CN203069192U - Device for testing transmission function and sensitivity of pendulum type inclinometer - Google Patents
Device for testing transmission function and sensitivity of pendulum type inclinometer Download PDFInfo
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- CN203069192U CN203069192U CN2012207300696U CN201220730069U CN203069192U CN 203069192 U CN203069192 U CN 203069192U CN 2012207300696 U CN2012207300696 U CN 2012207300696U CN 201220730069 U CN201220730069 U CN 201220730069U CN 203069192 U CN203069192 U CN 203069192U
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- laser interferometer
- sensitivity
- sloping platform
- inclinometer
- pendulum inclinometer
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Abstract
The utility model discloses a device for testing a transmission function and the sensitivity of a pendulum type inclinometer, and relates to the technology of earthquake observation. The device comprises the pendulum type inclinometer (1), an inclined platform (2), a reflector (3), a reflector bracket (4), an interference mirror (5), a micro displacement generation device (6), a laser interferometer base (7) and a laser interferometer (8). By the laser interferometer for testing the transmission function and the sensitivity, the device is high in precision and can meet the national standard; the transmission function is tested by a step-response method; and the device is convenient to operate, high in test efficiency and suitable for various types of pendulum type inclinometers.
Description
Technical field
The utility model relates to the seismological observation technology, relates in particular to a kind of device of testing pendulum inclinometer transport function and sensitivity.
Background technology
China's earthquake deformation measuring platform net begins to set up after Xingtai earthquake, and existing hundreds of cover declivity observation instruments move in the platform net at present.
The little deformation of realization high precision is observed the requirement special-purpose scientific instrument of employing and at special cavern observing environment, for a long time, is observed owing to the shortage detection technique for this class, and to observe the solid tide deformation (10 of the earth
-7～10
-11) be the instrument development target, as the standard of weighing instrument, and fail accurately to provide the key property index of instrument with the performance index of observational data.The blank of this technical support condition causes the observed quantity of this quasi-instrument to lack the value comparability, therefore can not obtain the real variable field of hull shape accurately time-space process rule.
Pendulum inclinometer is a kind of high precision instrument of measuring inclination, and it can measure solid tide and crustal deformation, is one of important instrument for crustal deformation subject and the measurement of earthquake subject.Pendulum inclinometer is made up of mechanical pick-up device, electronic circuit and three parts of data acquisition.Its transport function and sensitivity are one of of paramount importance parameters of inclinator.In order to test this two parameters, can use the whole bag of tricks such as step response method, sinusoidal wave method of testing and shaking table method of testing in theory.But because the observing frequency of inclinator is low especially, signal period is long especially, sinusoidal wave method of testing and shaking table method of testing can't provide the driving signal of such ultra-long period, so step response method is test pendulum inclinometer transport function and the most simple and effective method of sensitivity.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming and defect that prior art exists, a kind of device of testing pendulum inclinometer transport function and sensitivity is provided, thereby obtain observing frequency scope and the scale value of pendulum inclinometer, and then the observed result of pendulum inclinometer and national standard are traced to the source.
The purpose of this utility model is achieved in that
The step signal of utilizing micro-displacement apparatus to produce a suitable size promotes sloping platform, simulates the ground motion that pendulum inclinometer observes; Because step signal is the broadband signal of a continuous frequency spectrum, can excite the frequency response of instrument; By the response curve of record pendulum inclinometer under the step signal effect, The Fitting Calculation goes out the transport function of instrument; Because the excitation of step signal, instrument is run-off the straight thereupon, and the pendulum inclinometer output quantity changes thereupon, and the perpendicular displacement that laser interferometer is then measured sloping platform changes the sensitivity that can calculate pendulum inclinometer thus.
One, the device (abbreviation device) of test pendulum inclinometer transport function and sensitivity
Native system comprises pendulum inclinometer, sloping platform, catoptron, mirror support, interference mirror, micrometric displacement generating means, laser interferometer base and laser interferometer;
On the both sides of basement rock, be provided with sloping platform and laser interferometer base;
Be provided with three adjustable pin screw rods below the sloping platform, wherein two adjustable pin screw rods be arranged on basement rock above, adjustable pin screw rod be arranged on the micrometric displacement generating means above;
Be provided with pendulum inclinometer and interference mirror above sloping platform, mirror support is arranged on the basement rock, and catoptron is arranged on the mirror support, and catoptron and interference mirror are on a pedal line;
Laser interferometer is arranged on the laser interferometer base, and the Laser emission direction of laser interferometer is aimed at interference mirror.
Two, test pendulum inclinometer transport function and sensitivity of method (abbreviation method)
This method comprises the following steps:
1. pendulum inclinometer is gathered the ground tilt data in real time, and laser interferometer is gathered sloping platform in real time vertically to relative displacement;
2. produce pulse signal by the micrometric displacement generating means;
3. the pulse signal of sloping platform response of step in 2. produces tilt quantity;
4. 3. medium dip amount of pendulum inclinometer response of step, the change procedure of output sloping platform;
5. after the laser interferometer response tilt quantity, the output sloping platform vertically to relative displacement;
6. analyze the data of pendulum inclinometer, calculate the transport function of pendulum inclinometer;
7. analyze the data of laser interferometer and pendulum inclinometer, calculate the sensitivity of pendulum inclinometer.
The utlity model has following advantage and good effect:
1. test with laser interferometer, the precision height, can with the national standard transmission;
2. test transport function with step response method, easy to operate, the testing efficiency height;
3. be applicable to all kinds of pendulum inclinometers.
Description of drawings
Fig. 1 is the structural representation of this device.
Among the figure:
0-basement rock;
1-pendulum inclinometer;
2-sloping platform;
3-catoptron;
4-mirror support;
5-interference mirror;
6-micrometric displacement generating means;
7-laser interferometer base;
8-laser interferometer.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, device
1, overall
As Fig. 1, this device comprises pendulum inclinometer 1, sloping platform 2, catoptron 3, mirror support 4, interference mirror 5, micrometric displacement generating means 6, laser interferometer base 7 and laser interferometer 8;
On the both sides of basement rock 0, be provided with sloping platform 2 and laser interferometer base 7;
Be provided with three adjustable pin screw rods below the sloping platform 2, wherein two adjustable pin screw rods be arranged on basement rock 0 above, adjustable pin screw rod be arranged on micrometric displacement generating means 6 above;
Be provided with pendulum inclinometer 1 and interference mirror 5 above sloping platform 2, mirror support 4 is arranged on the basement rock 0, and catoptron 3 is arranged on the mirror support 4, and catoptron 3 and interference mirror 5 are on a pedal line;
2, functional part
1) pendulum inclinometer 1
Utilize the structure that hangs weight to test the earthquake instrumentation of terrain slope.
2) sloping platform 2
Sloping platform 2 is a kind of universal products.
3) catoptron 3
Catoptron 3 is a kind of universal products.
4) mirror support 4
Mirror support 4 is a kind of supports that catoptron is installed.
5) interference mirror 5
Interference mirror 5 is a kind of universal products.
6) the micrometric displacement generating means 6
Micrometric displacement generating means 6 is a kind of universal products, and it can provide the device of micron order displacement.
7) the laser interferometer base 7
Laser interferometer base 7 is a kind of bases that laser interferometer is installed.
8) laser interferometer 8
By the transmission of laser between catoptron and interference mirror, and will launch light and reflected light and send into laser interferometer 8 simultaneously and form interference fringes, measure the instrument of variable in distance between catoptron and the interference mirror with this.
3, principle of work
Sloping platform 2 is placed on the basement rock 0, and an end of sloping platform 2 is supported on the micrometric displacement generating means 6 by adjustable pin screw rod, allows micrometric displacement generating means 6 and sloping platform 2 tight coupling, adjusts three adjustable pin screw rods of sloping platform 2, makes sloping platform 2 levels.Pendulum inclinometer 1 is placed on the sloping platform 2, and an end of micrometric displacement generating means 6 is installed interference mirror 3, utilizes mirror support 4 that catoptron 3 is fixed on the vertical direction of interference mirror 5.Adjust the setting nut of pendulum inclinometer 1 and put level, utilize the zeroing function of instrument to adjust instrument to duty.Adjust the position of catoptron 3 and laser interferometer 1, make it form optical interference circuit, laser interferometer 8 is in running order.
Two, method
1, step 6.: the test transport function
Add sizeable step pulse for micrometric displacement generating means 6, and kept this state 5-8 minute; The size of step pulse should be big as much as possible in the instrument response scope; This pulse meeting makes the height of micrometric displacement generating means 6 take place to change fast, this change makes sloping platform 2 produce a phase step type tilt variation, pass to pendulum inclinometer 1 by sloping platform 2, pendulum inclinometer 1 can reflect this variation, according to the data of step response, can calculate the transport function of instrument.
Transport function is calculated the structural principle according to pendulum inclinometer 1, and its transport function can be come approximate description with order transfer function.
Its mathematical model can be represented with formula (1)
In the formula:
ω
n-undamped oscillation frequency (free-running frequency);
ξ-relative damping factor;
K-enlargement factor;
S-plural variable.
Depend on ω the time response of second order coefficient
nWith two parameters of ξ.Relative damping factor ξ difference, the unit-step response that obtains are also different.Actual test is to ask for ω according to the step response record data of instrument
n, ξ, thereby do not contained the expression formula of the order transfer function of the K that gains.
Following these steps to carry out data handles:
1. test data is carried out normalized
Test data is treated to the unit-step response curve.
2. least square fitting calculates
Calculate theoretical step response data curve by the unit-step response formula, with this theoretical curve normalization data is carried out match; By changing theoretical curve ξ and ω
nValue, obtain between the two residual error with least square method; When the root-mean-square value of match residual error less than 0.001 the time, think that namely this theoretical curve overlaps with test data, then the parameter ξ of this theoretical curve, ω
nValue be exactly ξ, the ω of test data
nValue; With ξ, ω
nValue substitution formula (1), obtain the normalized transfer function expression formula of instrument.
2, step 7.: measurement sensitivity
Sensitivity test is similar with the process of transport function, utilizes laser interferometer 8 can detect sloping platform 2 vertically to step amount, divided by land lengths, can get sloping platform 2 angles of inclination.Sensitivity is that the variation of surveying instrument response is divided by the excitation variation of correspondence.Therefore, the output quantity of pendulum inclinometer 1 divided by the angle of inclination, can be obtained the one-shot measurement result of sensitivity.Repeatedly measure to average and to obtain the sensitivity of pendulum inclinometer 1.
Micrometric displacement generator 6 changes test platform 2 one end generation vertical increment, pendulum inclinometer 1 therefore run-off the straight thereupon, the output quantity of pendulum inclinometer 1 changes thereupon, and 8 of laser interferometer are measured the perpendicular displacement variation of sloping platform 2 and calculated tilt quantity according to formula (2):
In the formula:
Δ H-laser interferometer 8 readings, unit: m;
The base length of L-sloping platform 2, unit: m;
ρ-rad and degree conversion coefficient get 206265.
Sensitivity is by pendulum inclinometer 1 output voltage variation delta y
iDivided by tilt variation amount Δ α
iTry to achieve.Pendulum inclinometer 1 sensitivity and mean value calculate by formula (3) (4):
The sensitivity of single measurement:
Δb
i＝Δy
i/Δα
i （3）
Sensitivity mean value:
In the formula:
b
i---the instrumental sensitivity of the i time test;
The duplicate measurements number of times of n---test.
Claims (1)
1. device of testing pendulum inclinometer transport function and sensitivity is characterized in that:
Comprise pendulum inclinometer (1), sloping platform (2), catoptron (3), mirror support (4), interference mirror (5), micrometric displacement generating means (6), laser interferometer base (7) and laser interferometer (8);
Both sides in basement rock (0) are provided with sloping platform (2) and laser interferometer base (7);
Be provided with three adjustable pin screw rods below the sloping platform (2), wherein two adjustable pin screw rods be arranged on basement rock (0) above, adjustable pin screw rod be arranged on micrometric displacement generating means (6) above;
Be provided with pendulum inclinometer (1) and interference mirror (5) in the top of sloping platform (2), mirror support (4) is arranged on the basement rock (0), catoptron (3) is arranged on the mirror support (4), and catoptron (3) and interference mirror (5) are on a pedal line;
Laser interferometer (8) is arranged on the laser interferometer base (7), and the Laser emission direction of laser interferometer (8) is aimed at interference mirror (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207300696U CN203069192U (en) | 2012-12-26 | 2012-12-26 | Device for testing transmission function and sensitivity of pendulum type inclinometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207300696U CN203069192U (en) | 2012-12-26 | 2012-12-26 | Device for testing transmission function and sensitivity of pendulum type inclinometer |
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| Publication Number | Publication Date |
|---|---|
| CN203069192U true CN203069192U (en) | 2013-07-17 |
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| CN2012207300696U Expired - Lifetime CN203069192U (en) | 2012-12-26 | 2012-12-26 | Device for testing transmission function and sensitivity of pendulum type inclinometer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063229A (en) * | 2012-12-26 | 2013-04-24 | 中国地震局地震研究所 | System for testing transfer function and sensitivity of pendulum inclinometer and testing method |
| CN104793258A (en) * | 2015-04-29 | 2015-07-22 | 中国地震局地球物理研究所 | Vertical gravity gradient measurement system |
| CN105005088A (en) * | 2015-04-29 | 2015-10-28 | 中国地震局地球物理研究所 | Vertical gravity gradient measurement method |
-
2012
- 2012-12-26 CN CN2012207300696U patent/CN203069192U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063229A (en) * | 2012-12-26 | 2013-04-24 | 中国地震局地震研究所 | System for testing transfer function and sensitivity of pendulum inclinometer and testing method |
| CN104793258A (en) * | 2015-04-29 | 2015-07-22 | 中国地震局地球物理研究所 | Vertical gravity gradient measurement system |
| CN105005088A (en) * | 2015-04-29 | 2015-10-28 | 中国地震局地球物理研究所 | Vertical gravity gradient measurement method |
| CN105005088B (en) * | 2015-04-29 | 2017-03-29 | 中国地震局地球物理研究所 | Vertically to gradiometry method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wuhan branch earthquake instrument factory Assignor: INSTITUTE OF EARTHQUAKE, CHINA EARTHQUAKE ADMINISTRATION Contract record no.: 2014420000001 Denomination of utility model: Device for testing transmission function and sensitivity of pendulum type inclinometer Granted publication date: 20130717 License type: Exclusive License Record date: 20140113 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130717 |
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| CX01 | Expiry of patent term |