MOSCOW BAUMANN STATE TECHNICAL UNIVERSITY
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AIM OF THE WORK

EQUIPMENT

   Spectrometer

   Optical behch design

   CCD-detector

   Microprocessor board

   Optical resolution

   Stray Light and Second Order Effects

   Fibre optic cable

   Light passing through fibre

   Fibre design

   Optical fibre types

   Collimating lens

   Objects of research

   AVALight lamp

   Halogen and deuterium lamps

SPECTROMETER CONTROL PARAMETERS

   Integration time

   Average

   Saturation detection levels

   Smoothing

   Correct for dynamic dark

EXPERIMENT

   Experiment scheme

   Àcquaintance with control interfaces

   Order of carrying out the work

   Stage 1

   Stage 2

   Stage 3

   Practical part
 
Microprocessor board
The AS161 is a modularly designed electronics board with a 16-bit microprocessor, 2 channel 14-bit AD converter and USB/RS232-interface. The AS-161 electronics board is a part of the AvaSpec spectrometers and can control 2 Avabench spectrometer channels.


Sony CCD detectors (ILX511, ILX554B) are connected to the electronics board interface connectors.

The board is equipped with an additional sub D15 digital IO connector with 14 programmable I/O ports (2 Dl, 12 DO). One digital out port is reserved for controlling the flash rate of an external Xenon strobe (single or multiple flashes per scan), one digital out port can be used to control external TTL-shutter devices, for the AS-161-FT-ILX one digital output is reserved for external control for flashing a laser source in LIBS applications. One digital in is reserved for external hardware trigger.

The on-board firmware controls the simultaneous data-sampling of the 2 channels, the sampled data is processed through a F(irst) l(n) F(irst) O(ut) interface with possibility of speeding up data transmission time by data reduction, defining a start and stop pixel per channel. The gain and offset parameters can be adapted per channel as well. The Firmware controls the USB and/or RS-232 interface.

Technical Data

Microprocessor Infineon, C161RI, 16 bit, 24 MHz
Memory 128 K EEPROM, 128K RAM, 8 bit
A/D converter 14 bit, 2 channels
Integration time 2ms - 60 seconds
Sony ILX511/554 2048 pixels 2 MHz, 14-31 msec /scan (10-2048 pixels) for 1 channel
Hamamatsu 8378-256Q, 200kHz, 7-9 msec /scan for 1 channel
TAOS 1301, 2MHz, 6-7 ms / scan for 1 channel
USB interface Version 1.1,12 Mbit
RS-232 interface Baud rate 115200 bps, DB-9 female connector
Power supply 12 VDC, reverse polarity protection, 160 mA (+ 20 mA per detector)
Temperature range 0 - 55 °C
Dimensions, weight 162.5x100 mm, 97 gr.