Ocean Optics NIR - Manual (Page 27)

Appendix B
Specifications
How the Spectrometer Works
Light passes through the NIR Spectrometer through a fixed optical path. The optical bench of the NIR
Spectrometer has no moving parts that can wear or break; all the components are fixed in place at the time
of manufacture.
The following table describes each component in the NIR Spectrometer. Items marked with an asterisk
(*) can be user-specified (consult an Applications Scientist for more information):
NIR Spectrometer Component Table
Name Description
SMA Connector Light from a fiber enters the optical bench through the SMA connector.
Slit*
Light passes through the installed slit, which acts as the entrance aperture.
Entrance slits are rectangular apertures, with the width determining the amount of
light entering the optical bench. A slit is permanent and can only be changed by an
Ocean Optics technician.
You can also use the NIR Spectrometer without a slit installed. In this case, the
diameter of the fiber connected to the NIR Spectrometer determines the size of the
entrance aperture.
Installed Filter*
Light passes through a filter installed in the SMA connector. Both bandpass and
longpass filters are available to restrict radiation to certain wavelength regions.
Filters are permanently installed in the bulkhead of the SMA connector.
Collimating Mirror
Light coming in from the entrance aperture reflects from this mirror, as a collimated
beam, toward the grating.
Grating*
Light is diffracted by the fixed grating and directed to the focusing mirror. Instead of
the grating rotating (as it does in scanning monochromators and other instruments),
the grating in the NIR Spectrometer is fixed in place at the time of manufacture.
Focusing Mirror
Diffracted light hits this second mirror, which reflects and focuses the light on the
detector array.
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