WO2010123183A1 - 다채널 squid신호의 데이터 획득 시스템 - Google Patents
다채널 squid신호의 데이터 획득 시스템 Download PDFInfo
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- WO2010123183A1 WO2010123183A1 PCT/KR2009/006424 KR2009006424W WO2010123183A1 WO 2010123183 A1 WO2010123183 A1 WO 2010123183A1 KR 2009006424 W KR2009006424 W KR 2009006424W WO 2010123183 A1 WO2010123183 A1 WO 2010123183A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
- G01R33/0354—SQUIDS
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
Definitions
- the present invention relates to a data acquisition system, and more particularly to a data acquisition system for a multichannel SQUID signal.
- SQUID Superconducting Quantum Interference Device
- bio sensors such as high sensitivity magnetic flux meter or core and brain magnetic measurement.
- SQUID sensors measure fine magnetic fields and are placed in a liquid helium dew placed in a magnetically shielded room (MSR) or a radio-frequency shielded room (RFSR), and the magnetocardiography (MCG) from the human body.
- MMR magnetically shielded room
- RFSR radio-frequency shielded room
- MCG magnetocardiography
- B Measure the magnetoencephalography (MEG).
- the signal sensed by the SQUID sensor appears as a weak voltage signal, so it is amplified and linearized in a flux-locked loop (FLL) circuit and sent out of the enclosure.
- FLL flux-locked loop
- Signals exiting the shielded room through the conductors are signaled by the analog signal processor (ASP) for analysis of the core or brain map and then sent to a data acquisition board for input to a computer.
- ASP analog signal processor
- FIG. 1 is a diagram illustrating a data acquisition system of a multi-channel SQUID signal using an analog signal processing system and a DAQ board.
- SQUID sensor unit 110 SQUID sensor unit 110, FLL (flux-locked loop) circuit unit 120, conducting wire 130, analog signal processing unit 150, filter unit 160, DAQ board 170 and computer 180 .
- FLL frlux-locked loop
- the SQUID sensor unit 110 is located in the liquid helium dewar 113 in the shielding chamber 190, and 160 SQUID sensors are driven.
- the FLL circuit unit 120 includes ten FLL circuit modules 120-1, 120-2 to 120-9, 120-10, and the FLL circuit modules 120-1, 120-2 to 120-9, 120-10 each have 16 FLL circuits. And an output unit 123, and the FLL circuit 121 amplifies and linearizes the signal measured from the SQUID sensor unit 110 in the shielding chamber 190 and through the output unit 123. 130).
- One FLL circuit 121 is connected to each SQUID sensor, and sixteen FLL circuits 121 become one module.
- 10 FLL circuit modules 120-1, 120-2 to 120-9, 120-10 connected with 16 channels are required. 170 wires are needed, the number of SQUID sensors and the number of ground wires in each module.
- the analog signal processor 150 is located in the shield room 140 and includes an analog signal processor 151 and a DC power supply unit 153.
- the analog signal processing module 151 includes a high pass filter 155, a voltage amplifier 156, a low pass filter 157, and a 60 Hz notch filter 158 for each channel, and in the FLL circuit unit 120.
- the amplified and linearized signal is input through the conducting wire 130 and signal processed to match the core or brain.
- the DC power supply unit 153 is installed in the shield room 140 to prevent external noise from flowing in.
- the signal processed by the analog signal processor 150 is sent to the plurality of DAQ boards 170 through the filter unit 160.
- the DAQ board 170 converts the input analog signal into a digital signal and sends it to the computer 180.
- 160 SQUID sensors are driven, either two DAQ boards with 80-channel voltage inputs or three DAQ boards with 64-channel voltage inputs are used.
- the computer 180 stores the converted digital signal or outputs the SQUID signal using application software.
- the data acquisition system of multi-channel SQUID signal using analog signal processing system and DAQ board is connected to the analog signal processing unit outside the shield room containing SQUID sensor through the number of SQUID sensors and the number of conductors including ground wire. As it causes noise to enter inside, it is difficult to obtain accurate data.
- the multiple wires and the ground wires inside and outside the shielding room are combined with each other to form multiple closed circuits, thereby becoming another noise source.
- the signal output from the FLL circuit portion is still small in size, so the analog signal processing system used to obtain only the necessary signals increases manufacturing costs, increases installation area, and is another source of noise for SQUID sensors.
- the DAQ board creates a closed loop between each other to create noise, and the sampling time of each channel decreases as the number of channels used increases.
- An object of the present invention is to provide a data acquisition system for a multi-channel SQUID signal that does not generate an external noise inflow or closed-loop noise due to the connection of a plurality of conductors and ground lines and does not require an analog signal processing system.
- a superconducting quantum interference device SQUID
- a digital conversion unit for generating a channel-voltage serial digital signal having information about the voltage signal, and a data acquisition system for a multi-channel squid signal including an optical fiber cable for transmitting the channel-voltage serial digital signal from the digital conversion unit.
- a channel connected to a squid sensor having a plurality of channels, the channel having information on the voltage signal and information on the channel from which the voltage signal is output from the voltage signal output from the plurality of channels;
- a multi-channel squid including a digital conversion unit including a plurality of digital conversion modules for generating a voltage serial digital signal and as many optical fiber cables as the number of the digital conversion modules for transmitting the channel-voltage serial digital signal from the digital conversion unit.
- a squid sensor having a plurality of channels located in a shielded room that blocks electromagnetic or electromagnetic waves and outputs a voltage signal to receive the voltage signal output from the plurality of channels to receive the voltage signal
- a digital converter for generating a channel-voltage serial digital signal having information about a channel and an information on the voltage signal, and an optical fiber for transmitting the channel-voltage serial digital signal from the digital converter to the outside of the shielded room.
- a data acquisition system of a multichannel squid signal comprising a cable.
- a voltage signal output from a squid sensor having a plurality of channels in a shielded room that blocks electromagnetic or electromagnetic waves has information on a channel from which the voltage signal is output and information on the voltage signal.
- Accurate data can be obtained because there is no external noise inflow or closed loop noise caused by the connection of many conductors and ground wires.
- No analog signal processing system (ASP) is required, simplifying configuration, reducing manufacturing costs, and eliminating noise from the analog signal processing system and the closed circuit between the analog signal processing system and the DAQ board.
- the single DIO board accepts signals from all channels, eliminating the need for more DIO boards up to 256 channels and reducing measurement sampling time to 256 channels.
- the same software filter is used for all channels, so the characteristics of the signaled outputs are all the same, ensuring uniformity according to signal processing.
- FIG. 1 is a diagram illustrating a data acquisition system of a multi-channel SQUID signal using an analog signal processing system and a DAQ board.
- FIG. 2 is a block diagram illustrating an example of a data acquisition system 1000 of 160 channel SQUID signals according to the present embodiment.
- FIG. 3 is a block diagram illustrating an example of an FLL / HPF / AMP circuit module according to the present embodiment.
- FIG. 4 is a block diagram illustrating an example of a channel-voltage transmission module and a single wire serial data conversion module according to the present embodiment.
- FIG. 5 is a diagram showing generation of a channel-voltage serial short pulse digital signal in a single wire serial data conversion module according to the present embodiment.
- FIG. 6 is a block diagram illustrating an example of a channel-voltage receiving module according to the present embodiment.
- FIG. 7 is a diagram showing generation of a channel-voltage serial digital signal in a channel-voltage receiving module according to the present embodiment.
- FIG. 8 is a diagram illustrating a channel-voltage receiving module and a shot serial-synchronized transfer module according to the present embodiment.
- FIG. 9 illustrates a shot serial-sync transfer module, a DIO board, and a computer according to the present embodiment.
- FIG. 10 is a diagram illustrating time division of ten modules for synchronization in the shot serial-synchronized transfer module according to the present embodiment.
- ordinal numbers such as second and first
- first and second components may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
- FIG. 2 is a block diagram illustrating an example of a data acquisition system 1000 of 160 channel SQUID signals according to the present embodiment.
- the SQUID signal data acquisition system 1000 includes a shielded room 100, a SQUID sensor unit 200, a digital conversion unit 300, an optical fiber cable 400, and a channel-voltage receiving module 500.
- the SQUID sensor unit 200 has 160 channels and is located in the liquid helium dewar 210 placed in the shielding room 100 to measure a magnetic field diagram (MCG) or a brain diagram (MEG) from the human body and output a voltage signal.
- the shielded room 100 may be a magnetically shielded room (MSR) or a radio-frequency shielded room (RFSR).
- the digital conversion unit 300 includes ten digital conversion modules 300-1, 300-2 to 300-9, 300-10, and converts a voltage signal output from the SQUID sensor unit 200 into a series having channel and voltage value information. serial) to a digital signal.
- the digital conversion module 300-1,300-2 to 300-9,300-10 includes 16 flux-locked loop (FLL) / high-pass filter (HPF) / amplifier (AMP) circuit modules 310 and a channel-voltage transmission module. 330 and the single wire serial data conversion module 350.
- FLL flux-locked loop
- HPF high-pass filter
- AMP amplifier
- the FLL / HPF / AMP circuit module 310 amplifies and linearizes the voltage signal output from the SQUID sensor unit 200 and sends it to the channel-voltage transmission module 330.
- the channel-voltage transfer module 330 amplifies and converts the linearized voltage signal into a serial digital signal having channel and voltage value information.
- the single wire serial data conversion module 350 combines a clock signal with a serial digital signal having channel and voltage value information to generate a channel-voltage serial short pulse digital signal.
- the optical fiber cable 400 is a channel in which 10 optical fiber cables 400 according to 10 digital conversion modules 300-1, 300-2 to 300-9, 300-10 are used for the 160 channel SQUID sensor unit 200.
- a voltage serial short pulse digital signal is transmitted out of the shielded room 100 and sent to the channel-voltage receiving module 500.
- the number of optical fiber cables 400 may be equal to the number of digital conversion modules.
- the channel-voltage receiving module 500 receives the channel-voltage serial short pulse digital signal transmitted through the optical fiber cable 400, extracts the channel-voltage serial digital signal and the clock signal, and extracts the extracted channel-voltage serial digital signal. To the shot serial-sync transfer module 600.
- the shot serial-synchronized transfer module 600 time-divisions and sequentially rearranges the channel-voltage serial digital signal to convert it into a channel-voltage parallel digital signal.
- the DIO board 700 receives the channel-voltage parallel digital signal and sends it to the computer 800.
- 'channel-voltage' indicates that it includes both channel and voltage value information.
- Computer 800 may have application software for acquiring data.
- the computer 800 receives and stores channel-voltage digital signals or extracts channel and voltage value information using application software.
- FIG. 3 is a block diagram illustrating an example of an FLL / HPF / AMP circuit module according to the present embodiment.
- the SQUID sensor unit 200 receives and drives a current from the FLL / HPF / AMP circuit module 310-1 and sends a weak voltage signal to the FLL / HPF / AMP circuit module 310-1.
- the FLL / HPF / AMP circuit module 310-1 includes an FLL circuit module 311-1 and an HPF / AMP circuit module 313-1.
- the FLL / HPF / AMP circuit module 310-1 may be manufactured by using a printed circuit board (PCB) of the FLL circuit module 311-1 and the HPF / AMP circuit module 313-1.
- PCB printed circuit board
- the FLL circuit module 311-1 includes a digital control interface module 311a-1 and linearizes a voltage signal output from the SQUID sensor unit 200.
- the FLL circuit module 311-1 may be adjusted by an adjustment signal output from a computer.
- the digital regulation interface module 311a-1 outputs a switch regulation signal and a voltage regulation signal.
- the HPF / AMP circuit module 313-1 may be configured as one op-amp, and removes the DC offset of the voltage signal output from the FLL circuit module 311-1 and removes the voltage signal. Amplify. Operating the HPF / AMP circuit module 311-1 can output amplified output signal from the FLL circuit module 311-1 approximately 100 times past the high pass filter (HPF).
- the FLL / HPF / AMP circuit module 310-1 may be manufactured by adding the HPF / AMP circuit module 313-1 with the conventional FLL circuit part mounted on the PCB.
- the HPF / AMP circuit module 313-1 may operate as part of a conventional analog signal processor, and the low pass filter (LPF) and the 60 Hz notch filter may be configured as software filters in a computer.
- the high pass frequency and the amplification rate of the HPF / AMP circuit module 313-1 may be determined by the component value of the filter circuit.
- FIG. 4 is a block diagram illustrating an example of a channel-voltage transmission module and a single wire serial data conversion module according to the present embodiment.
- the channel-voltage transmission module 330 includes an analog switch 331, a first analog-digital converter 332, a second analog-digital converter 333, a clock generator 334, and a counter 335. ), A module classifier 336, and a parallel-to-serial converter 337, and amplify and convert the linearized voltage signal into a serial digital signal having channel and voltage value information.
- the analog switch 331 sequentially selects 16 channels of the SQUID sensor unit 200 and alternately converts a voltage signal output from the selected channel to the first analog-digital converter 332 and the second analog-digital converter 333. send.
- the first analog-to-digital converter 332 and the second analog-to-digital converter 333 convert the voltage signal output from the selected SQUID sensor unit 200 into a serial digital signal.
- the second analog-to-digital converter 333 converts the voltage read from the previous channel into a digital signal while the first analog-to-digital converter 332 reads the voltage of the input voltage signal.
- the analog-to-digital converter may be configured as the first analog-to-digital converter 332 and the second analog-to-digital converter 333 to halve the time required to digitize the voltage signal from each channel.
- the clock generator 334 and the counter 335 output a clock signal and a synchronization signal for operating the first analog-to-digital converter 332 and the second analog-to-digital converter 333 to output the first analog-to-digital converter 332.
- a 4-bit parallel digital signal which is an analog switch operation signal that causes the analog switch 331 to select a channel, to the parallel-to-serial converter 337.
- the module classifier 336 generates a module fractionation signal, which is a 4-bit parallel digital signal that enables each digital conversion module to be classified, and sends it to the parallel-to-serial converter 337.
- the parallel-to-serial converter 337 converts the analog switch operation signal and the module classification signal into a serial signal, and converts the converted analog switch operation signal and the module classification signal into the first analog-to-digital converter 332 and the second analog-to-digital converter ( 333 is combined with the serial digital signal outputted from 333 to convert the channel-voltage serial digital signal. If the first analog-to-digital converter 332 and the second analog-to-digital converter 333 have 16-bit resolution, they output a 24-bit channel-voltage serial digital signal.
- the single wire serial data conversion module 350 includes a time delay unit 351, a first short pulse generator 352, a second short pulse generator 353, and an OR gate unit 354.
- the clock signal is coupled to the channel-voltage serial digital signal output from 330.
- the time delay 351 synchronizes the channel-voltage serial digital signal with the clock signal output from the clock generator 334.
- the first short pulse generator 352 and the second short pulse generator 353 output short pulse signals having different durations according to the channel-voltage serial digital signal, and send them to the OR gate unit 354.
- the first short pulse generator 352 outputs a pulse signal having a clock time duration T 0 when the channel-voltage serial digital signal is low, and a clock signal duration when the channel-voltage serial digital signal is high. 2T 0 output pulse signal.
- the OR gate unit 354 generates a channel-voltage serial short pulse digital signal by combining the channel-voltage serial digital signal with the short pulse signal output according to the channel-voltage serial digital signal to shield the room through the optical fiber cable 400. Send out.
- FIG. 5 is a diagram showing generation of a channel-voltage serial short pulse digital signal in a single wire serial data conversion module according to the present embodiment.
- the DT when the channel-voltage serial digital signal 1110 is low, when the clock signal 1120 is input, the DT becomes high in the D-type flip / flop of the first short pulse generator 352. The output continues high in proportion to the number of NOT gates and then drops to low. The pulse duration is determined by the number of D-type flip / flop outputs and the number of NOT gates connected to the clear terminal. However, when the channel-voltage serial digital signal 1110 is low, the DT appears as low in the second short pulse generator 353 and the output does not react even when the clock signal 1120 is input.
- the DT becomes high in the D-type flip / flop of the second short pulse generator 353 and the output is the number of NOT gates. Continues high in proportion to and then falls to low.
- the number of NOT gates in the second short pulse generator 353 is 2N 0 which is twice the number N 0 of NOT gates in the first short pulse generator 352, the response pulse duration is doubled.
- the DT of the first short pulse generator 352 is low and the output has low without change.
- Combining the output of the first short pulse generator 352 and the second short pulse generator 353 produces a pulse with a 2N 0 duration when the channel-voltage serial digital signal 1110 is high, and the channel-voltage When the serial digital signal 1110 is low, it generates a pulse with N 0 duration.
- the channel-voltage serial short pulse digital signal is transmitted through the optical fiber cable 400 and then restored to the channel-voltage serial digital signal 1110 and the clock signal 1120.
- FIG. 6 is a block diagram illustrating an example of a channel-voltage receiving module according to the present embodiment.
- the channel-voltage receiving module 500 includes the digital time delay unit 510, the MUX 520, the clock restorer 530, the counter 540, the serial-to-parallel converter 550, and the parallel- A serial converter 560 and an AND gate portion 570.
- the channel-voltage receiving module 500 receives the channel-voltage serial short pulse digital signal transmitted through the optical fiber cable 400 and extracts the channel-voltage serial digital signal and the clock signal from the channel-voltage serial short pulse digital signal. . The extracted channel-voltage serial digital signal is then sent to the shot serial-sync transfer module 600.
- the channel-voltage serial short pulse digital signal transmitted through the optical fiber cable 400 is passed to the clock restorer 530 through the digital time delay 510 and the MUX 520.
- the clock restorer 530 includes a time delay unit 531 and a pulse generator 533, and the clock restored when the channel-voltage serial short pulse digital signal passes through the time delay unit 531 and the pulse generator 533.
- a channel-voltage serial digital signal 1230 is generated and sent to series-parallel converter 550.
- the counter 540 generates and sends an output active signal to the serial-to-parallel converter 550 that causes the serial-to-parallel converter 550 to convert the serial signal into a parallel signal.
- the 'serial signal' refers to the 'channel-voltage serial digital signal'
- the 'parallel signal' refers to the 'channel-voltage parallel digital signal'.
- the 24-bit counter 540 and 24-bit serial-to-parallel converter 550 may be used when a 24-bit channel-voltage serial short pulse digital signal is transmitted.
- the serial-to-parallel converter 550 generates a channel-voltage parallel digital signal in synchronization with the channel-voltage serial short pulse digital signal to the output active signal.
- Parallel-to-serial converter 560 converts the channel-voltage parallel digital signal into a channel-voltage serial digital signal.
- the clock signal required for the parallel-to-serial converter 560 and the output active signal for converting the parallel signal into the serial signal are commonly used in the channel-voltage receiving module 500 so that the modules are synchronized with each other.
- the serializer ballast may include a time delay unit 531, an AND gate unit 570, and a counter 540.
- the AND gate part 570 outputs a high signal.
- the first delay time in the digital time delay 510 passes the selected channel-voltage serial digital signal.
- the channel-voltage serial digital signal passing through the delay period enters the serial-to-parallel converter 550 and generates an output active signal having a different time from the beginning to convert the serial signal into a parallel signal.
- the output active signal of the serial-to-parallel converter 550 and the input active signal of the parallel-to-serial converter 560 do not have High at the same time and the AND gate portion 570 becomes Low, the output of the serial-to-parallel converter 550 is output.
- the parallel signal is stably converted into a serial signal.
- the channel-voltage serial digital signal passed with the first delay does not bring the AND gate portion 570 low, it counts at the counter 540 and passes with a second delay. Counting is performed until the AND gate portion 570 goes low, and a series conversion ballast can be configured with up to eight delay times.
- the time T s at which the parallel-to-serial converter 560 reads the parallel signal and converts it into a serial signal is determined or input by the clock time f ck-s and the parallel signal bits which are commonly supplied to the channel-voltage receiving modules 500. Determined by the activation signal.
- the channel-voltage receiving module 500 can be all contained in one CPLD (Complex Programmable Logic Device), thereby saving installation space and facilitating expansion.
- FIG. 7 is a diagram showing generation of a channel-voltage serial digital signal in a channel-voltage receiving module according to the present embodiment.
- the channel-voltage serial short pulse digital signal 1210 passes through the time delay unit 531 and the pulse generator 533, the restored clock signal 1220 is generated and then the channel-voltage serial digital signal is generated. 1230 is generated.
- the time delay unit 531 adjusts the delay time by connecting the logic gates in series, and the pulse generator 533 generates a pulse signal using a D-type flip / flop.
- the delay time T d of the time delay 531 is greater than the pulse duration T 0 .
- the delay time T d of the time delay 531 is less than the pulse duration 2T 0 .
- FIG. 8 is a diagram illustrating a channel-voltage receiving module and a shot serial-synchronized transfer module according to the present embodiment.
- the shot serial-to-sync transfer module 600 includes a series-parallel converter 610-1, a parallel-serial converter 620-1, a module selector 630, a clock generator / counter 640, and Serial-to-parallel converter 650.
- the serial-parallel converter 610-1 receives the channel-voltage serial digital signal from the channel-voltage receiving module and converts the channel-voltage parallel digital signal.
- the parallel-to-serial converter 620-1 receives the channel-voltage parallel digital signal, converts it into a channel-voltage serial digital signal, and sends it to the module selector 630.
- the module selector 630 is configured as a digital MUX, and the number of channels is determined according to the number of channel-voltage receiving modules.
- the module selector 630 is configured with 10 channels of MUX since the module is configured with 10 modules when receiving a voltage signal from 160 channels.
- the clock generator / counter 640 generates a MUX select signal and sends it to the module selector 630.
- Serial-to-parallel converter 650 generates a synchronized channel-voltage parallel digital signal.
- FIG. 9 illustrates a shot serial-sync transfer module, a DIO board, and a computer according to the present embodiment.
- the serial-parallel converter 650 converts the channel-voltage parallel digital signal.
- Clock generator 640-3 generates a clock signal and sends it to shot serial-sync transfer module 600.
- the two counters 640-1 and 640-2 generate selection signals required for the module selector 630.
- the clock signal is used as an active signal using the 24 counter 640-2, which is then used as a module selector 630 selection signal using the 4 bit counter 640-1. Is used.
- the clock signal and the counter signal are commonly supplied to the shot serial-sync transfer module 600 so that the signals are synchronized with each other.
- the module selector 630 time-passes the channel-voltage serial digital signal and passes one of the 16 identical channel-voltage serial digital signals output by each module to the module selector 630 to serial-to-parallel converter 650 Send to
- the shot serial-synchronized transfer module 600 except for the clock generator 640-3 may be placed in one CPLD to simplify the manufacture of the device.
- the channel-voltage parallel digital signal output from the shot serial-sync transfer module 600 is input to the computer through the DIO board.
- the shot serial-synchronization transfer module 600 reads only once and converts it into a parallel signal, and sequentially receives the channel-voltage serial digital signal of another module during the remaining 15 outputs. To convert. Since the time channel of each module is read and outputted, the time to read and convert 16 channel signals of one module or the time to read 256 channels of 16 modules is the same.
- FIG. 10 is a diagram illustrating time division of ten modules for synchronization in the shot serial-synchronized transfer module according to the present embodiment.
- each module's parallel-to-serial converter is continuous with the conversion time T con or the serial-to-parallel converter 650 of the first analog-to-digital converter 332 and the second analog-to-digital converter 333. Passes once in 16: 1 module selector 630 during time T p .
- the same parallel-to-serial converter 620 output may pass once or twice during T p when passing to the 10: 1 module selector 630.
- Some channels send twice the channel-voltage digital signal of the same channel, but they are taken as one when read by the application software from a computer.
- the DIO board mounted on the computer reads the channel-voltage parallel digital signal, which is the output of the shot serial-sync transfer module 600, into the parallel port at once, and the DIO with 24 digital input ports when the 24-bit channel-voltage digital signal is used. Receive the signal to the board.
- the channel-voltage digital signal sent to the computer is processed by extracting and storing the voltage value of each channel using the application software or by moving to the signal processing software.
- the present embodiment is an example in which the above-described modules are implemented as separate modules, but any one of the above-described modules may be implemented by being separated into several modules or integrated into one module.
- a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function.
- ASIC application specific integrated circuit
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Claims (17)
- 복수의 채널들을 가진 스퀴드(Superconducting quantum interference device: SQUID)센서에 연결되어,상기 복수의 채널들에서 출력되는 전압 신호를 입력받아 상기 전압 신호가 출력되는 채널에 대한 정보 및 상기 전압 신호에 대한 정보를 갖는 채널-전압 직렬 디지털 신호를 생성하는 디지털 변환부 및상기 디지털 변환부로부터 상기 채널-전압 직렬 디지털 신호를 전송하는 광섬유 케이블을 포함하는 다채널 스퀴드 신호의 데이터 획득 시스템.
- 제 1 항에 있어서,상기 스퀴드 센서 및 디지털 변환부는 전자파 또는 전자기파를 차단하는 차폐실(shield room) 내에 위치하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 1 항에 있어서,상기 디지털 변환부는상기 스퀴드 센서의 복수의 채널들로부터 출력되는 전압 신호를 증폭하고 선형화하는 FLL/HPF/AMP 회로 모듈 및상기 증폭하고 선형화된 전압 신호를 상기 채널-전압 직렬 디지털 신호로 변환하는 채널-전압 전송 모듈을 포함하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 3 항에 있어서,상기 FLL/HPF/AMP 회로 모듈은상기 스퀴드 센서의 복수의 채널들로부터 출력되는 전압 신호를 선형화하는 FLL 회로 모듈 및 상기 선형화된 전압 신호의 DC 오프셋(DC offset)을 제거하고 상기 전압 신호를 증폭하는 HPF/AMP 회로 모듈를 포함하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 1 항에 있어서,상기 채널-전압 직렬 디지털 신호를 시간 분할하여 순차적으로 채널-전압 병렬 디지털 신호로 변환하는 샷 직렬-동기화 이송 모듈를 더 포함하는 데이터 획득 시스템.
- 제 5 항에 있어서,상기 채널-전압 병렬 디지털 신호를 저장하거나 상기 채널-전압 병렬 디지털 신호로부터 상기 전압 신호가 출력되는 채널에 대한 정보 및 상기 전압 신호에 대한 정보를 생성하는 컴퓨터를 더 포함하는 데이터 획득 시스템.
- 복수의 채널들을 가진 스퀴드 센서에 연결되어,상기 복수의 채널들에서 출력되는 전압 신호로부터 상기 전압 신호가 출력되는 채널에 대한 정보 및 상기 전압 신호에 대한 정보를 갖는 채널-전압 직렬 디지털 신호를 생성하는 복수의 디지털 변환 모듈을 포함하는 디지털 변환부 및상기 디지털 변환부로부터 상기 채널-전압 직렬 디지털 신호를 전송하는 상기 디지털 변환 모듈의 수만큼의 광섬유 케이블을 포함하는 다채널 스퀴드 신호의 데이터 획득 시스템.
- 제 7 항에 있어서,상기 디지털 변환 모듈은상기 스퀴드 센서의 복수의 채널들로부터 출력되는 전압 신호를 증폭하고 선형화하는 FLL/HPF/AMP 회로 모듈 및상기 증폭하고 선형화된 전압 신호를 상기 채널-전압 직렬 디지털 신호로 변환하는 채널-전압 전송 모듈을 포함하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 8 항에 있어서,상기 FLL/HPF/AMP 회로 모듈은상기 스퀴드 센서의 복수의 채널들로부터 출력되는 전압 신호를 선형화하는 FLL 회로 모듈 및 상기 선형화된 전압 신호의 DC 오프셋(DC offset)을 제거하고 상기 전압 신호를 증폭하는 HPF/AMP 회로 모듈를 포함하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 8 항에 있어서,상기 채널-전압 전송 모듈은상기 스퀴드 센서의 복수의 채널들을 순차적으로 선택하여 선택된 전압 신호를 제1 아날로그-디지털 변환기 및 제2 아날로그-디지털 변환기에 번갈아 보내는 아날로그 스위치;상기 아날로그 스위치가 채널을 선택하게 하는 제1 병렬 디지털 신호를 생성하는 클럭생성기;상기 디지털 변환부에서 상기 디지털 변환 모듈을 분별하게 하는 제2 병렬 디지털 신호를 생성하는 모듈 분별기;상기 선택된 전압 신호를 직렬 디지털 신호로 변환하는 제1 아날로그-디지털 변환기;상기 제1 아날로그-디지털 변환기가 상기 선택된 전압 신호를 읽는 동안 직전에 선택된 채널로부터의 전압 신호를 직렬 디지털 신호로 변환하는 제2 아날로그-디지털 변환기; 및상기 제1 병렬 디지털 신호 및 상기 제2 병렬 디지털 신호를 직렬 신호로 변환하고 상기 변환된 직렬 신호에 상기 직렬 디지털 신호를 결합하여 상기 채널-전압 직렬 디지털 신호를 생성하는 병렬-직렬 변환기를 포함하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 7 항에 있어서,상기 채널-전압 직렬 디지털 신호를 시간 분할하여 순차적으로 채널-전압 병렬 디지털 신호로 변환하는 샷 직렬-동기화 이송 모듈를 더 포함하는 데이터 획득 시스템.
- 제 11 항에 있어서,상기 채널-전압 병렬 디지털 신호를 저장하거나 상기 채널-전압 병렬 디지털 신호로부터 상기 전압 신호가 출력되는 채널에 대한 정보 및 상기 전압 신호에 대한 정보를 생성하는 컴퓨터를 더 포함하는 데이터 획득 시스템.
- 전자파 또는 전자기파를 차단하는 차폐실 내에 위치하여 전압 신호가 출력되는 복수의 채널들을 가진 스퀴드 센서에 연결되어 상기 복수의 채널들에서 출력되는 전압 신호를 입력받아 상기 전압 신호가 출력되는 채널에 대한 정보 및 상기 전압 신호에 대한 정보를 갖는 채널-전압 직렬 디지털 신호를 생성하는 디지털 변환부 및상기 디지털 변환부로부터 상기 채널-전압 직렬 디지털 신호를 상기 차폐실 외부로 전송하는 광섬유 케이블을 포함하는 다채널 스퀴드 신호의 데이터 획득 시스템.
- 제 13 항에 있어서,상기 디지털 변환부는상기 스퀴드 센서의 복수의 채널들로부터 출력되는 전압 신호를 증폭하고 선형화하는 FLL/HPF/AMP 회로 모듈 및상기 증폭하고 선형화된 전압 신호를 상기 채널-전압 직렬 디지털 신호로 변환하는 채널-전압 전송 모듈을 포함하는 것을 특징으로 하는 데이터 획득 시스템.
- 제 13 항에 있어서,상기 채널-전압 직렬 디지털 신호를 시간 분할하여 순차적으로 채널-전압 병렬 디지털 신호로 변환하는 샷 직렬-동기화 이송 모듈를 더 포함하는 데이터 획득 시스템.
- 전자파 또는 전자기파를 차단하는 차폐실 내에서 복수의 채널들을 가진 스퀴드 센서로부터 출력되는 전압 신호로부터 상기 전압 신호가 출력되는 채널에 대한 정보 및 상기 전압 신호에 대한 정보를 갖는 채널-전압 직렬 디지털 신호를 생성하는 단계; 및상기 채널-전압 직렬 디지털 신호를 광섬유 케이블을 이용하여 상기 차폐실 외부로 전송하는 단계를 포함하는 것을 특징으로 하는 다채널 스퀴드 신호의 데이터 획득 방법.
- 제 16 항에 있어서,상기 광섬유 케이블을 이용하여 상기 차폐실 외부로 전송된 상기 채널-전압 직렬 디지털 신호를 시간 분할하여 순차적으로 병렬 디지털 신호로 변환하는 단계를 더 포함하는 것을 특징으로 하는 데이터 획득 방법.
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