CN204286459U - The superconduction full tensor magnetic gradient measure and control device that synchronization accuracy parallel calibration method uses - Google Patents

Abstract

The utility model relates to the superconduction full tensor magnetic gradient measure and control device that a kind of synchronization accuracy parallel calibration method uses, described device is by CompactRIO controller NI CRIO 9025 (1), CompactRIO reconfigurable cabinet NI CRIO 9118 (2), Delta-Sigma type ADC NI 9239A (3), Delta-Sigma type ADC NI 9239B (4), Delta-Sigma type ADC NI 9239C (5), digital I/O module NI 9402 (6), GPS combined inertial nevigation SPAN LCI (7), working environment monitoring assembly (8), SQUID sensing circuit (9) and serial communication module NI 9871 (10) form.And increase function generator 33622A (11), high-speed oscilloscope DSO9404A (12) and test signal driving circuit (13) are connected corresponding signaling interface by cable on this basis; It is simply workable that described device has realization, and to successfully developing, superconduction full tensor magnetic gradient measure and control device is significant.

Description

The superconduction full tensor magnetic gradient measure and control device that synchronization accuracy parallel calibration method uses

Technical field

The utility model relates to the superconduction full tensor magnetic gradient measure and control device that a kind of synchronization accuracy parallel calibration method uses, and belongs to superconductor applications field.

Background technology

Superconduction full tensor magnetic gradient measurements system normally carries magnetic survey equipment on the moving platform, utilize the geomagnetic anomaly information caused by magnetic mineral resources obtained in motion process, realize magnetic geology and ore body high-level efficiency, high accuracy three-dimensional over the ground to locate, and obtain their space distribution information.The features such as it is high that it has efficiency, and investigation depth is dark, and relative to traditional resultant field and component fields magnetic measurement, there is obvious advantage and the meaning across the epoch, be important development direction and the international research forward position of current magnetic air geophysical prospecting technology.

The core devices of the full tensor gradometer of composition superconduction is superconducting quantum interference device (SQUID) (SQUID:Superconducting QUantum Interference Device).SQUID is the highest Magnetic Sensor of current known sensitivity, very faint magnetic signal can be measured, and utilize SQUID measure magnetic gradient time transducer spacing little (centimetre-sized), be the unique selection realizing highly sensitive full tensor magnetic gradient measurements at present.

Measuring table due to superconduction full tensor magnetic gradient measurements system normally moves, therefore need while realizing its measuring system primary output signal synchronous acquisition, also must carry out magnetic compensation by high-precision attitude projection and cut to eliminate SQUID the interference introduced in magnetic field of the earth.Usually, good attitude projection not only needs to use high-precision GPS combined inertial nevigation, and more need the high-precise synchronization of magnetic measurement data and GPS combined inertial nevigation data to ensure, wherein with the principle that the Delta-Sigma type ADC of superconducting magnetic sensor adaptation is based on over-sampling, because its sampling clock and GPS work clock are independently, therefore the synchronism of magnetic measurement data and GPS combined inertial nevigation data cannot be ensured.

The synchronism of visible superconduction full tensor magnetic gradient measure and control device must be demarcated, also must correct in the mode of resampling if desired, and the factor usually affecting superconduction full tensor magnetic gradient measurements system synchronization precision mainly comprises: the signal response of SQUID sensing circuit postpones, the over-sampling of Delta-Sigma type ADC postpones, time delay after resampling, the digital I/O signal that receives PPS signal postpone and the synchronous error of PPS signal and position and attitude signal in GPS combined inertial nevigation, wherein most latter two factors can be ignored in the ordinary course of things.

Development superconduction full tensor magnetic gradient measurements system is of great significance the construction of national mineral resources security system and the equal tool of the national economic development, but China is in this field at present, except the special project of " the aviation superconduction full tensor magnetic gradient measurements device " presided over by state revenue portion great instrument that Shanghai Inst. of Microsystem and Information Technology, Chinese Academy of Sci bears, not yet carry out any relevant research, though and abroad have and rarely have similar device, but have no the play-by-play of correlation technique, more cannot know the concrete details that superconduction full tensor magnetic gradient measure and control device synchronization accuracy is demarcated, the reference thus its synchronization accuracy scaling method is had no way of.

In sum, there is not yet the open report about the efficient scaling method on superconduction full tensor magnetic gradient measure and control device and GPS combined inertial nevigation data and magnetic measurement data syn-chronization precision at home and abroad, and be ensure that superconduction full tensor magnetic gradient measurements system really can become validity, a kind of practicable efficient scaling method is proposed most important.

Utility model content

The purpose of this utility model is the superconduction full tensor magnetic gradient measure and control device providing a kind of synchronization accuracy parallel calibration method to use, to solve the problem of calibrating of superconduction full tensor magnetic gradient measure and control device synchronization accuracy, the utility model for the situation can ignoring GPS combined inertial nevigation pps pulse per second signal PPS and position and attitude signal synchronous error, thus provide a kind of can the high-efficiency superconducting full tensor magnetic gradient measure and control device synchronization accuracy scaling method of parallel measurement.Described method can not only provide the synchro measure precision of ten Microsecond grades, and can also the synchronization accuracy of all tested passages of parallel measurement superconduction full tensor magnetic gradient measure and control device.Described parallel calibration refers to that superconduction full tensor magnetic gradient measure and control device synchronization accuracy is demarcated, and can be corridorbarrier function one by one, also can be disposable whole demarcation.

The utility model solves the technical scheme that its technical matters adopts: the measure and control device of superconduction full tensor magnetic gradient measurements system forms primarily of SQUID sensing circuit, data gathering and communication assembly, movement position and attitude information record component, working environment monitoring assembly and human interface components, and wherein movement position and the attitude information record component GPS of employing combined inertial nevigation (such as the SPAN-LCI of Canadian NovAtel company) realize more.For solving sampling clock and the incoherent problem of gps clock of Delta-Sigma type ADC in data gathering and communication assembly, first adopt digital phase-locked loop to produce the clock of resampling to GPS combined inertial nevigation pps pulse per second signal PPS frequency multiplication, then utilize counter to obtain the phase relation of ADC sampling clock and resampling clock thus the resampling completed original signal; Read the precision time service time of now GPS subsequently by serial ports when receiving PPS signal, finally merge with the position with timestamp stored in GPS combined inertial nevigation and attitude information again realize afterwards synchronous.Visible, the factor affecting superconduction full tensor magnetic gradient measure and control device synchronization accuracy comprises: the signal response of SQUID sensing circuit postpones, the over-sampling of Delta-Sigma type ADC postpones, time delay after resampling, the digital I/O signal receiving PPS signal postpones and the synchronous error of PPS signal and position and attitude signal in GPS combined inertial nevigation, and the synchronization accuracy of superconduction full tensor magnetic gradient measurements system requirements in common application is at ten musec order, therefore can not consider in the ordinary course of things the factor of latter two time delay below a microsecond, namely magnetic measurement data only synchronously with the pps pulse per second signal PPS of GPS need can meet the synchronous requirement with movement position and attitude data.

In view of magnetic measurement data only need the attitude projection requirements that can meet generally superconduction full tensor magnetic gradient measurements system synchronous with the pps pulse per second signal PPS of GPS combined inertial nevigation, therefore described method first utilize PPS signal produce one with the zero phase sine wave signal of its rising edge synch; Then the Test interface of all SQUID sensing circuits in superconduction full tensor magnetic gradient measure and control device is input to respectively by driving circuit, and in the information of the above-mentioned all superconducting magnetic Measurement channel of whole time triggered collection second of specifying after SQUID normally works; Measure the phase place of this sampled data all magnetic measurements channel signal after whole time second subsequently, also the collection signal of all magnetic measurement passages can be divided into N number of whole number of seconds certificate, ask arithmetic mean abandoning first whole number of seconds according to their phase place of rear measurement; Finally these phase transition be positive number and be converted into the synchronization accuracy that the time corresponding with it can obtain superconduction full tensor magnetic gradient measure and control device, thus completing relevant staking-out work.

Based on the principle of work of method described in the utility model, the device adopting described method to build generally includes high-speed oscilloscope, function generator, the test signal driving circuit of customization and the measure and control device of system under test (SUT), and these assemblies forming caliberating device are all independently, there is no fixing structural union, operationally only need connect corresponding signaling interface by cable.

For produce one with the zero phase sine wave signal of the PPS signal rising edge synch of GPS integrated navigation, first can be connected to the external trigger interface of function generator with the bi-directional digital I/O port receiving PPS signal digital IO concurrent working; Then when receiving PPS signal digital IO and the PPS signal rising edge gathered by time triggered Delta-Sigma type ADC being detected, simultaneously the digital I/O port (needing programming in the program of former measure and control device to increase this function) that is connected of the external trigger interface of set function generator, makes function generator export the zero phase sine wave signal synchronous with it.For monitoring PPS signal and the synchronism of sine wave output signal, the synchronism output of PPS signal and this sine wave signal is connected to respectively two passages of high-speed oscilloscope, measures their time delay.In addition, if necessary, by this time delay of Time delay function compensation of function generator.

In view of full tensor magnetic gradient has 5 isolated components, for compensating the degree of unbalancedness of gradiometer and ensureing gradient information redundancy, superconduction full tensor magnetic gradient measure and control device can comprise 9 superconducting magnetic sensors usually, namely needs 9 SQUID sensing circuits.Consider that the Test function of SQUID sensing circuit drives the Feedback coil on SQUID side to realize by external signal, for letter of guarantee number generator exports and for the electromagnetic compatibility between the driving force of sine wave signal of testing and SQUID sensing circuit, utilize and drive them for the Feedback coil of Test respectively with the voltage follower of SQUID sensing circuit number equity, wherein voltage follower is the test signal driving circuit of customization, design based on high speed operation amplifier, and adopt star topology identical to ensure the time delay of each passage.

After completing above-mentioned work, first complete for superconduction tensor magnetic gradient measurements system is placed in magnetic shield room, and Tuning function generator makes it be in wait external trigger state; Then after regulating the running parameter of SQUID sensing circuit to make them normally work, Delta-Sigma type ADC in fixed time trigger data acquisition and communication part in units of whole second, produces the zero phase sine wave signal with PPS signal rising edge synch by Digital I/O trigger function generator simultaneously; Record the resampling data of all superconducting magnetic Measurement channel subsequently, and measure the phase place of this sampled data all magnetic measurements channel signal after whole time second or this sampled signal be divided into N number of whole number of seconds certificate, ask arithmetic mean abandoning first whole number of seconds according to their phase place of rear measurement, the reason abandoning foremost one piece of data here in units of whole second is caused by the principle of work of Delta-Sigma type ADC; Finally by these phase places (if be negative, then need to be converted to positive number) be converted into the time corresponding with it, conversion method is: phase place divided by after 360 again divided by the frequency of function generator sine wave output signal, namely obtain the synchronization accuracy of the superconduction full tensor all magnetic measurement channel datas of magnetic gradient measure and control device and GPS combined inertial nevigation data by parallel measurement, thus complete relevant staking-out work.

It should be noted that, if when the full tensor magnetic gradient measure and control device synchronization accuracy of demarcation superconduction, need directly to use test data to extract phase information, several seconds (as 2 seconds) before the triggering collection time can specified in units of whole second, the external trigger function of function generator is used to produce the zero phase sine wave signal with GPS integrated navigation PPS signal rising edge synch in advance, but zero phase sine wave signal frequency now must be positive integer, then gather according to the method described above and can avoid the disabled situation of foremost image data, namely do not need to abandon first whole number of seconds certificate again.

The beneficial effects of the utility model are, the utility model proposes a kind of superconduction full tensor magnetic gradient measure and control device synchronization accuracy scaling method efficiently, the synchro measure precision of ten Microsecond grades not only can be provided, and can also the synchronization accuracy of all tested passages of parallel measurement superconduction full tensor magnetic gradient measure and control device, and the device can demarcated according to described method fast construction.In addition, the described device built by method described in the utility model, realize simple, with low cost, workable, to successfully developing, superconduction full tensor magnetic gradient measure and control device is significant.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Fig. 1 is the hardware block diagram of superconduction full tensor magnetic gradient core measure and control device.

Fig. 2 is the hardware block diagram demarcating superconduction full tensor magnetic gradient measure and control device.

Fig. 3 is the hardware block diagram of the test signal driving circuit of customization.

1.CompactRIO controller NI CRIO 9025 in figure, the reconfigurable cabinet NICRIO 9118 of 2.CompactRIO, 3.Delta-Sigma type ADC NI 9239A, 4.Delta-Sigma type ADC NI 9239B, 5.Delta-Sigma type ADC NI 9239C, 6. digital I/O module NI 9402, 7.GPS combined inertial nevigation SPANLCI, 8. working environment monitoring assembly, 9.SQUID sensing circuit, 10. serial communication module NI 9871, 11. function generator 33622A, 12. high-speed oscilloscope DSO9404A, the test signal driving circuit of 13. customizations, 14. voltage followers.

Embodiment

For making the purpose of this utility model, concrete scheme and advantage more clear, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.

Superconduction involved by the utility model full tensor magnetic gradient measure and control device forms primarily of CompactRIO controller NI CRIO 9,025 1, CompactRIO reconfigurable cabinet NI CRIO 9,118 2, Delta-Sigma type ADC NI 9239A 3, Delta-Sigma type ADC NI 9239B 4, Delta-Sigma type ADC NI9239C 5, digital I/O module NI 9,402 6, GPS combined inertial nevigation SPAN LCI 7, working environment monitoring assembly 8, SQUID sensing circuit 9 and serial communication module NI 9,871 10, and its block diagram as shown in Figure 1.Wherein Delta-Sigma type ADC NI 9239A 3, Delta-Sigma type ADC NI 9239B 4, Delta-Sigma type ADC NI 9239C 5, serial communication module NI 9,871 10 and digital I/O module NI9402 6 is all C series modules of National Instruments company standard, insert in the slot of CompactRIO reconfigurable cabinet NI CRIO 9,118 2 correspondence, and could normally work form complete CompactRIO development platform together with CompactRIO controller NI CRIO9025 1 after, this platform is that National Instruments company provides and for the standard modular product of observing and controlling, GPS combined inertial nevigation SPAN LCI 7 is for obtaining flight position and the attitude information of superconducting magnetic measurement components, its pps pulse per second signal PPS exported is connected with a port of digital I/O module NI 9,402 6 by coaxial cable, and it exports the time service time, the interface of the information such as position and attitude is then connected with a RS422 port of serial communication module NI 9,871 10, when system worked well, first digital phase-locked loop is adopted to produce the clock of resampling to GPS combined inertial nevigation SPAN LCI 7 pps pulse per second signal PPS frequency multiplication, then the FPGA on CompactRIO reconfigurable cabinet NI CRIO 9,118 2 backboard is utilized to obtain the phase relation of ADC sampling clock and resampling clock thus the resampling completed SQUID sensing circuit 9 raw measured signal in the mode of counter, read the precision time service time of now GPS subsequently by serial ports when receiving PPS signal, finally merge with the position with timestamp stored in GPS combined inertial nevigation SPAN LCI 7 and attitude information again realize afterwards synchronous.Working environment monitoring assembly 8, for measuring the auxiliary quantity of superconduction full tensor magnetic gradient measure and control device, comprises the parameters such as humiture, air pressure, liquid helium liquid level, and crosses RS485 interface and serial communication module NI 9,871 10 adaptation; SQUID sensing circuit 9 is for realizing the conversion of tested magnetic field to electricity, traditional flux locked loop mode of operation of employing standard, totally 9 passages, front 4 passages are one group of four passage being connected to Delta-Sigma type ADC NI9239A 3 respectively, ensuing 4 passages are four passages that another group is connected to Delta-Sigma type ADC NI 9239B 4 respectively, a remaining passage is then connected to Delta-Sigma type ADC NI9239C 5, and by with an adaptation in the residue RS485 interface of serial communication module NI 9,871 10 to realize controlling.

According to the principle of work of above-mentioned superconduction full tensor magnetic gradient measure and control device, as follows by calculating known factor affect superconduction full tensor magnetic gradient measure and control device synchronization accuracy in the common application (such as measuring accuracy is the aviation superconduction full tensor magnetic gradient measurements device of 0.05nT/m): the time delay t3 after over-sampling delay t2, CompactRIO reconfigurable cabinet NI CRIO 9,118 2 that the signal response of SQUID sensing circuit 9 postpones t1, Delta-Sigma type ADC NI 9239 carries out resampling.

In view of magnetic measurement data only need the attitude projection requirements that can meet generally superconduction full tensor magnetic gradient measurements system synchronous with the pps pulse per second signal PPS of GPS combined inertial nevigation SPAN LCI 7, therefore described method utilize PPS signal produce one with the zero phase sine wave signal of its rising edge synch; Then be input to 9 Test ports (each passage of SQUID sensing circuit 9 has a Test interface) of SQUID sensing circuit 9 in the full tensor of superconduction shown in Fig. 1 magnetic gradient measure and control device respectively by the test signal driving circuit 13 of customization, and gather the information of 9 superconducting magnetic Measurement channel in the time triggered whole second of specifying after SQUID normally works; Measure the phase place of this sampled data 9 magnetic measurement channel signals after whole time second (as 2 seconds) subsequently, also the collection signal of 9 magnetic measurement passages can be divided into N number of whole second (as 2 seconds) data, ask arithmetic mean abandoning first whole number of seconds according to their phase place of rear measurement; Finally these phase transition be positive number and be converted into the time corresponding with it, the synchronization accuracy of the full tensor magnetic gradient of superconduction shown in Fig. 1 measure and control device can be obtained, thus complete relevant staking-out work.

In sum, adopt device that described method builds as shown in Figure 2, comprise function generator 33622A11, high-speed oscilloscope DSO9404A 12, the test signal driving circuit 13 of customization and the superconduction full tensor magnetic gradient measure and control device shown in Fig. 1, and these assemblies adopting described method to build caliberating device are all independently, there is no fixing structural union, Fig. 2, as an embodiment, operationally only need connect corresponding signaling interface by cable as shown in Figure 2.

Wherein a) function generator (11) is connected with digital I/O module NI 9402 (6);

B) high-speed oscilloscope CH1 end is connected to digital I/O module (6) and exports on coaxial cable that pps pulse per second signal PPS is connected; Other end CH2 then function generator (11) connects;

One end function generator of the test signal driving circuit (13) c) customized is connected, and the other end is then held with the Test of SQUID sensing circuit and is connected.

The utility model produces with zero phase sine wave signal (such as frequency the is 1KHz) method of the PPS signal rising edge synch of GPS combined inertial nevigation SPAN LCI 7 as follows: the external trigger interface first another the digital I/O port CH2 in digital I/O module NI 9,402 6 except receiving PPS signal digital I/O port CH1 being connected to function generator 33622A 11; Then make reception PPS signal digital I/O port CH1 when the PPS signal rising edge gathered by time triggered Delta-Sigma type ADC NI 9239 being detected by programming in the program of former measure and control device, the digital I/O port CH2 that set function generator 33622A 11 external trigger interface is connected, thus utilize the external trigger function of function generator 33622A 11 (rising edge triggering) to export the zero phase sine wave signal synchronous with it.For monitoring PPS signal and the synchronism of sine wave output signal, the synchronism output of PPS signal and this sine wave signal is connected to respectively two channel C H1 and CH2 of high-speed oscilloscope DSO9404A 12, measures their time delay.In addition, if necessary, by this time delay of Time delay function compensation of function generator 33622A 11.

The full tensor magnetic gradient of superconduction shown in Fig. 1 measure and control device comprises 9 superconducting magnetic sensors, namely needs 9 SQUID sensing circuits.Consider that the Test function of SQUID sensing circuit 9 drives the Feedback coil on SQUID side to realize by external signal, for letter of guarantee number generator 33622A 11 exports and for the electromagnetic compatibility between the driving force of sine wave signal of testing and each passage of SQUID sensing circuit 9, the test signal driving circuit 13 comprising the customization of 9 normal voltage followers 14 is utilized to drive them for the Feedback coil of Test respectively, wherein voltage follower 14 designs based on ADI company of U.S. high speed operation amplifier AD8021, adopt and adopt star topology identical to ensure the time delay of each passage, its hardware block diagram as shown in Figure 3.

After completing above-mentioned work, the core link that superconduction full tensor magnetic gradient measure and control device synchronization accuracy is demarcated can be entered.First the superconduction full tensor magnetic gradient measurements system of demarcating will be needed to be placed in magnetic shield room, and adjustment card function generator 33622A 11 make it be in wait external trigger state; Then after regulating the running parameter of SQUID sensing circuit 9 to make them normally work, Delta-Sigma type ADC NI 9239A 3, Delta-Sigma type ADC NI 9239B 4 and Delta-Sigma type ADC NI 9239C 5 in fixed time (after such as 30 seconds) trigger data acquisition and communication part in units of whole second, and be recorded in function generator 33622A 11 and trigger the data after exporting the resampling of rear 9 superconducting magnetic Measurement channel; Measure subsequently this sampled data 9 magnetic measurement channel signals after whole time second (as 2 seconds) phase place or this sampled signal is divided into N number of whole second (as 2 seconds) data, ask arithmetic mean abandoning first whole number of seconds according to their phase place of rear measurement, the reason abandoning foremost one piece of data here in units of whole second is caused by the principle of work of Delta-Sigma type ADC; Finally by these phase places (if be negative, then need to be converted to positive number) be converted into the time corresponding with it, conversion method is: phase place divided by after 360 again divided by the frequency of function generator 33622A 11 sine wave output signal, namely obtain the synchronization accuracy of 9 magnetic measurement channel datas and GPS combined inertial nevigation SPAN LCI7 data in the full tensor magnetic gradient of superconduction shown in Fig. 1 measure and control device by parallel measurement, thus complete relevant staking-out work.

Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (3)

1. a superconduction full tensor magnetic gradient measure and control device for the parallel calibration method use of synchronization accuracy, is characterized in that:

1. involved superconduction full tensor magnetic gradient measure and control device is primarily of CompactRIO controller NICRIO 9025 (1), CompactRIO reconfigurable cabinet NI CRIO 9118 (2), Delta-Sigma type ADC NI 9239A (3), Delta-Sigma type ADC NI 9239B (4), Delta-Sigma type ADC NI 9239C (5), digital I/O module NI 9402 (6), GPS combined inertial nevigation SPAN LCI (7), working environment monitoring assembly (8), SQUID sensing circuit (9) and serial communication module NI 9871 (10) form, wherein, Delta-Sigma type ADC NI 9239A (3), Delta-Sigma type ADC NI 9239B (4), Delta-Sigma type ADC NI 9239C (5), serial communication module NI 9871 (10) and digital I/O module NI 9402 (6) is all C series modules of National Instruments company standard, insert in slot corresponding to CompactRIO reconfigurable cabinet NI CRIO 9118 (2), and form complete CompactRIO development platform together with CompactRIO controller NI CRIO 9025 (1) after, this platform is that National Instruments company provides and for the standard modular product of observing and controlling, GPS combined inertial nevigation SPAN LCI (7) is for obtaining flight position and the attitude information of superconducting magnetic measurement components, its pps pulse per second signal PPS exported is connected with a port of digital I/O module NI 9402 (6) by coaxial cable, and it exports the time service time, the interface of position and attitude information is then connected with a RS422 port of serial communication module NI9871 (10), working environment monitoring assembly (8) comprises humiture, air pressure or liquid helium level parameter auxiliary quantity for what measure superconduction full tensor magnetic gradient measure and control device, and cross RS485 interface and serial communication module NI 9871 (10) adaptation, SQUID sensing circuit (9) is for realizing the conversion of tested magnetic field to electricity, traditional flux locked loop mode of operation of employing standard, totally 9 passages, front 4 passages are one group of four passage being connected to Delta-Sigma type ADC NI 9239A (3) respectively, ensuing 4 passages organize for another four passages being connected to Delta-Sigma type ADC NI 9239B (4) respectively, a remaining passage is then connected to Delta-Sigma type ADC NI 9239C (5), and by with an adaptation in the residue RS485 interface of serial communication module NI 9871 (10) to realize controlling,

2., on 1. described measure and control device basis, increase function generator 33622A (11), high-speed oscilloscope DSO9404A (12) and test signal driving circuit (13) and be connected corresponding signaling interface by cable;

Wherein a) function generator (11) is connected with digital I/O module NI 9402 (6);

B) high-speed oscilloscope CH1 end is connected to digital I/O module (6) and exports on coaxial cable that pps pulse per second signal PPS is connected; Other end CH2 then function generator (11) connects;

One end function generator of the test signal driving circuit (13) c) customized is connected, and the other end is then held with the Test of SQUID sensing circuit and is connected.

2. by device according to claim 1, the test signal driving voltage (13) that it is characterized in that comprising 9 voltage followers (14) drives them should the Feedback coil of Test respectively, exports and for electromagnetic compatibility between the driving of testing sine wave signal and SQUID sensing circuit (9) each passage with letter of guarantee number generator 33622A (11).

3., by device according to claim 2, it is characterized in that:

1. 9 voltage followers (14) that test signal driving circuit (13) comprises adopt star topology, identical to ensure each channel delay;

2. described voltage follower (14) is designed by ADI company of U.S. high speed operation amplifier AD8021.