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ScanSpec

ScanSpec images
, Technical details

ScanSpec

What is ScanSpec?

ScanSpec is a high-performance imaging spectrometer developed at the Swedish Defense Research Agency (FOI) in Sweden. It is based on a non-imaging FTIR spectrometer from ABB-Bomem (www.bomem.com). The ABB-Bomem spectrometer (MR254) is fast and is equipped with a narrow-angle telescope. This makes it possible to acquire a spectral image by scanning a mirror in front of the telescope while the spectrometer is recording spectra.

This figure shows the very first measurement with ScanSpec in 1998.
(It's a Volvo 440.)

ScanSpec was built in 1998 and has been significantly improved since then. It has been used by FOI to analyze signatures from vehicles and backgrounds.

The Design of ScanSpec

In 1998 the IR department at FOI decided to build an imaging spectrometer based on a non-imaging spectrometer. Frans Lundberg (currently at Linova) was responsible for the project under the supervision of Claes Nelsson and Pär Nilsson at FOI.

The spectrometer from ABB-Bomem is a fast FTIR spectrometer. It is equipped with two IR detectors and a black-body source, all cooled with liquid nitrogen. The detectors are of InSb and MCT type to cover a large wavelength region. The spectral resolution is adjustable between 1 cm-1 and 128 cm-1. The MR254 is capable of collecting from 10 spectra/s at 1 cm-1 to over 100 spectra/s at 128 cm-1. A narrow-angle telescope with a circular field of view of 0.20 degrees is connected to the spectrometer.


A figure of ScanSpec generated from a CAD model.

The figure above depicts the main parts of the ScanSpec system. To the left you can see the spectrometer from ABB-Bomem with the large telescope looking at the ScanSpec mirror to the right in the figure. The main parts of the support construction consists of the aluminum U-beams. The mirror-turning system that is used to rotate the mirror consists of two rotary tables with control electronics from Newport Corporation. The mirror is an aluminum coated IR mirror.

The software in the ScanSpec system is responsible to collect the parameters for an acquisition, to execute the measurement, to do some signal processing and to present the result for the user. Almost all the software is written in the Matlab programming language, but some code is C/C++.

How ScanSpec was designed is described in depth in the report "The design of ScanSpec - a scanning FTIR spectrometer" (see below) by Frans Lundberg. Images of ScanSpec is available from the link below.

ScanSpec images

Technical details

See separate html-page!

More information

If you would like more information on ScanSpec contact Frans Lundberg (frans@linova.com) for a free documentation CD. Among other documents the CD contains PDF-files of the reports listed below. If you are interested in how ScanSpec has been used by FOI contact the following persons at FOI.

Claes Nelsson, clanel@foi.se. Pär Nilsson, pernil@foi.se.
FOI, Department of IR systems, Phone: +46 13 378000.

These are the two most important publications on ScanSpec.

  1. Frans Lundberg, The design of ScanSpec - a scanning imaging FTIR spectrometer , FOI-report number: FOA-R--99-01041-615--SE, 64 p, February 1999. Also published by the University of Umeå, Sweden.
  2. Claes Nelsson, Frans Lundberg, Pär Nilsson, Mattias Berglund, ScanSpec: an imaging FTIR spectrometer , Targets and backgrounds VI: characterization, visualization, and the detection process. Proceedings of SPIE, pp. 324-336 Vol. 4029. Orlando, FL, April 24-26, 2000. Also published by FOI.