CN103063229A - System for testing transfer function and sensitivity of pendulum inclinometer and testing method - Google Patents

System for testing transfer function and sensitivity of pendulum inclinometer and testing method Download PDF

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Publication number
CN103063229A
CN103063229A CN2012105759264A CN201210575926A CN103063229A CN 103063229 A CN103063229 A CN 103063229A CN 2012105759264 A CN2012105759264 A CN 2012105759264A CN 201210575926 A CN201210575926 A CN 201210575926A CN 103063229 A CN103063229 A CN 103063229A
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China
Prior art keywords
laser interferometer
sloping platform
pendulum inclinometer
pendulum
inclinometer
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CN2012105759264A
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Chinese (zh)
Inventor
李正媛
周云耀
陈志遥
马武刚
吴涛
胡国庆
吕永清
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Institute of Earthquake of China Earthquake Administration
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Institute of Earthquake of China Earthquake Administration
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Priority to CN2012105759264A priority Critical patent/CN103063229A/en
Publication of CN103063229A publication Critical patent/CN103063229A/en
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Abstract

The invention discloses a system for testing a transfer function and sensitivity of a pendulum inclinometer and a testing method, relating to seismological observation technology. The system comprises the pendulum inclinometer (1), an inclined platform (2), a reflector (3), a reflector support (4), an interference mirror (5), a micrometric displacement generator (6), a laser interferometer pedestal (7) and a laser interferometer (8). According to the invention, the laser interferometer is used for testing, so high precision is obtained, and transfer to national standards of China can be realized; the transfer function is tested by using a step response method, so the advantages of convenient operation and high test efficiency are obtained; and the system and the method are applicable to a variety of pendulum inclinometers.

Description

System and the method thereof of test pendulum inclinometer transport function and sensitivity
Technical field
The present invention relates to Observation Technology of Earthquakes, relate in particular to a kind of system and method thereof 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 Observation of realization high precision requires to adopt special-purpose scientific instrument and at special cavern observing environment, for a long time, observes 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 real high precision crustal deformation field 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, be the important instrument measured for crustal deformation subject and earthquake subject it.Pendulum inclinometer is comprised 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 in theory the whole bag of tricks such as step response method, sinusoidal wave method of testing and shaking table method of testing.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 object of the invention is to overcome the shortcoming and defect that prior art exists, a kind of system and method thereof 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 object of the present invention is achieved like this:
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 thus pendulum inclinometer.
One, the system (abbreviation system) 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 foot screw rods below the sloping platform, wherein two adjustable foot screw rods be arranged on basement rock above, adjustable foot 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, the method (abbreviation method) of test pendulum inclinometer transport function and sensitivity
This method comprises the following steps:
1. pendulum inclinometer Real-time Collection ground tilt data, laser interferometer Real-time Collection sloping platform is 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 present invention has following advantages and good effect:
1. test with laser interferometer, precision is high, can with the national standard transmission;
2. easy to operate with step response method test transport function, testing efficiency is high;
3. be applicable to all kinds of pendulum inclinometers.
Description of drawings
Fig. 1 is the structural representation of native system.
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, system
1, overall
Such as Fig. 1, native system 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 foot screw rods below the sloping platform 2, wherein two adjustable foot screw rods be arranged on basement rock 0 above, adjustable foot 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;
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.
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
Laser interferometer 8 is linear measure longimetry reference instruments that a kind of nanoscale can be traced to the source.
By the transmission of laser between catoptron and interference mirror, and utilizing emitted light and reflected light are sent into laser interferometer 8 simultaneously form interference fringes, measure the instrument of change of 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 the adjustable foot screw rod, allows micrometric displacement generating means 6 and sloping platform 2 tight coupling, adjusts three adjustable foot 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 large as much as possible in the instrument response scope; This pulse meeting makes the height of micrometric displacement generating means 6 occur 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 represent with formula (1)
F ( s ) = K ω n 2 s 2 + 2 ξ ω n s + ω n 2 - - - ( 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 is different, and the unit-step response that obtains is 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 processes:
1. test data is carried out normalized
Test data is treated to unit-step nsponse 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.
Micro displacement generator 6 changes test platform 2 one end generation vertical increment, pendulum inclinometer 1 therefore thereupon run-off the straight, 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):
Δ α i = ΔH L ρ - - - ( 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:
b ‾ = 1 n Σ i = 1 n b i - - - ( 4 )
In the formula:
b iThe instrumental sensitivity of-the i time test;
The duplicate measurements number of times of n---test.

Claims (2)

1. system that tests inclinator 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 foot screw rods below the sloping platform (2), wherein two adjustable foot screw rods be arranged on basement rock (0) above, adjustable foot 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).
2. based on the method for testing of the system of test inclinator transport function claimed in claim 1 and sensitivity, it is characterized in that comprising the following steps:
1. pendulum inclinometer (1) Real-time Collection ground tilt data, laser interferometer (8) Real-time Collection sloping platform (2) is vertically to relative displacement;
2. produce pulse signal by micrometric displacement generating means (6);
3. the pulse signal of sloping platform (2) response of step in 2. produces tilt quantity;
4. 3. medium dip amount of pendulum inclinometer (1) response of step, the change procedure of output sloping platform (2);
5. after laser interferometer (8) the response tilt quantity, output sloping platform (2) vertically to relative displacement;
6. analyze the data of pendulum inclinometer (1), calculate the transport function of pendulum inclinometer (1);
7. analyze the data of laser interferometer (8) and pendulum inclinometer (1), calculate the sensitivity of pendulum inclinometer (1).
CN2012105759264A 2012-12-26 2012-12-26 System for testing transfer function and sensitivity of pendulum inclinometer and testing method Pending CN103063229A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN108709568A (en) * 2018-08-23 2018-10-26 中国地震局地壳应力研究所 Dipmeter detection device
CN108759783A (en) * 2018-08-23 2018-11-06 中国地震局地壳应力研究所 Inclination measuring device
CN109738943A (en) * 2019-03-20 2019-05-10 中国地震局地壳应力研究所 A kind of fast and stable system of the pendulum sensor for seismic monitoring instrument
CN110411479A (en) * 2019-08-26 2019-11-05 山东省计量科学研究院 A kind of laser plummet digital calibration system and application

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN108709568A (en) * 2018-08-23 2018-10-26 中国地震局地壳应力研究所 Dipmeter detection device
CN108759783A (en) * 2018-08-23 2018-11-06 中国地震局地壳应力研究所 Inclination measuring device
CN108709568B (en) * 2018-08-23 2024-05-10 中国地震局地壳应力研究所 Clinometer detection device
CN109738943A (en) * 2019-03-20 2019-05-10 中国地震局地壳应力研究所 A kind of fast and stable system of the pendulum sensor for seismic monitoring instrument
CN109738943B (en) * 2019-03-20 2023-09-22 应急管理部国家自然灾害防治研究院 Quick stabilizing system for pendulum sensor of earthquake monitoring instrument
CN110411479A (en) * 2019-08-26 2019-11-05 山东省计量科学研究院 A kind of laser plummet digital calibration system and application

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Application publication date: 20130424