CN207798717U - A kind of electrometric sensor for testing linear expansion coefficient - Google Patents
A kind of electrometric sensor for testing linear expansion coefficient Download PDFInfo
- Publication number
- CN207798717U CN207798717U CN201721730316.1U CN201721730316U CN207798717U CN 207798717 U CN207798717 U CN 207798717U CN 201721730316 U CN201721730316 U CN 201721730316U CN 207798717 U CN207798717 U CN 207798717U
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- China
- Prior art keywords
- deformation
- expansion coefficient
- linear expansion
- foil gauge
- bridge
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Abstract
The utility model is related to a kind of electrometric sensors for testing linear expansion coefficient, including a thin plate, the resistance strain gage for constituting two kinds of bridges is pasted above, come complete linear expansion coefficient determining two kinds of Small variables data test job, the test of deformation quantity realizes temperature self-compensation, the test of temperature variation counteracts deformation variation, i.e. a sensor construction integrates two kinds of electric bridges, two kinds of small quantity signals are tested simultaneously, the synchronism output for realizing two kinds of signals in use improves the precision of output data.
Description
Technical field
The utility model is related to a kind of electrometric sensors for testing linear expansion coefficient, belong to solid material line expansion system
Number testing field.
Background technology
Linear expansion coefficient is one of the major parameter of materials thermophysics performance, can not only weigh the thermal stability of material, but also is
The key parameter of material thermal expansion coefficient is calculated, generally can vary with temperature caused length variation by measuring solid material
It determines.I.e. its test key factor it is main there are two：The accurate consistency measured with test process temperature of small quantity.Generally
Traditional measurement method measures inconvenient and limitation due to such as the methods of length-measured telescope, optical lever and amesdial
Larger, generated accidental error can cause measurement accuracy to reduce.
Utility model content
The purpose of this utility model is to provide a kind of electrometric sensor for testing linear expansion coefficient, to solve tradition
The relatively low problem of Small variables measuring accuracy in measurement method.
To achieve the above object, the embodiment of the utility model includes：
A kind of electrometric sensor for testing linear expansion coefficient of the utility model, including following scheme：
Scheme one, including deformation plate, fixing device and two identical deformation foil gauges for measuring deformation；The shape
It includes two edges in left and right to become plate, and the edge of the left and right two is both secured in the fixing device；The front side of the deformation plate
Face is used to incude the deformation of detected materials, posts the deformation foil gauge on trailing flank, a deformation foil gauge is affixed on the shape
Become plate from left hand edge to from the 1/2 of right hand edge distance, another deformation foil gauge is affixed on the deformation plate from left hand edge to the right
At the 1/4 of edge distance or at 3/4；2 deformation foil gauges constitute the deformation bridge circuit for measuring deformation, and position respectively
In on different deformation electric bridge bridge arms.
Foil gauge is arranged at 1/2 on thin plate length direction and at 1/4 this programme, and thin plate is because of temperature deformation after series connection
Deformation quantity cancel out each other, can finally obtain the result based on true deformation；And the electrical measurement mode precision based on foil gauge
It is high.
Scheme two, on the basis of scheme one, on the trailing flank of the deformation plate also patch there are five it is identical, for measuring
The thermometric foil gauge of temperature change, three thermometric foil gauges are affixed on 1/ of the deformation plate from left hand edge to right hand edge distance
At 4 or at 3/4, two thermometric foil gauges are affixed on the deformation plate from left hand edge to from the 1/2 of right hand edge distance, described
Five thermometric foil gauges constitute the bridge for measuring temperature circuit for measuring temperature variation, thermometric foil gauge at described 1/2 and described
Thermometric foil gauge at 1/4 or 3/4 is serially connected with respectively in different bridge for measuring temperature bridge arms.
The single foil gauge strain deformation amount in thin plate midpoint is 3/2 times at 1/4, to arrange 2n at thin plate midpoint 1/2
A foil gauge arranges 3n foil gauge at thin plate 1/4, and true deformation signal is cancelled out each other in the result exported, is exported
Pertain only to thin plate be affected by temperature and the signal that generates.
Scheme three, on the basis of scheme two, the deformation foil gauge and thermometric foil gauge are Karma ni-Cd high-resistance alloy
Resistance strain gage.
Karma nickel chromium triangle high-resistance alloy has many advantages, such as that the big range of linearity, high sensitivity and high temperature resistance are tired.
Scheme four, on the basis of scheme two, the deformation bridge circuit and the bridge for measuring temperature circuit are half-bridge circuit.
Half-bridge circuit can reject some parameters unrelated with measurement when foil gauge works, and obtain the true of test parameter
Value.
Scheme five, on the basis of scheme one or scheme two or scheme three or scheme four, the deformation plate left and right edges are embedding
Enter the fixing device；It is additionally provided with backboard, the backboard both ends are also embedded in the fixing device, the backboard and the deformation
Plate forms cavity between trailing flank.
Scheme six, on the basis of scheme five, the backboard offers through-hole, and through-hole is equipped with for wiring, separate
The hollow guide sleeve that deformation plate direction extends connects the outlet line of the deformation foil gauge, thermometric foil gauge from institute
It states and is pierced by among guide sleeve.
Scheme seven, on the basis of scheme six, be provided on the guide sleeve external screw thread and with the external screw thread phase
The fixation nut matched.
Using with externally threaded guide sleeve attaching nut, installation when convenient for test is fixed.
Scheme eight, on the basis of scheme six, the open end of the guide sleeve is provided with the plug of the fixed outlet line
Son.
Scheme nine, on the basis of scheme eight, the plug is stopper.
Scheme ten, on the basis of scheme five, the fixing device is ceramic block, is provided on ceramic block for being embedded in
State the groove of backboard and deformation plate.
Description of the drawings
Fig. 1 is the structural schematic diagram of the electrometric sensor for testing linear expansion coefficient of the utility model；
Fig. 2 is temperature self-compensation test strain half-bridge circuit schematic diagram；
Fig. 3 is deformation-compensated test temperature variation half-bridge circuit schematic diagram；
Fig. 4 is two kinds of bridge arrangement schematic diagrams on sheet metal.
Specific implementation mode
The utility model is described in more detail below in conjunction with the accompanying drawings.
The structural schematic diagram of the electrometric sensor for testing linear expansion coefficient of the utility model as shown in Figure 1, packet
The sheet metal 7 for incuding solid material deformation and temperature change is included, it is consolidating for ceramic material that sheet metal 7, which is embedded in both ends,
Determine on block 8, inlayed fixed plate 9 on fixed block 8 again, fixed plate 9 forms an inner cavity 5 with sheet metal 7, posted in inner cavity 5
Identical foil gauge 6, foil gauge 6 connect the circuit to form two kinds of testing for traces through bridge, and a bridge can realize that temperature is self-complementary
It repays, tests the true deformation quantity of solid material, another bridge is used for test temperature variable quantity, and foil gauge 6 is exported through conducting wire 3
Measurement data signals, conducting wire 3 are fixed through cork 2, to make entire sensor fix, and are added to externally threaded guide sleeve 1,
Fixing nut 4 and gasket 10 are added on guide sleeve 2.In relation to all resistance strain gages, material is Karma nickel chromium triangle high-resistance alloy,
Have many advantages, such as that the big range of linearity, high sensitivity and high temperature resistance are tired
Designed resistance strain gage, includes the circuit of two kinds of forms, is respectively used to test true deformation on sheet metal 7
Amount and temperature variation.Half-bridge circuit for accurately measuring true deformation as shown in Figure 2, is answered including identical resistance
Become piece R1, R2, be arranged in the position at the 1/4 of thin plate length direction and at 1/2, and with the fixed value resistance of similar resistance
R3, R4 form half-bridge circuit.After the resistance strain gage series connection, (temperature is certainly because the deformation quantity of temperature deformation is cancelled out each other for thin plate
Compensation), the voltage signal exported can indicate the true deformation quantity of thin plate through processing.
Half-bridge circuit for accurate temperature measurements variation as shown in Figure 3, including two resistance strain gage R5, R6 series connection
It is pasted onto at the 1/2 of thin plate length direction, three resistance strain gage R7, R8, R9 series connection are pasted on the 1/4 of thin plate length direction
Place, R5, R6, R7, R8, R9 are identical resistance strain gage；Two groups of concatenated foil gauges and the fixed value resistance of similar resistance form
Half-bridge circuit, the voltage signal U exported counteracts deformation variation can directly indicate the variable quantity of temperature after Conversion of measurement unit.
The arrangement of foil gauge R1, R2 on the sheet metal of the utility model electrometric sensor are as shown in figure 4, foil gauge
Automatic compensation is realized when R1, R2 work.When Fig. 2 bridges are temperature change, additional strain mutually supports caused by two foil gauges
Disappear；When Fig. 3 is thin plate deformation, thin plate deformation additional amount caused by two kinds of foil gauges is cancelled out each other.Concrete operating principle is to pacify
Loaded on the same resistance foil gauge R2 at the resistance strain gage R1 and 1/4 being affixed in cavity at 1/2 on thin plate, resistance value and definite value
Resistance R3, R4 are identical, and R1, R2, R3, R4 form equiarm half-bridge circuit respectively as bridge arm, are bridges when thin slice does not deform
Balance, voltage output zero, when thin plate deforms, due to the variation of foil gauge resistance value, circuit voltage drop changes, to search
Collecting voltage signal, and exported after enhanced processing.The strain stress that half-bridge circuit is exportedrIt is the strain stress of R11Subtract the strain of R2
εr, since the deformation that thin plate is affected by temperature generated R1, R2 is identical, to the strain stress of outputrAs thin plate deforms
Logarithmic strain.In addition, the single resistance-strain deformation quantity in midpoint is 3/2 times of single resistance deformation quantity at 1/4, therefore in thin plate
1/2 arrangement 2 identical resistance strain gage R5, R6, identical with R5 or R6 3 resistance-strains are arranged at the 3/4 of thin plate
Piece R7, R8, R9；R5, R6 series connection are used as a bridge arm, R7, R8, R9 series connection to be used as a bridge arm, with the resistance values such as R5, R6 bridge arm
Fixed value resistance as a bridge arm, form half-bridge circuit as a bridge arm with the fixed value resistance of the resistance values such as R7, R8, R9 bridge arm
Afterwards, resistance strain gage change in resistance caused by thin plate deformation is cancelled, and output pertains only to thin plate and is affected by temperature and generates
Signal, the signal can be used as temperature change output.
The electrometric sensor of the utility model is pasted the resistance strain gage of two kinds of bridges, has been come by the way that a thin plate is arranged
At the test job of two kinds of Small variables data of linear expansion coefficient, i.e. a sensor construction integrates two kinds of electric bridges, can test two
Kind small quantity signal, it is ensured that two kinds of signal synchronism outputs in use improve the precision of test data output.
Claims (10)
1. a kind of electrometric sensor for testing linear expansion coefficient, which is characterized in that including deformation plate, fixing device and two
The identical deformation foil gauge for measuring deformation；The deformation plate includes two edges in left and right, and the edge of the left and right two is equal
It is fixed in the fixing device；The leading flank of the deformation plate is used to incude the deformation of detected materials, and institute is posted on trailing flank
Deformation foil gauge is stated, a deformation foil gauge is affixed on the deformation plate from left hand edge to from the 1/2 of right hand edge distance, another shape
Become foil gauge and is affixed on the deformation plate from left hand edge to from the 1/4 of right hand edge distance or at 3/4；The 2 deformation foil gauge structure
At the deformation bridge circuit for measuring deformation, and it is located on different deformation electric bridge bridge arms.
2. a kind of electrometric sensor for testing linear expansion coefficient according to claim 1, which is characterized in that the shape
Become on the trailing flank of plate and also paste there are five thermometric foil gauge identical, for measuring temperature variation, three thermometrics strain
Piece is affixed on the deformation plate from left hand edge to from the 1/4 of right hand edge distance or at 3/4, and two thermometric foil gauges are affixed on described
For deformation plate from left hand edge to from the 1/2 of right hand edge distance, five thermometric foil gauges constitute the survey for measuring temperature variation
Warm bridge circuit, the thermometric foil gauge at thermometric foil gauge and described 1/4 or 3/4 at described 1/2 are serially connected with different respectively
In bridge for measuring temperature bridge arm.
3. a kind of electrometric sensor for testing linear expansion coefficient according to claim 2, which is characterized in that the shape
Become foil gauge and thermometric foil gauge as the resistance strain gage of Karma ni-Cd high-resistance alloy.
4. a kind of electrometric sensor for testing linear expansion coefficient according to claim 2, which is characterized in that the shape
Become bridge circuit and the bridge for measuring temperature circuit as half-bridge circuit.
5. a kind of electrometric sensor for testing linear expansion coefficient according to claim 1,2,3 or 4, feature exist
In the deformation plate left and right edges are embedded in the fixing device；It is additionally provided with backboard, the backboard both ends are also embedded in the fixation
Device forms cavity between the backboard and deformation plate trailing flank.
6. a kind of electrometric sensor for testing linear expansion coefficient according to claim 5, which is characterized in that the back of the body
Plate offers through-hole, and through-hole is equipped with hollow guide sleeve for wiring, extending far from deformation plate direction, connects institute
State deformation foil gauge, the outlet line of thermometric foil gauge is pierced by among the guide sleeve.
7. a kind of electrometric sensor for testing linear expansion coefficient according to claim 6, which is characterized in that described to lead
To putting on the fixation nut for being provided with external screw thread and matching with the external screw thread.
8. a kind of electrometric sensor for testing linear expansion coefficient according to claim 6, which is characterized in that described to lead
The plug of the fixed outlet line is provided with to the open end of set.
9. a kind of electrometric sensor for testing linear expansion coefficient according to claim 8, which is characterized in that the plug
Son is stopper.
10. a kind of electrometric sensor for testing linear expansion coefficient according to claim 5, which is characterized in that described
Fixing device is ceramic block, and the groove for being embedded in the backboard and deformation plate is provided on ceramic block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721730316.1U CN207798717U (en) | 2017-12-12 | 2017-12-12 | A kind of electrometric sensor for testing linear expansion coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721730316.1U CN207798717U (en) | 2017-12-12 | 2017-12-12 | A kind of electrometric sensor for testing linear expansion coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207798717U true CN207798717U (en) | 2018-08-31 |
Family
ID=63284111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721730316.1U Expired - Fee Related CN207798717U (en) | 2017-12-12 | 2017-12-12 | A kind of electrometric sensor for testing linear expansion coefficient |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199135A (en) * | 2021-11-26 | 2022-03-18 | 南京理工大学 | Device and method for measuring retreating amount of inner profile of throat insert and thickness of carbonized layer |
-
2017
- 2017-12-12 CN CN201721730316.1U patent/CN207798717U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199135A (en) * | 2021-11-26 | 2022-03-18 | 南京理工大学 | Device and method for measuring retreating amount of inner profile of throat insert and thickness of carbonized layer |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180831 Termination date: 20181212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |