Monitoring system 監控系統
(updated: 03/16/2010)

Monitoring system of space plasma simulation chamber is designed to watch out these devices: 1 Pirani gauge meter, 1 ionization gauge meter, 3 power supplies for maintaining voltages of acceleration grids in plasma generation, 1 power supply for heating nickel belts in plasma generation, 1 controller for compound turbo molecular pump, a customized Langmuir probe, and a turning table.

  • A Pirani gauge meter: 6 analog-ins, ±10 V, 16-bit, 1 kHz.
  • An Ionization gauge meter: 2 analog-ins, ±10 V, 16-bit, 1 kHz; 20 digital IOs, SE/DI, ±5V, 1 MHz.
  • Thermal couples: 8 analog-ins, ±10 V, 16-bit, 1 kHz.
  • A plasma device: 4 analog-ins, ±300 V, 16-bit, 1 kHz. It can be replaced by a multi-functional meter and a multiplexer for high power.
  • A power supply for turbo molecular pump: (9+15) digital I/Os, SE/DI, ±5V, 1 MHz.
  • Additional two serial ports (9 pins) RS-232/RS422/RS485.
  • A turn table: one rotation axis.

Monitoring system of Space Plasma Simulation Chamber based on NI PXI
Manufacturer National Instruments Corp.
Chassis NI PXI-1042Q Quiet 8-Slot Chassis
Function Monitoring status and conditions of space plasma simulation chamber
Input voltage 100-240 VAC
Input frequency 50-60 Hz
Input current 8 A
Power supply 300 W
Operating temperature 0° to 40°C
Dimension 177 mm D x 271.3 mm W x 396.5 mm H
Weight 8.4 kg
Slot 1 NI PXI-PCIe8361, MXI-Express, 1 Port PCIe, 3 m Cable
Slot 2 NI PXI-6229, M Series DAQ (32 Analog Inputs, 48 Digital I/O, 4 Analog Outputs) with NI-DAQmx driver software
2 x SCC-68 I/O Connector with 4 SCC Module Slots
2 x SHC68-68-EPM Shielded Cable, 68-D-Type to 68 VHDCI Offset, 2 m
Slot 3 NI PXI-4071 7 1/2 Digit FlexDMM (1.8 MS/s Digitizer, 10nV-1000V, 1pA-3A, 2-yr cal)
Slot 4 NI PXI-2584 12-Channel 600V CAT II Multiplexer
Connector and Backshell for NI PXI-2584
Slot 5 PXI-8431/2, 2 Port, RS485/RS422 Serial Interface
2 x RS485 Null-Modem Cable, DB-9 Female to DB-9 Female, 2m
Slot 6 NI PXI-4110 Triple-Output Programmable DC Power Supply with APS-4100 Aux Power
or NI PXI-8430/2, 2 Port, RS232 Serial Interface
2 x RS232 Null-Modem Cable, DB-9 Female to DB-9 Female, 2m
Slot 7 NI PXI-GPIB NI-488.2 for Windows Vista/XP/2000
Type X2 double-shielded GPIB cable, 2 m
Slot 8 NI PXI-7344 4-Axis Mid-Range Stepper/Servo Motion Controller
1 x SHC68-C68-S Cable, 2 m
1 x NI UMI-7774 Connector Block

Functional generator

Signal generator
Manufacturer EZ Digital Co., Ltd.
Model FG-7002C
Function Providing voltage signal to Langmuir probe
Input voltage AC 103~126/206~252V, 50/60 Hz, 15W
Dimension 255 mm D x 255 mm W x 90 mm H
Weight 2 kg
Waveforms Sine, Square, Triangle, Ramp, Pulse, Sawtooth, TTL/CMOS leveled square, and DC
Frequency range 0.02 Hz to 2 MHz in 7 ranges (1, 10, 100, 1K, 10K, 100K, and 1M)
Output level 20 Vp-p in open circuit, 10 Vp-p into 50 load
Output impedance 50±5%
Attenuator 20dB fixed and continuously variable


Electronic recorder
Manufacturer Rikadenki Co., Ltd.
Model RW-21T
Function Measuring the voltage signal from Langmuir probe
Input voltage AC 100V, 50/60 Hz, 20VA
Dimension 453 mm D x 452 mm W x 78 mm H
Weight 8.7 kg
Voltage detection panel WV-2B
Unit 0.5 mV/cm to 2 V/cm

Ionization vacuum gauge

Ionization vacuum gauge meter
Manufacturer ULVAC, Inc.
Model GI-D7
Function Measuring chamber pressure under high vacuum state and protecting residual gas analyzer from damage
Pressure range 1.3x10-5 ~ 6.7x10-1 Pa for WI-T
1.3x10-6 ~ 1.0x10-2 Pa for WI-B
Measurement range 10-6 ~ 10-1 Pa
Measurement accuracy ±15%
Display Digital indication, 2 digit mantissa, 1 digit exponent
Communication RS-232C (9600/19200/38400 bps)
Set point (contact point capacity) 2 points (AC 100V/0.5A)
Recorder output Linear ouput from 0 to 10 VDC
Pseudo-logarithmic output from 0 to 10 VDC (1V linear signal in each digit)
Filament protection Off when 8.0x10-1 Pa for WI-T
Off when 2.0x10-1 Pa for WI-B
Input voltage AC 100±10V, 50/60Hz, single phase, 100 VA
Dimension 240 mm D x 350 mm W x 99 mm H
Weight 6 kg
Sensors WI-T or WI-B

Turn table

Turn table
Manufacturer ARK Advanced Technology Co., Inc.
Function Providing rotation motion to sensors in Space Plasma Simulation Chamber
Operating pressure Down to 10-6 Torr
Rotation angle -180° to 180°
Angle resolution 0.1°
Maximum rotation speed 4 rps
Payload weight 20 kg
Manual adjust sensor height ±15 mm
Material SUS304
In-vacuum stepping motor Oriental Motor

Optical spectral analyzer

Photonic multichannel analyzer
Manufacturer Hamamatsu Photonics K. K.
Model PMA-12
Part number C10027-01
Function Diagnosing plasma compositions and reactions inside the Space Plasma Simulation Chamber
Spectral range 200 - 950 nm
Resolution < 2 nm FWHM
Sensor type Cooled back-thinned CCD linear image sensor
Number of photosensitivedevice channel 1024 channels
Pixel size 24 μm x 2.928 mm
Device cooling temperature -15℃
Read-out noise (electrons) 16
Dark current (electrons/scan) 75 (-15℃; 20 ms)
AD resolution 16 bits
Spectrograph Czerny-Turner type
Spectrograph F number 4
Sampling rate Up to 50 complete spectra per second
Exposure time 19 ms to 64 s
Easy light input Optical fiber bundle
Fiber receiving area 1 mm in diameter
Fiber type Bundled fiber SUS tube 12 mm in diameter
Fiber length 1.5 m
External trigger input TTL level / high impedance
PMA software U6039-01
Dimension 383 mm D x 262 mm W x 99 mm H
Interface USB 2.0
Input voltage AC 100-240V, 50/60Hz, 70 VA