CN201859225U - Precision measuring system of seismic detector - Google Patents
Precision measuring system of seismic detector Download PDFInfo
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- CN201859225U CN201859225U CN2010205722764U CN201020572276U CN201859225U CN 201859225 U CN201859225 U CN 201859225U CN 2010205722764 U CN2010205722764 U CN 2010205722764U CN 201020572276 U CN201020572276 U CN 201020572276U CN 201859225 U CN201859225 U CN 201859225U
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Abstract
The utility model provides a precision measuring system of a seismic detector, which belongs to the field of vibration detection, and comprises a control device, a vibration table drive device, a vibration table, a vibration meter and a signal processing device, wherein the control device sends a signal to the vibration table drive device, the vibration table drive device drives the vibration table, the vibration of the vibration table is detected by the vibration meter, processed and then sent to the control device by the signal processing device, and the signal detected by the detector is sent to the control device by the signal processing device. Micro vibration and measurement in a large dynamic range can be carried out on the seismic detector by utilizing the precision measuring system, so that the characteristic measurement of the seismic detector in the large dynamic range and the precision vibration of small signals of the seismic detector can be completed, and proper method for the production and maintenance for seismic detectors used outdoors is offered.
Description
Technical field
The utility model belongs to the vibration detection field, is specifically related to a kind of seismoreceiver precision measurement system, utilizes the accurate performance index that detect seismoreceiver of laser doppler vibrometer under indoor conditions.
Background technology
Geophysical survey is a kind of the most frequently used, the most effective method of exploration of carrying out petroleum prospecting, coal exploration, the hydrology and engineering exploration.It adopts blast or additive method to produce sound wave, and on the ground, embedding at a certain distance numerous wave detectors receive seismic event with them, can be made into seismic section through multiple recording and late time data processing.Can not only find out that on section the stratum height is uneven, can also see because the tomography that earth movement forms etc.Seismoreceiver is that geophysical survey carries out the main tool that vibration wave receives at present, is the key factor of method of seismic prospecting technical development.Its quality quality is directly connected to the exploration quality.
Seismoreceiver is a kind of mechanical energy to be converted to the electromechanical transformation apparatus of electric energy, and it is the sensor special that is applied to earthquake physical prospecting and engineering survey field.Along with the progressively exhaustion of shallow oil resource, current seismic prospecting develops to the deep layer exploration from shallow layer exploration.Because it is very faint from the vibration signal of deep layer, the superficial reflex signal is more much better than than deep reflex signal, therefore require wave detector that bigger dynamic range should be arranged, also suitable sensitivity and resolution should be arranged simultaneously, to guarantee to collect weak echo signal from deep layer.In real work.In order to guarantee construction quality, need regularly wave detector to be detected.
The subject matter that the wave detector detection means of present domestic use exists be detect dynamic range little (＜80db), can't detect for the small-signal that is lower than 1mg.Along with the appearance of new type of high sensitivity wave detector, the detection of the wave detector especially detection of small-signal and great dynamic range can't be satisfied the detection needs.Its main cause is:
1. can't to produce the dynamic range of feeble signal vibration and its vibration not enough for shaking table.
Its main cause is that drive signal is under the small-signal situation, owing to disturbing or other reason distorts easily.Under small-signal drove, the vibration signal of shaking table output also can distort simultaneously.And the vibration signal of general shaking table output can't reach bigger dynamic range (more than 80db), and is especially all the more so when taking into account feeble signal.
2. standard transducer can't detect feeble signal
When carrying out the weak vibration signal measurement, can't provide correct reading as the standard transducer of measuring yardstick, therefore can't determine the actual techniques parameter of tested wave detector.Therefore need to select the higher equipment of precision as standard, this equipment should be able to be exactly and measuring vibrations platform (or tested wave detector) actual vibration situation critically.
3. lack collecting flowchart and the algorithm that is suitable for
Under the weak vibration situation, since influence of various factors such as shaking table self character and surrounding environment interference, the vibration signal that collects possibility more complicated, and noise is far longer than useful signal sometimes.To from such signal, extract Useful Information, need suitable collecting flowchart and algorithm.。
The utility model content
The purpose of this utility model is to solve a difficult problem that exists in the above-mentioned prior art, and a kind of seismoreceiver precision measurement system is provided, and finishes the great dynamic range and the accurate vibration characteristics test of small-signal of seismoreceiver.For the field provides suitable means with the production and the maintenance of seismoreceiver.
The utility model is achieved through the following technical solutions:
A kind of seismoreceiver precision measurement system, described seismoreceiver precision measurement system comprises control device, shaking table drive unit, shaking table, vibration measuring and treating apparatus and signal processing apparatus;
Tested wave detector is installed on the described shaking table;
Described control device is connected with the shaking table drive unit by circuit, and the shaking table drive unit is connected with shaking table by circuit again, and tested wave detector is connected with control device by signal processing apparatus;
The vibration measuring head of described vialog is installed on the The Cloud Terrace, and the vibration signal that the vibration measuring head records is through passing through the signal processing apparatus input control device after the processing of vialog;
Control device sends signal and gives the shaking table drive unit, drive shaking table by the shaking table drive unit, the vibration of shaking table is recorded by vialog and sends control device to by signal processing apparatus then through handling, and the signal that tested wave detector of while records also sends control device to by signal processing apparatus.
For the measurement of vibration signal, use less than 10mg:
Described control device is computing machine and IO interface;
Described vialog is a laser vibration measurer;
Described shaking table drive unit is a high precision digital-to-analog converter;
Described shaking table is the weak signal shaking table, and measurement range is 10ug-100mg;
Described signal processing device is changed to high-precision adc.
For the measurement of vibration signal, use greater than 10mg:
Described control device is computing machine and IO interface;
Described shaking table drive unit comprises high precision digital-to-analog converter and the power amplifier that is attached thereto, and power amplifier is connected with shaking table again;
Described vialog is a laser vibration measurer;
Described shaking table is strong signal shaking table, and measurement range is 10mg-10g;
Described signal processing device is changed to high-precision adc.
No matter be weak signal measurement or strong signal measurement, described high precision digital-to-analog converter all adopts 24 figure place weighted-voltage D/A converters; Described high-precision adc all adopts 24 analog to digital converters.
Described laser vibration measurer adopts laser doppler vibrometer, described laser vibration measurer comprises vialog laser head and vialog controller, code translator etc., the vialog laser head is installed on the The Cloud Terrace, and other parts are contained in the Electric Appliance Cabinet, is connected with laser head by cable; Described computing machine adopts the quiet computing machine of no fan.
When accurately measuring, between tested wave detector and high-precision adc, laser interferometer system is housed.
The step of using described seismoreceiver precision measurement system to measure the weak vibration signal comprises:
Step (one), the natural frequency f of measuring vibrations platform
n
Step (two) is measured the weak vibration signal, and its concrete steps are as follows:
1.. tested wave detector is installed on the weak signal shaking table, installs laser vibration measurer;
2.. high precision digital-to-analog converter is set sends sinusoidal signal frequency f
n, this frequency is the natural frequency f that step () obtains
n
3.. the high precision digital-to-analog converter output level is set, makes that the shaking table vibration acceleration is not more than 0.01mg when this output level;
4.. sample frequency f is set
s, f
s=mf
n, m is the integer greater than 2 here, gets m=32, obtains the highest amplitude analysis precision of frequency domain;
5.. the range that high-precision adc is set is minimum gear range;
6.. gather laser vibration measurer output signal and wave detector output signal simultaneously;
7.. above-mentioned two paths of signals is made fft analysis, and do average treatment, obtain frequency f with further raising signal to noise ratio (S/N ratio)
nThe amplitude that amplitude that place's vialog is measured and wave detector are measured.
The step of using described seismoreceiver precision measurement system to measure the strong vibration signal comprises:
Step (one), the natural frequency f of measuring vibrations platform
n
Step (two) is measured the strong vibration signal, and its concrete steps are as follows:
1.. tested wave detector is installed on the strong signal shaking table, installs laser vibration measurer;
2.. it is f that high precision digital-to-analog converter transmission sinusoidal signal frequency is set
n, this frequency is the natural frequency f that step () obtains
n
3.. the high precision digital-to-analog converter output level is set, makes when this output level, shaking table is 10g with big vibration acceleration vibration such as vibration acceleration;
4.. sample frequency f is set
s, f
s=mf
n, m is the integer greater than 2 here, desirable m=32.Satisfy complete cycle like this and gather, can obtain the highest amplitude analysis precision of frequency domain;
5.. the range that high-precision adc is set is maximum gear range;
6.. gather laser vibration measurer output signal and tested wave detector output signal simultaneously;
7.. above-mentioned two paths of signals is made FFT (discrete Fourier transformation) analyze, and do average treatment, obtain frequency f with further raising signal to noise ratio (S/N ratio)
nThe amplitude that amplitude that place's laser vibration measurer is measured and wave detector are measured.
Wherein, the natural frequency f of described step () measuring vibrations platform
nMay further comprise the steps:
(1) tested wave detector is installed on the shaking table, installs laser vibration measurer;
(2) sweep parameters is set, comprises initial frequency, stop frequency and frequency sweep interval; Frequency sweep retardation coefficient, signal output level and frequency sweep control mode are set;
(3) transmission frequency, the F=initial frequency;
(4) time-delay;
(5) gather the output signal of shaking table signal and high precision digital-to-analog converter simultaneously;
(6) digital correlative filtering calculates frequency response function;
(7) judge whether to satisfy the frequency sweep control mode,, then change step (8) over to,, change step (10) over to if do not satisfy if satisfy;
(8) whether determination frequency less than stopping frequency, if, then change step (9) over to less than stopping frequency,
If be not less than the termination frequency, then change step (12) over to;
(9) calculation of parameter; Calculate shaking table natural frequency f
n
(10) calculate suitable output level; Change step (11) over to;
(11) resend signal; Change step (4) over to;
(12) frequency=current frequency+frequency interval is set; Change step (13) over to;
(13) resend signal; Change step (4) over to.
The course of work of the present utility model is as follows: 24 figure place weighted-voltage D/A converters are exported vibrational waveform according to computer command, directly driven (at weak signal) or driven the shaking table vibration by power amplifier (at strong signal) by 24 figure place weighted-voltage D/A converters, the signal that the laser head of laser doppler vibrometer records is handled back and the detected signal of tested wave detector through controller, the code translator of vialog and is given computing machine by 24 analog to digital converters and communication interface and compare and analyze and handle.When accurately measuring, between tested wave detector and high-precision a/d converter, laser interferometer system is installed, actual vibration speed to tested wave detector detects, laser interferometer system becomes analog electrical signal by its each several part with the mechanical oscillation signal of tested wave detector, the result flows to high-precision a/d converter, flows to computing machine then and compares analysis and processing.
Compared with prior art, the beneficial effects of the utility model are: (1) native system can detect the weak vibration signal less than 10 ū g; (2) oscillating region of native system detection can reach 120dB (10 ū g are to 10g); (3) native system is measured as non-contact measurement, and checkout equipment does not disturb measuring process, does not have contact type measurement because the problem that contact is bad and applied load causes; (4) be mainly used in seismoreceiver resolution and dynamic range and detect, also can be used for the vibration detection of small-signal speed, acceleration transducer.Use this system sensor mass to be monitored the detection method that the comparison precision is arranged.For improving the wave detector quality obvious effect is arranged.
Description of drawings
Below in conjunction with accompanying drawing the utility model is described in further detail:
Fig. 1 is the principle of work block diagram of the utility model seismoreceiver precision measurement system.
Fig. 2 is to use step () measuring vibrations platform natural frequency f in the measurement of the utility model seismoreceiver precision measurement system
nThe step block diagram.
Embodiment
As shown in Figure 1, the utility model seismoreceiver precision measurement system comprises computing machine and IO interface, high precision digital-to-analogue (D/A) converter, weak signal shaking table and tested wave detector, laser vibration measurer, strong signal shaking table and tested wave detector and high precision analogue (A/D) converter.High precision digital-to-analog converter is exported vibrational waveform according to computer command, directly driven (at weak signal) or driven the shaking table vibration by power amplifier (at strong signal) by high precision digital-to-analog converter, the signal that the laser head of laser vibration measurer records is handled back and the detected signal of tested wave detector through controller, the code translator of vialog and is given computing machine by high-precision adc and communication interface and compare and analyze and handle.
In order to improve measurement sensitivity, the utility model has been taked following measure:
1. the small-signal wave form distortion that produces for fear of power amplifier reduces power amplifier power supply interference and the noise jamming of heat radiation electric fan, adopts 24 D/A converters to produce high-precision small-signal output and directly drives the weak signal shaking table;
2. adopt the high sensitivity laser doppler vibrometer to detect the actual vibration of shaking table.
The detectable vibration acceleration scope of laser doppler vibrometer is 10 at present
-8G-10
7G, speed sensing range 50nm/s-30m/s.Its measurement sensitivity is very high, has the dynamic range of non-constant width simultaneously;
3. adopt 24 A/D converters that laser vibration measurer simulation output is converted to high accuracy data;
4. adopt the quiet computing machine of no fan to reduce set noise and the influence of vibration to measuring.
In order to improve measurement range, the measure below the utility model has been taked:
1. shaking table adopts two, strong signal shaking table and weak signal shaking table.Its measurement range is respectively 10mg-10g and 10ug-100mg.The weak signal shaking table adopts the wave detector shaking table MODELID-1 of American I/O company, and strong signal shaking table then adopts the general shaking table JZK-10 of domestic 10g.When vibration signal during less than 10mg, use the weak signal shaking table to test, when vibration signal greater than in 10mg the time, test with strong signal shaking table.Use laser doppler vibrometer can satisfy the needs that great dynamic range detects.
2. drive signal adopts two-way.The weak signal shaking table directly drives with 24 D/A converter outputs; Strong signal shaking table then amplifies rear drive by 24 the D/A converter outputs in another road by power amplifier.
3. adopt 24 A/D converter image data, make image data that very big dynamic range be arranged.
During operate as normal, find out the resonance frequency of shaking table earlier.High precision digital-to-analog converter carries out frequency sweeping according to computer command in the certain frequency scope, when detecting the resonance frequency of shaking table, and the vibrational waveform of fixing this frequency of output.This output directly drives the weak signal shaking table or drives strong signal shaking table by power amplifier.Laser doppler vibrometer and the detected analog passband signal of tested wave detector are crossed high-precision adc and are converted to and give computing machine after the digital signal and compare and analyze and handle.When accurately measuring, laser interferometer system detects the actual vibration speed of tested wave detector, and the result gives computing machine equally and compares analysis and processing.
Specifically, the measurement flow process of the utility model seismoreceiver precision measurement system is divided into three parts:
(1). measure the natural frequency f of the shaking table that is used for weak signal measurement
nThe shaking table that is operated under this natural frequency can provide maximum dynamic range, shaking table natural frequency f
nThe measurement process flow diagram as shown in Figure 2;
(2). measure the weak vibration signal, measure the minimum resolution that can measure tested wave detector by this part, the measurement flow process of measuring the weak vibration signal is as follows:
1.. tested wave detector is installed on the shaking table, installs laser vibration measurer;
2.. high precision digital-to-analog converter is set sends sinusoidal signal frequency f
n, this frequency is the natural frequency f that first obtains
n
3.. the high precision digital-to-analog converter output level is set, makes that the shaking table vibration acceleration is not more than 0.01mg when this output level;
4.. sample frequency f is set
s, f
s=mf
n, m is the integer greater than 2 here, desirable m=32 can satisfy complete cycle like this and gather, and can obtain the highest amplitude analysis precision of frequency domain;
5.. the range that high-precision adc is set is minimum gear range;
6.. gather laser vibration measurer output signal and wave detector output signal simultaneously;
7.. above-mentioned two paths of signals is made fft analysis, and do average treatment, obtain frequency f with further raising signal to noise ratio (S/N ratio)
nThe amplitude that amplitude that place's laser vibration measurer is measured and wave detector are measured.
(3). measure the strong vibration signal, can calculate the minimum resolution and the dynamic range of tested wave detector by calculating, it is as follows to measure strong vibration signal measurement flow process:
1.. tested wave detector is installed on the shaking table, installs laser vibration measurer;
2.. it is f that high precision digital-to-analog converter transmission sinusoidal signal frequency is set
n, for ease of the dynamic perfromance that research goes out in same frequency, this frequency is identical with the frequency that the second portion signal source sends;
3.. the high precision digital-to-analog converter output level is set, makes when this output level, shaking table is 10g with big vibration acceleration vibration such as vibration acceleration;
4.. sample frequency f is set
s, f
s=mf
n, m is the integer greater than 2 here, desirable m=32.Satisfy complete cycle like this and gather, can obtain the highest amplitude analysis precision of frequency domain;
5.. the range that high-precision adc is set is maximum gear range;
6.. gather laser vibration measurer output signal and tested wave detector output signal simultaneously;
7.. above-mentioned two paths of signals is made FFT (discrete Fourier transformation) analyze, and do average treatment, obtain frequency f with further raising signal to noise ratio (S/N ratio)
nThe amplitude that amplitude that place's laser vibration measurer is measured and wave detector are measured.
Claims (6)
1. seismoreceiver precision measurement system is characterized in that:
Described seismoreceiver precision measurement system comprises control device, shaking table drive unit, shaking table, vialog and signal processing apparatus;
Tested wave detector is installed on the described shaking table;
Described control device is connected with the shaking table drive unit by circuit, and the shaking table drive unit is connected with shaking table by circuit again, and tested wave detector is connected with control device by signal processing apparatus;
The vibration measuring head of described vialog is installed on the The Cloud Terrace, and the vibration signal that the vibration measuring head records is through passing through the signal processing apparatus input control device after the processing of vialog;
Control device sends signal and gives the shaking table drive unit, drive shaking table by the shaking table drive unit, the vibration of shaking table is recorded by vialog and sends control device to by signal processing apparatus then through handling, and the signal that tested wave detector of while records also sends control device to by signal processing apparatus.
2. seismoreceiver precision measurement system according to claim 1 is characterized in that:
Described control device is computing machine and IO interface;
Described vialog is a laser vibration measurer;
Described shaking table drive unit is a high precision digital-to-analog converter;
Described shaking table is the weak signal shaking table, and measurement range is 10ug-100mg;
Described signal processing device is changed to high-precision adc.
3. seismoreceiver precision measurement system according to claim 1 is characterized in that:
Described control device is computing machine and IO interface;
Described shaking table drive unit comprises high precision digital-to-analog converter and the power amplifier that is attached thereto, and power amplifier is connected with shaking table again;
Described vialog is a laser vibration measurer;
Described shaking table is strong signal shaking table, and measurement range is 10mg-10g;
Described signal processing device is changed to high-precision adc.
4. according to claim 2 or 3 described seismoreceiver precision measurement systems, it is characterized in that: described high precision digital-to-analog converter adopts 24 figure place weighted-voltage D/A converters; Described high-precision adc adopts 24 analog to digital converters.
5. according to claim 2 or 3 described seismoreceiver precision measurement systems, it is characterized in that: described laser vibration measurer adopts laser doppler vibrometer; Described computing machine adopts the quiet computing machine of no fan.
6. according to claim 2 or 3 described seismoreceiver precision measurement systems, it is characterized in that: when accurately measuring, between tested wave detector and high-precision adc, laser interferometer system is housed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205722764U CN201859225U (en) | 2010-10-22 | 2010-10-22 | Precision measuring system of seismic detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205722764U CN201859225U (en) | 2010-10-22 | 2010-10-22 | Precision measuring system of seismic detector |
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| CN201859225U true CN201859225U (en) | 2011-06-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004267A (en) * | 2010-10-22 | 2011-04-06 | 中国石油化工股份有限公司 | Precision measurement system and method of seismic detector |
| CN103513272A (en) * | 2012-06-19 | 2014-01-15 | 中国石油化工股份有限公司 | Microseism simulating and monitoring method |
| CN107238872A (en) * | 2016-03-28 | 2017-10-10 | 中国石油化工股份有限公司 | seismic sensor test system and method |
-
2010
- 2010-10-22 CN CN2010205722764U patent/CN201859225U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004267A (en) * | 2010-10-22 | 2011-04-06 | 中国石油化工股份有限公司 | Precision measurement system and method of seismic detector |
| CN102004267B (en) * | 2010-10-22 | 2014-11-19 | 中国石油化工股份有限公司 | Precision measurement system and method of seismic detector |
| CN103513272A (en) * | 2012-06-19 | 2014-01-15 | 中国石油化工股份有限公司 | Microseism simulating and monitoring method |
| CN103513272B (en) * | 2012-06-19 | 2016-05-04 | 中国石油化工股份有限公司 | A kind of microseism analog monitoring method |
| CN107238872A (en) * | 2016-03-28 | 2017-10-10 | 中国石油化工股份有限公司 | seismic sensor test system and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110608 |