of the low excursion with temperature is arranged in strain gauge housing, and the measuring resistance of the low excursion with temperature has two Individual end points, one of end points are connected to same with the working strain gauge and one of end points with reference to foil gauge Node；Another end points is independent, and is drawn using two wires, is connected with the strain transducer measurement module；The measuring resistance of the low excursion with temperature, foil gauge variation with temperature, correction-compensation measurement result are referred to for measuring.
- 8. hollow inclusion strain gauge measuring system according to claim 5, it is characterised in that the hollow inclusion strain gauge Also include：Temperature sensor；The temperature sensor is one kind in thermistor, RTD and thermocouple, or the temperature sensor is single total Line digital temperature sensor；The temperature sensor is arranged on strain gauge enclosure interior, and is in close contact with housing；The temperature sensor, for measuring the temperature change of the hollow inclusion strain gauge working environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510634657.8A CN105136357B (en) | 2015-09-29 | 2015-09-29 | A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510634657.8A CN105136357B (en) | 2015-09-29 | 2015-09-29 | A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105136357A CN105136357A (en) | 2015-12-09 |
| CN105136357B true CN105136357B (en) | 2017-11-17 |
Family
ID=54721789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510634657.8A Active CN105136357B (en) | 2015-09-29 | 2015-09-29 | A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105136357B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530255B (en) * | 2019-09-04 | 2021-06-11 | 中国电建集团中南勘测设计研究院有限公司 | Rubber fork type triaxial strain gauge cable connecting device for ground stress test, triaxial strain gauge and using method of triaxial strain gauge cable connecting device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3847017A (en) * | 1972-03-20 | 1974-11-12 | Welwyn Electric Ltd | Strain measuring system |
| CN1721813A (en) * | 2004-07-14 | 2006-01-18 | 扬州泰司电子有限公司 | Constant-current type static resistance strain gauge |
| CN201672998U (en) * | 2010-04-23 | 2010-12-15 | 安徽理工大学 | Wall rock drill-hole multi-point stress gage |
| CN203534737U (en) * | 2013-07-05 | 2014-04-09 | 河南理工大学 | Temperature sensor-based testing device for hollow inclusion stress gauges |
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
| CN205027466U (en) * | 2015-09-29 | 2016-02-10 | 中国地质科学院地质力学研究所 | Foil gage measuring circuit and hollow inclusion strainometer measurement system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5663227A (en) * | 1979-10-30 | 1981-05-29 | Toshiba Corp | Pressure detecting device |
| WO2009016994A1 (en) * | 2007-07-27 | 2009-02-05 | Alps Electric Co., Ltd. | Bridge circuit output voltage offset adjustment circuit |
-
2015
- 2015-09-29 CN CN201510634657.8A patent/CN105136357B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3847017A (en) * | 1972-03-20 | 1974-11-12 | Welwyn Electric Ltd | Strain measuring system |
| CN1721813A (en) * | 2004-07-14 | 2006-01-18 | 扬州泰司电子有限公司 | Constant-current type static resistance strain gauge |
| CN201672998U (en) * | 2010-04-23 | 2010-12-15 | 安徽理工大学 | Wall rock drill-hole multi-point stress gage |
| CN203534737U (en) * | 2013-07-05 | 2014-04-09 | 河南理工大学 | Temperature sensor-based testing device for hollow inclusion stress gauges |
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
| CN205027466U (en) * | 2015-09-29 | 2016-02-10 | 中国地质科学院地质力学研究所 | Foil gage measuring circuit and hollow inclusion strainometer measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105136357A (en) | 2015-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103412176B (en) | Real-time on-line monitoring sensor for current of alternating current-direct current arrester based on magnetoresistance | |
| CN104391480B (en) | Expert system based numerically-controlled machine tool fault diagnosis system | |
| CN106018942A (en) | Current sensor array used for measuring three-phase current and measuring method thereof | |
| JP6125650B2 (en) | Hot stick power analyzer | |
| CN103278693A (en) | Probe contact resistance measuring method | |
| CN108008177A (en) | Multi-axis magnetoresistive current measurement method, device, equipment and system | |
| CN107101741A (en) | A kind of temp measuring system and method | |
| CN105651409A (en) | Thermocouple cold junction compensation and temperature measurement circuit and device | |
| CN105675991A (en) | Universal tester for testing fire work equipment | |
| CN110160608A (en) | A kind of magnetostriction liquidometer that signal waveform is shown | |
| CN202994893U (en) | Transformer iron-core grounding current monitoring device | |
| CN105136357B (en) | A kind of foil gauge measuring circuit and hollow inclusion strain gauge measuring system | |
| CN104625276A (en) | On-line operation parameter real-time monitoring system and method of spark machine | |
| CN208888303U (en) | Wire current measuring system | |
| CN200996875Y (en) | Multi-channel temperature-measuring recorder | |
| CN102012279A (en) | Dual-constant current source temperature measurement system for thermal resistor | |
| CN205027466U (en) | Foil gage measuring circuit and hollow inclusion strainometer measurement system | |
| CN108204865A (en) | Industrial instrument, industrial control system and RTD temp measuring methods | |
| CN201569513U (en) | Device for measuring coal bed temperature | |
| CN201134617Y (en) | Bus temperature and current synthetic monitoring apparatus for high-low voltage distribution cabinet | |
| CN209342156U (en) | A kind of monitoring system for radioactive environment | |
| CN211085507U (en) | Single ADC multichannel temperature monitoring circuit controlled by GPIO | |
| US20220341862A1 (en) | System and method for continuously and intelligently measuring water content of subgrade in real time | |
| CN207798931U (en) | A kind of Multi-purpose non-contact electricity tester | |
| CN208537602U (en) | A kind of emulation clamp on amperemeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |