CN105547132B - The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation - Google Patents
The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation Download PDFInfo
- Publication number
- CN105547132B CN105547132B CN201510883326.8A CN201510883326A CN105547132B CN 105547132 B CN105547132 B CN 105547132B CN 201510883326 A CN201510883326 A CN 201510883326A CN 105547132 B CN105547132 B CN 105547132B
- Authority
- CN
- China
- Prior art keywords
- sensitive
- sensitive grid
- grid
- segment
- cross
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 239000011888 foil Substances 0.000 claims description 36
- 239000002245 particle Substances 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 239000010425 asbestos Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 description 10
- 239000007769 metal material Substances 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000004069 differentiation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000035772 mutation Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement Of Force In General (AREA)
Abstract
A kind of sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation, including substrate and three sensitive grids being fixed thereon, each sensitive grid both ends respectively connect a pin, each sensitive grid includes sensitive segment and changeover portion, and the axis of all sensitive segments is straight line, is arranged in parallel and in approximately the same plane；Determined in sensitive segment axis in plane, be axially, with axially vertical direction for laterally along the sensitive segment axis direction；Three sensitive grid centers zero deflection in the axial direction, there is deviation in the horizontal；Three sensitive grids press the order of sensitive grid center, are transversely referred to as sensitive grid, middle sensitive grid and lower sensitive grid from top to bottom；The sensitive segment of upper sensitive grid, middle sensitive grid and lower sensitive grid all-in resistance changing value under identical strain is in 1：4：3 proportionate relationship.The present invention can measure the horizontal single order local derviation at lower sensitive grid center.
Description
Technical field
The present invention relates to sensor field, especially a kind of metal strain plate.
Background technology
The operation principle of metal resistance strain gauge is resistance strain effect, i.e. wire is in effect strained, its electricity
Resistance occurs to change accordingly with the size of mechanically deform occurred (stretching or compression).The theoretical formula of resistance strain effect
It is as follows:
Wherein R is its resistance value, and ρ is metal material resistivity, and L is metal material length, and S is metal material sectional area.
Wire is bearing to strain during mechanically deform occurs, and ρ, L, S three will change, so as to cause gold
Belong to the change of material resistance value.When metal material is stretched, length increase, sectional area reduces, resistance value increase；When compressed
When, length reduces, and sectional area increase, resistance value reduces.Therefore, as long as the change of resistance value can be measured, wire can be known
Strained situation.Metal material resistance change rate formula can be exported by relevant knowledges such as formula (1) and the mechanics of materials：
Wherein Δ R is resistance variation amount, and Δ L is the change of metal material length on pulling force or pressure action direction
Amount, ε are that the strain in same direction is usually referred to as axial strain, and K is metal material ga(u)ge factor.
In actual applications, metal resistance strain gauge is pasted onto to the table of Sensor Elastic Element or tested machine components
Face.When the flexible member in sensor or tested machine components are produced strain by active force, foil gauge thereon is pasted onto
Identical mechanically deform occurs therewith, causes strain sheet resistance that corresponding change occurs.At this moment, resistance strain gage is just by mechanical quantity
Be converted to the variable quantity output of resistance.
But we are also required to understand the partial derivative of workpiece strain sometimes, for example there are three kinds of occasions, but not limited to this below
Three, it is necessary to use workpiece surface strain partial derivative：
First, due to nearby occurring that strain is concentrated, and often occurs damaging it first as workpiece at workpiece shapes mutation
Place, the strain partial derivative near at shape mutation is monitored, can intuitively obtain strain intensity at this.
Second, largely existed by comer pieces in building, bridge, plant equipment, the relevant knowledge of the mechanics of materials is taught that, bending
The axial strain of beam surface is directly proportional to section turn moment, and the axial first-order partial derivative of section turn moment is directly proportional to section shearing strain,
Exactly section shearing strain can be known by the axial first-order partial derivative of surface axial strain, and the shearing strain can not use foil gauge
Arrived in workpiece surface direct measurement；
3rd, when applied elasticity research workpiece strains, internal strain is decided by partial differential equation, and equation solution needs
Boundary condition, and workpiece surface strain partial derivative is exactly one of boundary condition, this is that general foil gauge can not provide.
In addition, to some positions of workpiece, such as the position such as at the shaft shoulder, part edge, due to the mutation of geomery, its
Bigger change often accordingly be present in strain.However, just due to the mutation of geomery so that more difficult placement in general at this
Foil gauge is, it is necessary to the product of a kind of inclined marginal position of energy measuring strain piece rather than center position strain local derviation.
The content of the invention
In order to overcome the shortcomings of that existing metal strain plate can not detect strain local derviation, the present invention provides one kind and can measured
The cross direction profiles three that the measurable biasing sensitive grid central cross local derviation of energy effective detection surface strain transverse direction local derviation should be changed are quick
Feel grid metal foil gauge, particularly measuring workpiece corner, edge etc. has the horizontal single order local derviation of size restriction site to foil gauge.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation, including base
Bottom, the metal strain plate also include three sensitive grids, and the both ends of each sensitive grid connect a pin respectively, in the substrate
Fixed three sensitive grids；
Each sensitive grid includes sensitive segment and changeover portion, and the both ends of the sensitive segment are changeover portion, and the sensitive segment is in thin
Strip, the changeover portion are in tubbiness shape, and the resistance of the sensitive segment is much larger than the resistance of the changeover portion, same strain state
Under the increased resistance value of the sensitive segment be much larger than the increased resistance value of the changeover portion, the increased resistance value of the changeover portion connects
It is bordering on 0；
All cross section centres of form of each sensitive segment form sensitive segment axis, and the sensitive segment axis is straight line section, institute
In stating the diameter parallel of each sensitive segment in three sensitive grids and being generally aligned in the same plane, sensitive segment axis is determined in plane, edge
The sensitive segment axis direction is axially, with axially vertical direction for laterally；Its both sides resistance value be present on each sensitive segment
An equal cross section, take the cross-section centroid position and formed place sensitive segment by nominal mass of the sensitive segment resistance value
Nominal particle, the centroid position that the nominal particle of each sensitive segment is collectively forming are the center of sensitive grid；
Three sensitive grid centers zero deflection in the axial direction, there is deviation in the horizontal；Three sensitive grids press sensitive grid centre bit
The order put, sensitive grid, middle sensitive grid and lower sensitive grid are transversely referred to as from top to bottom；Upper sensitive grid center is quick with
The distance for feeling grid center is Δ y1, the distance at middle sensitive grid center and lower sensitive grid center is Δ y1, among any two sensitive grid
The high person in sensitive grid central cross position, the lateral attitude of every bit is higher than any sensitive segment of another sensitive grid on its each sensitive segment
The lateral attitude of upper any point；
The sensitive segment all-in resistance of upper sensitive grid, middle sensitive grid and lower sensitive grid is in 1：4：3 proportionate relationship, upper sensitive grid,
The all-in resistance changing value of the sensitive segment of middle sensitive grid and lower sensitive grid sensitive segment under identical strain is also in 1：4：3 ratio is closed
System.
Further, all shape of cross section sizes of each sensitive segment are consistent, take the axis point midway of each sensitive segment
And using the sensitive segment resistance value as nominal mass formed where sensitive segment nominal particle, the upper sensitive grid, middle sensitive grid and
The sensitive segment total length of lower sensitive grid is in 1：4：3 proportionate relationship.The program is a kind of scheme that can be selected, nominal particle
As long as position meet the equal cross section position of form center of its both sides resistance value can or other positions.
Further, the lateral separation very little of the lower edge of the pin of lower sensitive grid and lower sensitive grid bottom sensitive segment or
Even pin lower edge is located at the top of lower sensitive grid bottom sensitive segment.Purpose is to reduce lower sensitive grid center to foil gauge downside
The distance at edge.
Using the linear relationship between metal material increased resistance value and strain, this foil gauge is as common foil gauge
It can be used for measuring strain.On the other hand, according in numerical differentiation theory, (such as Yi Fengkang is compiled, National Defense Industry Press 1978
December in year publishes《Numerical computation method》Page 21 (1.4.11)-(1.4.14) formulas make equidistant interpolation analysis) on single order local derviation
Circular, the numerical computation method of f (x, y) y directions first-order partial derivative is as follows：
Wherein y1=y0+ h, y2=y1+ h, it is (x, y to pay special attention to above formula2) position first-order partial derivative value formula, the formula
Smaller truncated error is o (h2) be step-length square higher order indefinite small.By being generally acknowledged that sensitive gate resistance in formula (2) engineering
Variable quantity direct ratio and the strain at sensitive grid center, with reference to each sensitive gate resistance and the ratio of the resistance change under same strain
The resistance of example relation, upper sensitive grid and lower sensitive grid and the resistance value for subtracting middle sensitive grid, then except above sensitive grid center is with
The distance at sensitive grid center is the horizontal single order local derviation of strain, and particularly, according to numerical differentiation theory, this is lower sensitive grid center
The horizontal single order numerical value local derviation of position, rather than the horizontal single order local derviation in the middle part of foil gauge, therefore the advantage of the foil gauge is
The horizontal single order local derviation at the position that the general foil gauge such as measurement workpiece corner, edge can not be measured due to size limitation.
It should be noted that sensitive grid, middle sensitive grid and lower sensitive grid changeover portion all-in resistance and changeover portion are electric on keeping in technique
It is in 1 to hinder the variable quantity under external strain：4：3 numerical relation to heighten measurement accuracy, if the resistance of changeover portion and should
Become lower resistance change can not ignore, also systematic error can be used as to be eliminated in detection.
Further, the metal strain plate also includes cover plate, and the cover plate is covered in the sensitive grid and substrate.
Further, the sensitive grid is wire form, foil, diaphragm type or thick-film type sensitive grid.
Further, the substrate is glued membrane substrate, glass fabric substrates, asbestos base bottom, metallic substrates or temporary substrate.
Three sensitive grid upper, middle and lower are arranged in substrate.It is of course also possible to it is other arrangements.
Beneficial effects of the present invention are mainly manifested in：The horizontal single order numerical value of sensitive grid center is inclined under energy effective detection
Lead, particularly measuring workpiece corner, edge etc. has the horizontal single order local derviation of size restriction site to foil gauge.
Brief description of the drawings
Fig. 1 is the signal of the sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation
Figure.
Fig. 2 is the sensitive grid metal strain plate top view of cross direction profiles three of measurable biasing sensitive grid central cross local derviation.
Fig. 3 is measuring bridge schematic diagram.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
1~Fig. 3 of reference picture, a kind of three sensitive grid metal of cross direction profiles of measurable biasing sensitive grid central cross local derviation should
Become piece, including substrate, the metal strain plate also include three sensitive grids, the both ends of each sensitive grid connect one and drawn respectively
Pin, three sensitive grids are fixed in the substrate；
Each sensitive grid includes sensitive segment and changeover portion, and the both ends of the sensitive segment are changeover portion, and the sensitive segment is in thin
Strip, the changeover portion are in tubbiness shape, and the resistance of the sensitive segment is much larger than the resistance of the changeover portion, same strain state
Under the increased resistance value of the sensitive segment be much larger than the increased resistance value of the changeover portion, the increased resistance value of the changeover portion connects
It is bordering on 0；
All cross section centres of form of each sensitive segment form sensitive segment axis, and the sensitive segment axis is straight line section, institute
In stating the diameter parallel of each sensitive segment in three sensitive grids and being generally aligned in the same plane, sensitive segment axis is determined in plane, edge
The sensitive segment axis direction is axially, with axially vertical direction for laterally；Its both sides resistance value be present on each sensitive segment
An equal cross section, take the cross-section centroid position and formed place sensitive segment by nominal mass of the sensitive segment resistance value
Nominal particle, the centroid position that the nominal particle of each sensitive segment is collectively forming are the center of sensitive grid；
Three sensitive grid centers zero deflection in the axial direction, there is deviation in the horizontal；Three sensitive grids press sensitive grid centre bit
The order put, sensitive grid, middle sensitive grid and lower sensitive grid are transversely referred to as from top to bottom；Upper sensitive grid center is quick with
The distance for feeling grid center is Δ y1, the distance at middle sensitive grid center and lower sensitive grid center is Δ y1, among any two sensitive grid
The high person in sensitive grid central cross position, the lateral attitude of every bit is higher than any sensitive segment of another sensitive grid on its each sensitive segment
The lateral attitude of upper any point；
The sensitive segment all-in resistance of upper sensitive grid, middle sensitive grid and lower sensitive grid is in 1：4：3 proportionate relationship, upper sensitive grid,
The all-in resistance changing value of the sensitive segment of middle sensitive grid and lower sensitive grid sensitive segment under identical strain is also in 1：4：3 ratio is closed
System.
Further, all shape of cross section sizes of each sensitive segment are consistent, take the axis point midway of each sensitive segment
And using the sensitive segment resistance value as nominal mass formed where sensitive segment nominal particle, the upper sensitive grid, middle sensitive grid and
The sensitive segment total length of lower sensitive grid is in 1：4：3 proportionate relationship.The program is a kind of scheme that can be selected, nominal particle
As long as position meet the equal cross section position of form center of its both sides resistance value can or other positions.
Further, the lateral separation very little of the lower edge of the pin of lower sensitive grid and lower sensitive grid bottom sensitive segment or
Even pin lower edge is located at the top of lower sensitive grid bottom sensitive segment.Purpose is to reduce lower sensitive grid center to foil gauge downside
The distance at edge.
The sensitive grid metal strain plate of cross direction profiles three of the measurable biasing sensitive grid central cross local derviation of the present embodiment, bag
Substrate 1 is included, the metal strain plate also includes three sensitive grids, and the both ends of each sensitive grid connect a pin respectively, described
Three sensitive grids are fixed in substrate 1.
Sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 can be fixed on substrate 1, for keeping each sensitive grid fixation
Shape, positions and dimensions；Substrate 1 is very thin, so as to which the strain of surface of test piece is accurately transfer into upper sensitive grid 2, middle sensitive grid 3
With lower sensitive grid 4.Substrate 1 can be glued membrane substrate, glass fabric substrates, asbestos base bottom, metallic substrates and temporary substrate.Generally
With cohere, weld, substrate is fixed on the tested position of test block by the mode such as ceramic spraying.Some use can be also printed in substrate 1
In the lines of foil gauge positioning.
Cover plate is made of materials such as paper or glue, is covered in sensitive grid 2, middle sensitive grid 3, lower sensitive grid 4 and substrate 1
On, play the protective layer of protection against the tide, corrosion protection, loss prevention etc..
Pin 5 is used to connect sensitive grid and measuring circuit, and upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 respectively have two
Pin 5, pair with foil and membrane type foil gauge, upper sensitive grid 2, middle sensitive grid 3 and the lower sensitive grid 4 that pin 5 is connected with it
It is integrated.Two pins of upper sensitive grid 2 are 5-1 and 5-2, and two pins of middle sensitive grid 3 are 5-3 and 5-4, lower sensitive grid 4
Two pins be 5-5 and 5-6, the lateral separation very little of pin 5-5 and 5-6 lower edge and the lower bottom sensitive segment of sensitive grid 4
Or even the two pins lower edge is located at the top of the lower bottom sensitive segment of sensitive grid 4, it is therefore an objective to reduces the lower center of sensitive grid 4 and arrives
The distance of foil gauge lower edge.
Upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4, can be with according to its metal sensitive material and the difference of processing technology
For wire form, foil, diaphragm type, thick-film type.No matter the equal very little of thickness of which kind of upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4,
So that the axial length of upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 depends on the deformation of workpiece with it and changed.The present invention
It is basic it is critical that cooperation between upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4, there is following main points：
First, three sensitive grids are arranged in substrate, are referred to as sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4.
Second, upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 can be divided into sensitive segment 6 and changeover portion 7, each changeover portion 7
The connection of each sensitive segment 6 is formed into sensitive grid.Comparatively, sensitive segment 6 is elongated in shape, resistance is larger and its resistance to strain compared with
For sensitivity；The changeover portion 7 is in tubbiness shape substantially so that the resistance very little of the changeover portion and, work insensitive to straining
Resistance variations are close to 0 under state, therefore the summation of sensitive segment resistance is essentially the all-in resistance of single sensitive grid.Fig. 2 is from more clear
Clear angle has marked sensitive segment 6 and changeover portion 7 in more detail.
3rd, the sensitive segment 6 of each sensitive grid is in elongated strip, and all cross section centres of form composition of each sensitive segment 6 is quick
Feel section axis, the axis of sensitive segment 6 is straight line section, the diameter parallel of each sensitive segment 6 and is generally aligned in the same plane.Each
Projection of shape of all cross sections of sensitive segment 6 along sensitive segment axis direction is consistent.Take the axis point midway of each sensitive segment
And the nominal particle of place sensitive segment is formed using the sensitive segment resistance value as nominal mass, the nominal particle of each sensitive segment is common
The centroid position of formation is the center of sensitive grid.
4th, the total length of sensitive segment 6 of upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 is in 1：4：3 proportionate relationship,
The all-in resistance of sensitive segment 6 of upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 is in 1：4：3 proportionate relationship, upper sensitive grid 2, in it is quick
The all-in resistance changing value for feeling the sensitive segment under identical strain of sensitive segment 6 of grid 3 and lower sensitive grid 4 is also in 1：4：3 ratio is closed
System.
5th, sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 in vertical view, they are respectively provided with symmetry axis and symmetrical overlapping of axles
(y-axis in Fig. 2), upper sensitive grid 2, middle sensitive grid 3 and the respective sensitive segment 6 of lower sensitive grid 4 are all vertical with the symmetry axis, and
And the sensitive segment 6 of each sensitive grid is distributed on this axial symmetry.Therefore, it can be said that upper sensitive grid 2, middle sensitive grid 3 and lower sensitivity
On the y axis, there is lateral deviation at their center to the center of grid 4 without axial deviation.According to the top view of foil gauge in Fig. 2,
The sensitive segment 6 of upper sensitive grid 2 has axially symmetric axle xU, the center of upper sensitive grid 2 is in y-axis and xUThe intersection point of axle, middle sensitive grid 3
Sensitive segment 6 has axially symmetric axle xM, the center of middle sensitive grid 3 is in y-axis and xMThe intersection point of axle, the sensitive segment 6 of lower sensitive grid 4 have axle
To symmetry axis xL, the center of lower sensitive grid 4 is in y-axis and xLThe intersection point of axle.
6th, the distance at upper sensitive grid center and middle sensitive grid center is Δ y1, in middle sensitive grid center and lower sensitive grid
The distance of the heart is Δ y1, i.e., the line midpoint at the center and the center of lower sensitive grid 4 of upper sensitive grid 2 is also y-axis and xMThe friendship of axle
Point, as shown in Figure 2.The forward direction of y-axis as shown in Figure 2, the y-coordinate of arbitrfary point is quick in being more than on any sensitive segment 6 of upper sensitive grid 2
Feel grid 3 any sensitive segment 6 on arbitrfary point y-coordinate, the y-coordinate of arbitrfary point is more than on any sensitive segment 6 of middle sensitive grid 3
Lower sensitive grid 4 any sensitive segment 6 on arbitrfary point y-coordinate.Due to upper sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4
Relative position is ensured relatively accurately to be secured by foil gauge production technology, and this is also that the present invention can detect workpiece strain laterally
One of key of partial derivative.
In summary, sensitive grid 2, middle sensitive grid 3 and lower sensitive grid 4 increased resistance value under same strain are in the present invention
1：4：3 proportionate relationship, each central axial zero deflection of sensitive grid laterally have deviation, the center of upper sensitive grid 2 to the middle center of sensitive grid 3
Distance it is equal with the distance of the middle center of sensitive grid 3 to lower sensitive grid 4.
It is R to make the upper resistance of sensitive grid 2 under free stateU0, the middle resistance of sensitive grid 3 is RM0, the lower resistance of sensitive grid 4 is RL0, should
There is RU0+RL0=RM0=R0.When the foil gauge of the present invention is placed in into certain surface strain, the upper resistance of sensitive grid 2 is R0+ΔRU,
The middle resistance of sensitive grid 3 is R0+ΔRM, the lower resistance of sensitive grid 4 is R0+ΔRL；On the other hand, upper sensitive grid 2 and lower sensitive grid 4
Center respectively be located at Fig. 2 in y-axis and xUIntersection point and y-axis and xLIntersection point, at a distance of 2 Δ y in transverse direction1.Utilize sensitive grid electricity
Resistance has with the relation of surface strain and the formula (3) of numerical differentiation：
WhereinFor the center of lower sensitive grid 4, εUFor the strain at the upper center of sensitive grid 2, εMFor in middle sensitive grid 3
Strain at the heart, εLFor the strain at the lower center of sensitive grid 4.This is the original that the present embodiment measurement surface strains horizontal local derviation
Reason.Pay special attention to, the numerical differentiation that above formula is calculated for lower sensitive grid 4 center strain transverse direction single order local derviation, the position
The downside of foil gauge is set to, therefore has and is easy to measurement workpiece corner, edge etc. to have size restriction site to foil gauge
The advantage of horizontal single order local derviation.With reference to Fig. 2, the pin 5-5 and 5-6 of lower sensitive grid 4 lower edge are sensitive with lower sensitive grid bottom
Section lateral separation very little or even pin lower edge is located at the top of lower sensitive grid bottom sensitive segment, it is therefore an objective to it is quick under reduction
Grid center is felt to the distance of foil gauge lower edge, in order to further play above-mentioned advantage.
Electric bridge is coordinated to can be used for measuring strain, strain horizontal single order local derviation the present embodiment, it is assumed that bridge input voltage is
ui, output voltage uo, the schematic diagram of measuring bridge is shown in Fig. 3.When without workpiece effects of strain, each arm resistance of electric bridge is according to up time
Pin direction is respectively labeled as R1、R2、R3、R4, in the also electric bridge where these sign flag resistance in the case of will not obscuring.Often
The sensitive grid or resistance of foil gauge can be laid on individual electric bridge.It is identical with general foil gauge arrangement, if in multiple bridge arms
Upper placement sensitive grid, the requirement of order, strain difinite quality to each installation position.During without workpiece effects of strain, the output of electric bridge
Voltage equation is
Now, it is desirable to bridge balance i.e. uo=0, then it must is fulfilled for so-called bridge balance condition R1R3-R2R4=0,
The electric bridge of use further meets
R1=R2=R3=R4, (6)
Since first, when meeting condition (6), according to relevant theoretical foil gauge sensitivity highest；Second, measuring strain or
The method that person strains horizontal local derviation is required to condition (6) establishment.When foil gauge also strains with external world's strain, above-mentioned electric bridge
Equilibrium condition is typically no longer set up, now
Due to Δ Ri＜ ＜ RiFirst ≈ of (i=1,2,3,4) event is set up, and second ≈ works as Δ R1-ΔR2With Δ R3-ΔR4
Jack per line or contrary sign but | Δ R1-ΔR2| with | Δ R3-ΔR4| not in close proximity to when set up, the reasonable selection foil gauge in engineering
Installation position can be realized completely.It is generally available the voltage measurement strain of formula (7) acquisition；Can convolution to straining horizontal local derviation
(4) and formula (7), reasonable design arrange each bridge arm sensitive grid and resistance, such as bridge arm R1Sensitive grid 3 in arrangement, bridge arm R2Series connection
Sensitive grid 2 and lower sensitive grid 4 in arrangement, remaining bridge arm configuration substitutional resistance, can be obtained with being strained laterally at the lower center of sensitive grid 4
The linear magnitude of voltage u of single order local derviationo, the voltage is that small-signal need to be amplified.
Claims (6)
1. a kind of sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation, including substrate,
It is characterized in that：The metal strain plate also includes three sensitive grids, and the both ends of each sensitive grid connect a pin, institute respectively
State and three sensitive grids are fixed in substrate；
Each sensitive grid includes sensitive segment and changeover portion, and the both ends of the sensitive segment are changeover portion, and the sensitive segment is in elongate strip
Shape, the changeover portion are in tubbiness shape, and the resistance of the sensitive segment is much larger than the resistance of the changeover portion, institute under same strain state
The increased resistance value for stating sensitive segment is much larger than the increased resistance value of the changeover portion, the increased resistance value of the changeover portion close to
0；
All cross section centres of form of each sensitive segment form sensitive segment axis, and the sensitive segment axis is straight line section, and described three
The diameter parallel of each sensitive segment and it is generally aligned in the same plane in individual sensitive grid, sensitive segment axis determined in plane, along described
Sensitive segment axis direction is axially, with axially vertical direction for laterally；It is equal to there is its both sides resistance value on each sensitive segment
A cross section, take the cross-section centroid position and using the sensitive segment resistance value as nominal mass formed where sensitive segment name
Particle, the centroid position that the nominal particle of each sensitive segment is collectively forming are the center of sensitive grid；
Three sensitive grid centers zero deflection in the axial direction, there is deviation in the horizontal；Three sensitive grids are centrally located at straight line
On, the straight line is parallel with the horizontal direction, three sensitive grids along this rectilinear direction be referred to as from top to bottom upper sensitive grid, in
Sensitive grid and lower sensitive grid；The distance at upper sensitive grid center and middle sensitive grid center is Δ y1, middle sensitive grid center and lower sensitivity
The distance at grid center is Δ y1, the high person in sensitive grid central cross position among any two sensitive grid is every on its each sensitive segment
Lateral attitude of the lateral attitude of any higher than any point on any sensitive segment of another sensitive grid；
The sensitive segment all-in resistance of upper sensitive grid, middle sensitive grid and lower sensitive grid is in 1：4：3 proportionate relationship, upper sensitive grid, in it is quick
The all-in resistance changing value for feeling sensitive segment sensitive segment under identical strain of grid and lower sensitive grid is also in 1：4：3 proportionate relationship.
2. the sensitive grid metal strain of cross direction profiles three of measurable biasing sensitive grid central cross local derviation as claimed in claim 1
Piece, it is characterised in that：All shape of cross section sizes of each sensitive segment are consistent, take the axis point midway of each sensitive segment simultaneously
Using the sensitive segment resistance value as nominal mass formed where sensitive segment nominal particle, the upper sensitive grid, middle sensitive grid and under
The sensitive segment total length of sensitive grid is in 1：4：3 proportionate relationship.
3. the three sensitive grid metal of cross direction profiles of measurable biasing sensitive grid central cross local derviation as claimed in claim 1 or 2
Foil gauge, it is characterised in that：The lower edge of the pin of the lower sensitive grid is located at the top of lower sensitive grid bottom sensitive segment.
4. the three sensitive grid metal of cross direction profiles of measurable biasing sensitive grid central cross local derviation as claimed in claim 1 or 2
Foil gauge, it is characterised in that：The metal strain plate also includes cover plate, and the cover plate is covered in the sensitive grid and substrate.
5. the three sensitive grid metal of cross direction profiles of measurable biasing sensitive grid central cross local derviation as claimed in claim 1 or 2
Foil gauge, it is characterised in that：The sensitive grid is wire form, foil, diaphragm type or thick-film type sensitive grid.
6. the three sensitive grid metal of cross direction profiles of measurable biasing sensitive grid central cross local derviation as claimed in claim 1 or 2
Foil gauge, it is characterised in that：The substrate is glued membrane substrate, glass fabric substrates, asbestos base bottom or metallic substrates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510883326.8A CN105547132B (en) | 2015-12-04 | 2015-12-04 | The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510883326.8A CN105547132B (en) | 2015-12-04 | 2015-12-04 | The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105547132A CN105547132A (en) | 2016-05-04 |
| CN105547132B true CN105547132B (en) | 2017-12-29 |
Family
ID=55826497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510883326.8A Active CN105547132B (en) | 2015-12-04 | 2015-12-04 | The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105547132B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595394A (en) * | 2020-12-07 | 2021-04-02 | 锐马（福建）电气制造有限公司 | Tangential arc strain gauge, radial strain gauge and supporting leg weighing sensor |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1460398A1 (en) * | 2003-03-07 | 2004-09-22 | Hottinger Baldwin Messtechnik Gmbh | Strain sensor with resistive and piezoelectric strain-sensitive elements |
| DE102004030382A1 (en) * | 2004-06-23 | 2006-02-02 | Eads Deutschland Gmbh | Strain-measuring method for measuring transverse strain in semiconductor material uses piezoresistive resistors sensitive to transverse and normal strains |
| CN102095362A (en) * | 2010-11-20 | 2011-06-15 | 武汉理工大学 | Grid-type carbon fiber strain transducer |
| CN202329533U (en) * | 2011-08-09 | 2012-07-11 | 浙江大合建设工程检测有限公司 | Strain gauge |
| CN104913985A (en) * | 2015-05-27 | 2015-09-16 | 河海大学 | Determination apparatus and determination method for concrete impact flexural-tensile injury based on non-equilibrium state |
| CN105004262A (en) * | 2015-08-13 | 2015-10-28 | 浙江工业大学 | Lateral deviation full-bridge double-interdigital metal strain gauge capable of measuring surface strain lateral partial derivatives |
| CN105066871A (en) * | 2015-08-13 | 2015-11-18 | 浙江工业大学 | Axial deviation full-bridge full-interdigital metal strain sheet capable of measuring surface strain axial partial derivative |
| CN105066870A (en) * | 2015-08-13 | 2015-11-18 | 浙江工业大学 | Axial deviation full-bridge double-interdigital metal strain sheet capable of measuring surface strain axial partial derivative |
| CN105091731A (en) * | 2015-08-13 | 2015-11-25 | 浙江工业大学 | Axial deviation double-sensitive grid interdigital metal strain plate capable of measuring axial deviation of surface strain |
| CN105091730A (en) * | 2015-07-03 | 2015-11-25 | 新会康宇测控仪器仪表工程有限公司 | DSOI (Double Silicon Oxide Insulation) strain gage and manufacturing method thereof |
-
2015
- 2015-12-04 CN CN201510883326.8A patent/CN105547132B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1460398A1 (en) * | 2003-03-07 | 2004-09-22 | Hottinger Baldwin Messtechnik Gmbh | Strain sensor with resistive and piezoelectric strain-sensitive elements |
| DE102004030382A1 (en) * | 2004-06-23 | 2006-02-02 | Eads Deutschland Gmbh | Strain-measuring method for measuring transverse strain in semiconductor material uses piezoresistive resistors sensitive to transverse and normal strains |
| CN102095362A (en) * | 2010-11-20 | 2011-06-15 | 武汉理工大学 | Grid-type carbon fiber strain transducer |
| CN202329533U (en) * | 2011-08-09 | 2012-07-11 | 浙江大合建设工程检测有限公司 | Strain gauge |
| CN104913985A (en) * | 2015-05-27 | 2015-09-16 | 河海大学 | Determination apparatus and determination method for concrete impact flexural-tensile injury based on non-equilibrium state |
| CN105091730A (en) * | 2015-07-03 | 2015-11-25 | 新会康宇测控仪器仪表工程有限公司 | DSOI (Double Silicon Oxide Insulation) strain gage and manufacturing method thereof |
| CN105004262A (en) * | 2015-08-13 | 2015-10-28 | 浙江工业大学 | Lateral deviation full-bridge double-interdigital metal strain gauge capable of measuring surface strain lateral partial derivatives |
| CN105066871A (en) * | 2015-08-13 | 2015-11-18 | 浙江工业大学 | Axial deviation full-bridge full-interdigital metal strain sheet capable of measuring surface strain axial partial derivative |
| CN105066870A (en) * | 2015-08-13 | 2015-11-18 | 浙江工业大学 | Axial deviation full-bridge double-interdigital metal strain sheet capable of measuring surface strain axial partial derivative |
| CN105091731A (en) * | 2015-08-13 | 2015-11-25 | 浙江工业大学 | Axial deviation double-sensitive grid interdigital metal strain plate capable of measuring axial deviation of surface strain |
Non-Patent Citations (1)
| Title |
|---|
| 应变片敏感栅结构参数对测量精度的影响;胡玉梅等;《重庆大学学报》;20131231;第36卷(第12期);第21-27页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105547132A (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105091731B (en) | The axial deviation sensitive grid interdigitated metal foil gauge of the axial local derviation of measurable surface strain | |
| CN105444662B (en) | The sensitive grid full-bridge of axial deviation six of axial local derviation mixes interdigital metal strain plate outside measurable bilateral piece | |
| CN105066871B (en) | The full interdigitated metal foil gauge of axial deviation full-bridge of the axial local derviation of measurable surface strain | |
| CN105004262B (en) | The double interdigitated metal foil gauges of lateral deviation full-bridge of the horizontal local derviation of measurable surface strain | |
| CN105066870B (en) | The double interdigitated metal foil gauges of axial deviation full-bridge of the axial local derviation of measurable surface strain | |
| CN105865321B (en) | It can measure the interdigital metal strain plate of three sensitive grid of axial deviation of axial local derviation on the outside of biasing sensitive grid | |
| CN105547132B (en) | The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid central cross local derviation | |
| CN105423895B (en) | The interdigital metal strain plate of the sensitive grid of lateral deviation three of horizontal local derviation outside measurable | |
| CN105318828B (en) | The three sensitive grid metal strain plates of axial direction distribution of axial local derviation outside measurable | |
| CN105423899B (en) | The three sensitive grid metal strain plates of axial distribution of axial local derviation on the outside of measurable biasing sensitive grid | |
| CN105371747B (en) | The sensitive grid full-bridge metal strain plate of cross direction profiles six of horizontal local derviation outside measurable bilateral piece | |
| CN105588510B (en) | Axial direction distribution six sensitive grid full-bridges, the three interdigital metal strain plate of axial local derviation outside measurable bilateral piece | |
| CN105486217B (en) | Six sensitive grid full-bridge of cross direction profiles, the three interdigital metal strain plate of measurable unilateral double offset sensitive grid local derviation laterally outside | |
| CN105466330B (en) | The sensitive grid metal strain plate of cross direction profiles three of measurable biasing sensitive grid local derviation laterally outside | |
| CN105509632B (en) | It can measure the five interdigital metal strain plate in sensitive grid side of cross direction profiles of bilateral biasing sensitive grid local derviation laterally outside | |
| CN105352431B (en) | Close interdigital metal strain plate in the sensitive grid of cross direction profiles five of horizontal local derviation outside measurable unilateral piece | |
| CN105387799B (en) | The sensitive grid metal strain plate of cross direction profiles three of horizontal local derviation outside measurable | |
| CN105547134B (en) | The interdigital metal strain plate of three sensitive grid of lateral deviation of measurable biasing sensitive grid local derviation laterally outside | |
| CN105547137B (en) | The interdigital metal strain plate of three sensitive grid of lateral deviation of measurable biasing sensitive grid central cross local derviation | |
| CN105547135B (en) | The interdigital metal strain plate of the sensitive grid of axial deviation three of measurable offset position axial direction local derviation | |
| CN105318830B (en) | The sensitive grid full-bridge of lateral deviation six mixes interdigital metal strain plate | |
| CN105423898B (en) | The five interdigital metal strain plates in sensitive grid side of axial direction distribution of axial local derviation outside measurable bilateral piece | |
| CN105423896B (en) | The sensitive grid full-bridge of lateral deviation six of horizontal local derviation mixes interdigital metal strain plate outside measurable bilateral piece | |
| CN105466331B (en) | The sensitive grid full-bridge metal strain plate of cross direction profiles six of measurable bilateral biasing sensitive grid local derviation laterally outside | |
| CN105423907B (en) | Six sensitive grid full-bridge of cross direction profiles, the three interdigital metal strain plate of measurable unilateral double offset sensitive grid central cross local derviation |
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 | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200804 Address after: 510000 unit 2414-2416, building, No. five, No. 371, Tianhe District, Guangdong, China Patentee after: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Address before: The city Zhaohui six districts Chao Wang Road Hangzhou city Zhejiang province Zhejiang University of Technology No. 18 310014 Patentee before: ZHEJIANG University OF TECHNOLOGY Effective date of registration: 20200804 Address after: 221300 Tushan street, Tushan Town, Pizhou City, Xuzhou City, Jiangsu Province Patentee after: Pizhou Huiteng Jingfa Construction Co.,Ltd. Address before: 510000 unit 2414-2416, building, No. five, No. 371, Tianhe District, Guangdong, China Patentee before: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. |