1. Data acquisition and data processing software for magnetic measurements for NICA magnets
Alexander Bychkov
LHEP, JINR
2017

2. Contents Main Measurement Program
Filtering and smoothing system based on wavelets and splines

3. Measurement test bench
Computer Rack Cabinet
Controlled Power Supply

4. Main Measurement Program

5. System Characteristics
Automated system (minimal operator actions)
Cold and warm measurements
24-bit ADC/DAC
samples/s per channel
Saving data - RAW
Sensor positioning <1⋅10-4
220 steps/rot

6. Signal form and Data acquisition
NI DAQmx chassis
base signal
Synchronized DACs
data
Synchronized ADCs
execution
Main Measurement Program
LabView
triggering
triggering

7. Sensor position management
Main Measurement Program
LabView
LAN
Real-Time controller
EtherCat
Servo drive
Sensor
position

8. Functions of Main Measurement Program
base signal
Synchronized DACs
NI DAQmx chassis
data
Synchronized ADCs
base signal
execution
triggering
Current supply
triggering
data
Main Measurement Program
LabView
current impulse
COM
GPIB
Sensor coils switch
Magnet coils switch
LAN
Real-Time controller
data
GPIB
Current Supply controller
Sensor
EtherCat
position
Servo drive
Superconducting Magnet

9. Measurement data collection
Measurement Data flow
Data storage
Temporal files
Preprocessing data
Filtering Smoothing
Integration
Measurement data collection
Processing data
Results

10. Wavelet peak detection
Preprocessing data
Complex noise
Minimal noise
Wavelet filtering
Wavelet peak detection
Spline smoothing
Integration
Integration

11. RAW data
I(t)

12. Power spectrum

13. Wavelet filtration
I(t)

14. Peak detection (wavelet)

15. Spline smoothing

16. Comparison: RAW and filtered data (1)

17. Comparison: RAW and filtered data (2)
Average error ~10-6
Worst situation error ~10-3

18. Thank you!