With a stable emission spectrum, the ratio of filter-in-the-beam to no-filter spectrum is the filter throughput. Ideally we'd have the ability to move the filter in x and y in the beam, and have it tilted at the angle of the filters in the Aux Tel beam. A Thor labs temperature-balancing filter will flatten the overall response function.
#ZEMAX FILE FOR SPECTROGRAPH PLUS#
The ocean optics halogen source at might be a good light source- TTL shutter control plus ability to insert a balancing filter. Edmund optics makes a 50 mm f/2 lens that works across 400 to 1000 nm. The emitter can be placed essentially at the focus of the re-imager lens. That means a single 1 inch lens is adequate, with the collector placed 30 cm away and the filter half-way in between. We want an f/18 beam that has a diameter of 12mm on the filter surface, with a central obscuration that mimics the actual beam. We need enough spectral resolution to sample modulations in the transmission function, and part per thousand precision. The beam footprint should replicate the 12mm diameter beam on the filter. We should construct the ability to measure and monitor relative filter transmission functions in a beam that replicates the Aux Tel f/18 obstructed beam. The unvignetted field size is 45-12=33mm on a side. For a telecentric beam, the filter adapter has an open side length of 45mm. In the f/18 beam, the direct imaging spot size on the filter is therefore 222/18=12mm in diameter. So filter-to-detector distance is 222 mm. the CCD is 260mm (not a precise number) from Nasmyth flange. How large is beam spot at filter location?įilters are 38mm from Nasymth rotator flange, and are tilted at 5.7 degrees. As shown below, the spots we have are going to be much much larger than this. How much does that change beam size? Taking an f/18 beam out of focus by 1mm makes a circle that is 1/18 mm = 50 microns in diameter. The filters in question are 3-4mm thick so we expect of order 1mm of focal shift. How much does the position of the focused beam shift when filter is inserted and removed?ĭz=(thickness)*(1-1/n) where n is index of refraction of filter. Allegedly works with Avantes (what Patrick bought for LSST), Hamamatsu, and Ocean Optics. : Linux kernel for accessing USB spectrographs. SILVER-Nova Super Range TE Cooled SpectrometersĪbout 6000 $ with a 5% educational discount for spectrometers and parts Note we should get centroids of spectral lines to FWHM/SNR so much better than 0.1 nm.
#ZEMAX FILE FOR SPECTROGRAPH SOFTWARE#
This is on the list of devices for which software is alleged to work Python open source library for ocean optics spectrograph Need narrow-slit version to get the resolution we need. Not sure software library works with this one Python open source library for ocean optics spectrographs