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Posted on: 07/12/2015
This is the first of several blog entries discussing experiments on one of our HES range of the spectrometers. The plan is to provide our customers and supporters an insight into how our innovations are developed at ISI. To show some of the frustrations as well as the achievements when as you develop new products.
The HES range of systems use a static Fourier transform spectrometer at their core. This allows them to achieve a much greater etendue (a.k.a throughput) than a traditional spectrometer. Our standard system is compatible with a 1 mm optical fibre input with a 0.22 NA and does not require a slit (therefore collecting light) to obtain the desired resolution.
In order to increase the amount of light the spectrometer can capture further, we have developed a design a system based on our standard HES range that is compatible with a 3mm diameter fibre.
The plan is to construct a benchtop prototype system to investigate a number of investigate unknowns and determine whether issues exist in making spectral measurement on this scale. A series of experiments will be conducted to prove the performance of the instrument.
The plan of the experimental campaign is to investigate the following:
There are a number of risks/ Issues that we expect during the programme of work they include:
The spectrometer specifications are given in Table 1
|Grating Lines||60 g/mm||Reflective gratings|
|Spot||30 mm||3600 Resolving power|
|Resolution per pixel||3.6 cm-1|
|Spectral range||150 -2900 cm-1|
|Detector||1650 × 200 cooled CCD||
16 µm pitchDark noise < 0.004 e/s/pix
|Instrument FOV||23 mrad|
|Fibre input||Compatible with fibres up to 3.1 mm in diameter||NA= 0.22|
We chose to conduct the experiment with a transmission Raman setup. This ensured the target emission has a larger etendue than can be accepted by spectrometer fiber, ensuring the fibre is filled. Once this was set up, the fibre connecting the Raman rig to the spectrometer could be swapped and the corresponding performance of the instrument measured. An illustration of the rig is given in Fig 1
Fig 1 Illustration of Transmission Raman collection assembly