CN206862532U - A kind of body strain dynamic characteristic measuring instrument - Google Patents
A kind of body strain dynamic characteristic measuring instrument Download PDFInfo
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- CN206862532U CN206862532U CN201720472246.8U CN201720472246U CN206862532U CN 206862532 U CN206862532 U CN 206862532U CN 201720472246 U CN201720472246 U CN 201720472246U CN 206862532 U CN206862532 U CN 206862532U
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- body strain
- insulation
- sensor
- dynamic characteristic
- measuring instrument
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Abstract
The utility model discloses a kind of body strain dynamic characteristic measuring instrument, including sealing thermal insulation cavity, extraction gas port, pressure sensor, baroceptor and body strain sensor, wherein, the extraction gas port is arranged on sealing thermal insulation cavity, body strain sensor is arranged at sealing thermal insulation inside cavity, and the pressure sensor and baroceptor are respectively arranged on sealing thermal insulation cavity and respective sensor probe is placed in sealing thermal insulation cavity.Body strain dynamic characteristic measuring instrument provided by the utility model is on the basis of body strain sensor construction is analyzed, the transmission function of sensor can be obtained according to the input and output collection signal fitting of test system, obtain the dynamic characteristic of body strain sensor, solve the situation being short in understanding to body strain sensor, provided the foundation condition in dynamic application for the sensor data.
Description
Technical field
It the utility model is related to technical field of measuring equipment, more particularly to a kind of body strain dynamic characteristic measuring instrument.
Background technology
Body strain measuring instrument is the high sensitivity instrument for measuring crustal rock strain variation, is Borehole strain observation
Using one of wide instrument.Body strain measuring instrument can record with seismic wave and its vibration signal is shaken, at present well
The country has started to carry out the research of this aspect with shake record using body strain.Clearly solid can be recorded by the measuring instrument
Tide signal and other vibration signals.But because the dynamic characteristic at present for body strain sensor lacks corresponding parameter,
That is the understanding of the dynamic characteristic (i.e. transmission function) of body strain sensor is remained in blank so that is carrying out body strain signal to dynamic
The research process of state signal, limit the further research application of Dynamic Signal.
The content of the invention
The purpose of this utility model is to provide a kind of body strain dynamic characteristic measuring instrument, so as to obtain strain sensing
The dynamic characteristic of device.
The purpose of this utility model is achieved through the following technical solutions：
A kind of body strain dynamic characteristic measuring instrument, including sealing thermal insulation cavity, extraction gas port, pressure sensor and body should
Become sensor, wherein, the extraction gas port is arranged on sealing thermal insulation cavity, and body strain sensor is arranged at sealing thermal insulation cavity
Inside, the pressure sensor is respectively arranged on sealing thermal insulation cavity and respective sensor probe is placed in sealing thermal insulation cavity
It is interior.
The sealing thermal insulation cavity includes insulation cover, insulation inner cylinder and insulation outer barrel, the insulation inner cylinder and insulation outer barrel
Between be vacuum interlayer, and be provided with bleeding point on the insulation outer barrel, the insulation cover be installed on the insulation inner cylinder and
The incubation cavity that a sealing is formed in the sealing thermal insulation cavity is made on insulation outer barrel.
The insulation inner cylinder is respectively that stainless steel insulation inner cylinder and stainless steel are incubated outer barrel, the insulation cover with insulation outer barrel
For polytetrafluoroethylene (PTFE) insulation cover.
Also include temperature sensor, the probe of the temperature sensor is placed in the sealing thermal insulation intracavitary.
Also include multi-channel information Acquisition Circuit, each passage respectively with the pressure sensor, temperature sensor and body
Strain transducer connects, and is also connected with baroceptor.
The multi-channel information Acquisition Circuit is four-way Acquisition Circuit, the four-way Acquisition Circuit include storage card and
Network interface, the four-way Acquisition Circuit are 24 chips, and its sample frequency is 100 times/second.
Also include being used for the electrically operated valve for producing dynamic measuring signal, the electrically operated valve is installed on the extraction gas port
On.
A kind of body that the utility model embodiment provides it can be seen from above-mentioned technical scheme provided by the utility model should
Become dynamic characteristic measuring instrument, it can obtain the transmission of sensor according to the input and output collection signal fitting of test system
Function, that is, the dynamic characteristic of body strain sensor is obtained, and then solve body strain present in prior art and sense
The situation that device dynamic characteristic (transmission function) is short in understanding.
Brief description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme of the utility model embodiment
The accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present utility model
Example, on the premise of not paying creative work, can also be according to these accompanying drawings for one of ordinary skill in the art
Obtain other accompanying drawings.
Fig. 1 is the structural representation for the body strain dynamic characteristic measuring instrument that the utility model embodiment provides；
Fig. 2 is the circuit theory schematic diagram for the body strain dynamic characteristic measuring instrument that the utility model embodiment provides.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole realities
Apply example.Based on embodiment of the present utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment obtained, belongs to the scope of protection of the utility model.
The utility model aims to solve the problem that body strain sensor dynamic characteristic (i.e. transmission function) present in prior art lacks
The situation of weary understanding.The dynamic characteristic of Systems with Linear Observation system is generally described with transmission function, transmission function is nulling initial strip
The offline sexual system response of part (exports) Laplace transform (or z-transform) of amount with encouraging and (inputting) Laplce of amount to become
Alternatively compare.How the transmission function of observation system, usually system transter differential with describe its characteristics of motion are obtained
Equation is corresponding, and structural relation export that can be according to the transmission function of each unit of composition system and between them is entirely observed
System transter.In theory, any complicated linear system is considered as being made up of some basic links, these links
Including proportional component, inertial element, differentiation element, integral element and delay link etc..And if system integral link and mutually
Relationship Comparison is complicated, it is difficult to be described with the differential equation, but can pass through input quantity known to observation system and the reality of system output quantity
Proved recipe method, it is determined that or identifying system transmission function.Due to the particularity and complexity of body strain sensor construction, one side is very
Hardly possible is described with the differential equation and is simplified sensing system, on the other hand, even if obtained theoretical model is also required to pass through reality
Verified and simplified model is modified.
Therefore, the utility model devises volume type sensor passes on the basis of body strain sensor construction is analyzed
The tester of function, with reference to corresponding test circuit, Acquisition Circuit, it can be gathered with the input according to test system and output
Signal fitting obtains the transmission function of sensor, that is, obtains the dynamic characteristic of body strain sensor, existing so as to solve
The situation that volume type sensor dynamic characteristic (transmission function) is short in understanding present in technology.
In body strain dynamic characteristic measuring instrument provided by the utility model, as a result of gas as medium, step
Signal energy is very fast with frequency decay, and fit procedure needs to use complete documentation input/output signal, by input and output signal
To be fitted the transmission function of body strain sensor.Therefore, it is necessary to record body strain in the test of body strain sensor transfer function
The response of sensor input signal and body strain sensor to input signal, subsequently to be transmitted according to input and output
Function.It is bigger to be additionally, since influence of the indoor environment temperature to test signal, in order to reduce influence of the temperature to sensor,
Ensure the accuracy of measurement result, it is necessary to ensure that body strain sensor is in temperature constant state.Furthermore for the choosing of test signal
Select, preferably select the abundant signal of radio-frequency component, such as hydraulic pressure or adding for gas can be selected to unload to obtain high-frequency signal.Its
In, hydraulic pressure plus unloading and air pressure plus unloading is compared, and can be obtained than the steeper change of air pressure unloading, that is, high-frequency information
More rich, still, aqueous medium is not readily available constant temperature effect, it is contemplated that temperature factor, is added using gas in the utility model and unloaded
Carry, to obtain the effect more more stable than aqueous medium.In addition, the bore of relief valve is designed as far as possible in the utility model big
Some, and to reduce venting duration, it is as abundant as possible to be obtained the control that is switched using electric electromagnetic valve for high-frequency signal
Test signal.
For ease of understanding, the utility model embodiment is described in further detail below in conjunction with accompanying drawing.
A kind of body strain dynamic characteristic measuring instrument provided by the utility model, it implements structure as shown in figure 1, bag
Sealing thermal insulation cavity 3,7,9, extraction gas port 1, pressure sensor 4 (or differential pressure pick-up) and body strain sensor 6 are included, its
In, the extraction gas port 1 is arranged on sealing thermal insulation cavity 3,7,9, for (being surveyed to the inner chamber of sealing thermal insulation cavity 3,7,9
Try chamber) adjustment pressure (pressurization or pressure release), body strain sensor 6 is arranged inside sealing thermal insulation cavity 3,7,9, and the pressure passes
Sensor 4 is installed on sealing thermal insulation cavity 3,7,9 and respective sensor probe is placed in sealing thermal insulation cavity 3,7,9, wherein
Pressure sensor 4 measures the pressure change in the heat-preservation cylinder inside the sealing thermal insulation cavity 3,7,9.
In above-mentioned measuring instrument, the sealing thermal insulation cavity 3,7,9 includes insulation cover 3, insulation inner cylinder 7 and insulation outer barrel
9, it is vacuum interlayer 8 between the insulation inner cylinder 7 and insulation outer barrel 9, and bleeding point 10 is provided with the insulation outer barrel 9,
The insulation cover 3, which is installed on to make on the insulation inner cylinder 7 and insulation outer barrel 7, forms one in the sealing thermal insulation cavity 3,7,9
The incubation cavity of sealing.Further, it is additionally provided with cable connection port 2 on the insulation cover 3.
Wherein, influenceed to reduce the incubation cavity in sealing thermal insulation cavity 3,7,9 by ambient temperature, be incubated inner cylinder 7 and insulation
The interlayer formed among outer barrel 9 can be evacuated mode to realize constant temperature by bleeding point 10.Further, in the insulation
Cylinder 7 can use stainless steel insulation inner cylinder and stainless steel insulation outer barrel with insulation outer barrel 9 respectively, and the insulation cover 3 can use
Polytetrafluoroethylene (PTFE) insulation cover；I.e. insulation outer barrel 9 and insulation inner cylinder 7 can be made of stainless steel material accordingly, and insulation cover 3 can
Using polytetrafluoroethylmaterial material, further to weaken influence of the extraneous temperature to inner chamber, to reduce heat transfer, realize that sealing is protected
The purpose of incubation cavity constant temperature in warm cavity 3,7,9.
In body strain dynamic characteristic measuring instrument provided by the utility model, temperature sensor 5 can also be included, it is described
The probe of temperature sensor 5 is placed in the internal insulation cylinder of the sealing thermal insulation cavity 3,7,9, to detect the temperature inside heat-preservation cylinder
Degree, it is easy to the monitoring to temperature in heat-preservation cylinder in test process, detects constant temperature effect in heat-preservation cylinder, and then be easy to adjustment control to protect
Demonstrate,prove the constant of heat-preservation cylinder internal temperature.
Body strain sensor transfer function measurement process needs the outside input of measurement sensor, the output signal of sensor
And the signal such as inner chamber temperature change of measuring instrument.To gather corresponding signal parameter, above-mentioned body strain dynamic characteristic measuring instrument
Device can also include multi-channel information Acquisition Circuit, as shown in Fig. 2 the data acquisition unit in multi-channel information Acquisition Circuit is each
Individual passage respectively with the pressure sensor (i.e. pressure sensor and circuit), baroceptor (i.e. baroceptor and electricity
Road), temperature sensor 5 (i.e. temperature sensor and circuit) connected with body strain sensor, for being distinguished by each passage
Collection obtains the supplemental characteristic of each sensor collection, and the supplemental characteristic of collection is passed into follow-up processing equipment (as counted
Calculation machine etc.) handled.Wherein, pressure sensor also includes corresponding amplifying circuit, is believed with amplifying the pressure parameter collected
Number；Measurement channel is helped supplemented by the temperature sensor 5 and baroceptor, for detecting body strain dynamic characteristic measuring instrument
State, wherein, temperature sensor 5 is used for the inner chamber temperature for measuring the sealing thermal insulation cavity 3,7,9, and the baroceptor is used
In the change for monitoring the body strain dynamic characteristic measuring instrument outside atmospheric pressure, that is, it is used for the atmospheric pressure for testing external environment condition
Change；The signal parameter of the body strain sensor collection, which is output to data acquisition unit, can connect the filtered electrical of different filter factors
Road.
Further, the multi-channel information Acquisition Circuit can be four-way Acquisition Circuit, the four-way collection electricity
Road includes storage card and network interface, and the storage card is used to store the supplemental characteristic gathered by each passage, and the network connects
Mouth then be used for processing equipment connection communication, to send the supplemental characteristic of collection to corresponding processing equipment.And described four
Passage Acquisition Circuit can use 24 chips to realize that its sample frequency can be 100 times/second.
In above-mentioned body strain dynamic characteristic measuring instrument, can also include being used for the motor-driven valve for producing dynamic measuring signal
Door, the electrically operated valve are installed on the extraction gas port 1.Extraction gas port 1 is controlled using electrically operated valve can be than manual
Valve produces steeper dynamic measuring signal, and then can obtain and more preferably test effect.
Base of the above-mentioned body strain dynamic characteristic measuring instrument provided by the utility model in analysis body strain sensor construction
On plinth, the transmission function of sensor can be obtained according to the input and output collection signal fitting of test system, that is, obtain body
The dynamic characteristic of strain transducer, solve the situation being short in understanding to body strain sensor, be that the sensor data is moving
State application provides the foundation condition.
Based on above-mentioned body strain dynamic characteristic measuring instrument, corresponding body strain dynamic characteristic measuring processing procedure can wrap
Include following processing step：
(1) input test signal of the body strain dynamic characteristic measuring instrument is obtained, and the detection body strain is moved
The output signal of step response measuring instrument；
(2) Fourier transformation processing is carried out to the input test signal and the output signal；
(3) calculated based on the result after Fourier transformation processing and determine the body strain dynamic characteristic measuring instrument
The frequency response function of device；
Wherein, calculating the processing step for the frequency response function for determining the body strain dynamic characteristic measuring instrument includes：
The calculation of the frequency response function H is：Wherein, Y is the Fourier transformation of the output signal
Result, A are the Fourier transformation result of the input test signal.
(4) according to the frequency response function and the measurement result of transmission function structure determination body strain dynamic characteristic；
Wherein, the step of measurement result of the determination body strain dynamic characteristic includes：
According to the frequency response function and transmission function structure, drawn by way of progressive alternate within error range
Transfer-function coefficient, obtain measurement result.
That is, it is assumed that do not have noisy influence during body strain frequency characteristic test, then body should than frequency
Characteristic can be obtained simply except output spectra by the input spectrum of tracer signal.
Specifically, based on above-mentioned body strain dynamic characteristic measuring instrument, (i.e. dynamic is special for corresponding body strain transmission function
Property) the implementation process of method of testing can include：
If the input test signal of test system (i.e. body strain dynamic characteristic measuring instrument) is a, the frequency of test system
Receptance function is H, and the output signal of test system is y, and corresponding signal has following relation in frequency domain：
Y=HA
It can then be derived from：
In above formula, Y and the Fourier transformation that A is output signal y and input test signal a.
, can be to determine the frequency characteristic of test system after frequency response function H has been obtained based on above formula.It
Afterwards, system transter is asked to use Levy methods by the frequency characteristic of test system, specifically can be according to the frequency of test
Rate characteristic and specific transmission function structure draw the transfer-function coefficient within error range by progressive alternate, and then realize
The measurement of corresponding body strain dynamic characteristic.
It is described above, the only preferable embodiment of the utility model, but the scope of protection of the utility model is not
This is confined to, any one skilled in the art can readily occur in the technical scope that the utility model discloses
Change or replacement, should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should
It is defined by the protection domain of claims.
Claims (7)
1. a kind of body strain dynamic characteristic measuring instrument, it is characterised in that passed including sealing thermal insulation cavity, extraction gas port, pressure
Sensor and body strain sensor, wherein, the extraction gas port is arranged on sealing thermal insulation cavity, and body strain sensor is arranged at close
Seal heat-insulated cavity inside, the pressure sensor is respectively arranged on sealing thermal insulation cavity and respective sensor probe be placed in it is close
Seal in heat-insulated cavity.
2. body strain dynamic characteristic measuring instrument according to claim 1, it is characterised in that the sealing thermal insulation cavity bag
Insulation cover, insulation inner cylinder and insulation outer barrel are included, is vacuum interlayer between the insulation inner cylinder and insulation outer barrel, and in the insulation
Bleeding point is provided with outer barrel, the insulation cover is installed on the insulation inner cylinder and insulation outer barrel and makes the sealing thermal insulation cavity
The interior incubation cavity for forming a sealing.
3. body strain dynamic characteristic measuring instrument according to claim 2, it is characterised in that the insulation inner cylinder and insulation
Outer barrel is respectively stainless steel insulation inner cylinder and stainless steel insulation outer barrel, and the insulation cover is polytetrafluoroethylene (PTFE) insulation cover.
4. body strain dynamic characteristic measuring instrument according to claim 1, it is characterised in that also including temperature sensor,
The probe of the temperature sensor is placed in the sealing thermal insulation intracavitary.
5. body strain dynamic characteristic measuring instrument according to claim 4, it is characterised in that also adopted including multi-channel information
Collector, each passage are connected with the pressure sensor, temperature sensor and body strain sensor respectively, and and and air pressure transmission
Sensor connects.
6. body strain dynamic characteristic measuring instrument according to claim 5, it is characterised in that the multi-channel information collection
Circuit is four-way Acquisition Circuit, and the four-way Acquisition Circuit includes storage card and network interface, the four-way collection electricity
Road is 24 chips, and its sample frequency is 100 times/second.
7. the body strain dynamic characteristic measuring instrument according to any one of claim 1 to 6, it is characterised in that also include using
In the electrically operated valve for producing dynamic measuring signal, the electrically operated valve is installed on the extraction gas port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720472246.8U CN206862532U (en) | 2017-04-28 | 2017-04-28 | A kind of body strain dynamic characteristic measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720472246.8U CN206862532U (en) | 2017-04-28 | 2017-04-28 | A kind of body strain dynamic characteristic measuring instrument |
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| CN206862532U true CN206862532U (en) | 2018-01-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872082A (en) * | 2017-04-28 | 2017-06-20 | 中国地震局地壳应力研究所 | A kind of body strain dynamic characteristic measuring instrument and measuring method |
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2017
- 2017-04-28 CN CN201720472246.8U patent/CN206862532U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872082A (en) * | 2017-04-28 | 2017-06-20 | 中国地震局地壳应力研究所 | A kind of body strain dynamic characteristic measuring instrument and measuring method |
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Granted publication date: 20180109 |