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TranSpec-DSP Specifications
Dated April 2003, all information without guarantee, subject to changes:
- Mechanical Construction
- Standard 19'' chassis with 4 HU, EMI-protected, CE
certificate
- Dimensions: approx. 180 x 435 x 310 mm (H x W x D)
- Weight: approx. 10 kg
- Optical Components
- Spectrometer modules of Carl Zeiss Germany, adaptation for
standard FSMA fiber optics
- Holographic created concave diffraction grating
- Photodiode arrays with 256, 512 or 1024 pixel, no cooling
required
- Permanently adjusted modules, no mechanically moveable
parts, free of maintenance
- Module specific wavelength ranges: 200 - 1100 nm
- Module specific spectral resolution: 3 - 10 nm
- Module specific spectral pixel interval: approx. 0.8 - 3.3
nm
- Absolute wavelength accuracy: < 0.3 nm
- Temperature drift: typical < 0.005 nm / Kelvin
- Analog/Digital Electronics
- 1 MHz 16 bits AD-converter DATEL ADS 931 with sample &
hold
- Spurious-free dynamic range, no
missing codes at 16 bits
- Effectively useable conversion rate: 1 µs / pixel
- Integrated System Electronics
- 32 bits Texas Instruments Digital Signal Processor TMS320C44
with 60 MHz
- 2 Mbytes (optionally 8 Mbytes) SRAM for real-time spectra
recorder, 3600 spectra at 256 diodes
- 7-channel TTL trigger input and output, typical 1 µs
- TTL shutter control for DSL-1 deuterium and HSL-2 halogen
spectral lamp
- TTL bulb burn control for HSL-2 halogen spectral lamp
- Optionally 4-channel D/A-output, 14 bits at 60 kHz
- Link/RS-422 interface adapter board
and cable for the PC
- Spectra Scanning
- Shortest integration time: 0.4 ms at 256 pixel - 0.7 ms at
512 pixel - 1.2 ms at 1024 pixel
- Longest integration time: 5 seconds, selectable in steps
of 0.1 ms
- Absolute accuracy of the integration time: ± 1 µs max.
- Response time to interrupt the integration (TTL trigger):
< 1 ms, controlled by software
- Total system noise (standard deviation, dark current at 10
ms):
5 counts/without averaging, 1 count/25 measurements
- Real-date and -time stamping of every spectrum within a
resolution of 1 µs
Repetition rates, loss-free
while continuous scanning, including possible
dark current correction and/or averaging:
| PDA with 256 pixel: |
2,500 spectra /
second (corresponding to 0.4
ms integration time) |
| PDA with 512 pixel: |
1,428 spectra / second (corresponding to 0.7 ms
integration time) |
| PDA with 1024 pixel: |
833 spectra /
second (corresponding to 1.2
ms integration time) |
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