Figure 1: The front side of the calibration setup. The entire setup is covered in black felt to cut down on stray light. The calibration lamp is placed about 1 meter from the black felt at the very front of the setup (nearest end in this picture). A laser diode is used for positioning the lamp, pinhole, and detector on axis.

Figure 2: A closeup of the calibration lamp. A filter wheel has been designed for our narrow band filters by Chuck Bower. A exchangable pinhole is placed behind the filter wheel as the entrance aperature to the back side of the setup.

Figure 3: The back side of the calibration setup. The pinhole light travels through a rudementary baffle and shines on the detector at left. The back side of this setup is light tight (i.e. the detector has no measureable signal above the bias voltage when the pinhole is covered).

Figure 4: The detectors. The out-of-focus detector on the left is a Hamamatsu S1337-33BR Silicon photodetector that has a Hamamatsu-calibrated spectral response accurate to 5%. The detector on the right is a Hamamatsu G5125-10 InGaAs photodetector that is also being calibrated by Hamamatsu.

Figure 5: Calibration setup using an integrating sphere. The filter wheel has been moved to the other side of the divider.