OBJECTIVE LENSES FOR HSI CAMERAS
CLYDEHSI LENSES
The objective lens used in front of the imaging spectrograph is a crucial component in the system design and operation. Firstly, it must provide a high quality image, and secondly, it must also transmit light across the full spectral range of the spectrograph or hyperspectral camera being used.
Each ClydeHSI lens can be locked in position to ensure focus is maintained even in harsh environments. Mechanical stability is guaranteed for the best stability in optical imaging and spectroscopy measurements.
Furthermore, every ClydeHSI lens is optimized for its spectral range and is fully multi-layer anti-reflection coated for the best transmission quality across the spectral range with minimum stray light and flare.
LENSES FOR
VNIR-S &
VNIR-HR CAMERAS
(400-1000 nm)
ClydeHSI supplies 4 lenses compatible with our hyperspectral cameras viewing the 400-1000 nm spectral range, each with a different focal length and subsequent field of view.
The tables below show an overview of the technical performance of each of the lenses when fitted to any of our hyperspectral cameras viewing the 400-1000 nm spectral range.
Note: the table on the left shows the lens performance with a 30 μm spectograph slit, whilst the table on the right shows performance with a 15 μm spectograph slit:
| Focal Length (mm) | FOV (deg) | IFOV (mrad) |
|---|---|---|
| 17 | 38.9 | 1.76 |
| 23 | 29.2 | 1.30 |
| 35 | 19.5 | 0.86 |
| 50 | 13.7 | 0.60 |
| Focal Length (mm) | FOV (deg) | IFOV (mrad) |
|---|---|---|
| 17 | 38.9 | 0.88 |
| 23 | 29.2 | 0.65 |
| 35 | 19.5 | 0.43 |
| 50 | 13.7 | 0.3 |
LENSES FOR
NIR-HR,
NIR-HR+ &
SWIR-384 CAMERAS
(1000-2500 nm)
ClydeHSI supplies 3 lenses compatible with our hyperspectral cameras viewing the 1000-2500 nm spectral range, each with a different focal length and subsequent field of view.
The tables below show an overview of the technical performance of each of the lenses when fitted to any of our hyperspectral cameras viewing the 1000-2500 nm spectral range.
Note: the table on the left shows the lens performance with a 30 μm spectograph slit, whilst the table on the right shows performance with a 15 μm spectograph slit:
| Focal Length (mm) | FOV (deg) | IFOV (mrad) |
|---|---|---|
| 22 | 24.6 | 1.4 |
| 30 | 18.2 | 1 |
| 56 | 9.8 | 0.5 |
| Focal Length (mm) | FOV (deg) | IFOV (mrad) |
|---|---|---|
| 22 | 24.6 | 0.7 |
| 30 | 18.2 | 0.5 |
| 56 | 9.8 | 0.3 |
A NOTE ON FIELD OF VIEW AND
INSTANTANEOUS FIELD OF VIEW
The Field of View (FOV) and the Instantaneous Field of View (IFOV) are characteristics of an imaging system that define the angular acceptance of the sensor to incoming light.
They are therefore dependent upon the sensor and pixel sizes as well as the focal length of the objective lens being used.
The angular FOV and IFOV are commonly expressed in degrees, while the linear field of view is a ration of lengths. FOV can be measured horizontally, vertically, or even diagonally.
FIELD OF VIEW (FOV)
Focal length of the objective lens, f
Spectograph slit length, Ls
Spectograph slit width, Ws
INSTANTANEOUS FIELD OF VIEW (IFOV)
Spectograph slit width, Ws
Focal length of the objective lens, f
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