SED Response Verification

Principal: psmith
Deputy: nanyao
Data Monkey(s):
Priority: Desired
Downlink Priority: Normal
Analysis Time: 72 hours
Last Updated:

Objective

To verify if the response is tracked adequately with undispersed light as opposed to light that has traversed the SED-mode optical path.

Description

The response of the 70 µm array is measured by using the flat field stimulator and compared to the response measured using undispersed light from the flood stimulator. This will test if significant wavelength-dependent differences are seen. The test will consist of a number (10) of alternating flood stim and flat field stim flashes. Since CSMM position for the flat field stim allows undispersed sky background on to the array, the telescope should be pointed toward an area of sky with low background. The recommended target position for the telescope is the north CVZ dark field (RA=17h15m59.00s, DEC=+65d48m59.0s). The observation will start with a flood (undispersed) stim followed by a flat field (dispersed) stim. We should repeat these exposures 9 times and then finish the entire sequence with a flood stim. Depending on the brightness of the dispersed flat field stim, we may need several 3 or 10s DCEs to better the statistics.

Data Collected

A specialized IER that provides alternating flood and flat field stimulator exposures. The current IER has a 19 minute execution time.

Data Reformatting Requirements

Array Data Desired:

70 µm

Data Reformatting Option:

Special Instructions:

Task Dependencies

Calibration Dependencies

Output and Deliverable Products

Determination of whether the flood stimulator is adequate for tracking the response variations of the 70 µm array while in SED mode.

Data Analysis

The analysis for this task will involve tracking the pixel responsivity using the flood stimulator and the flat field stimulator. As usual, the flood stimulator will be used to correct the responsivity of the pixels for the flat field stimulator exposures. If there is no wavelength dependence in the responsivity of the array, the corrected flat field stimulator data will be constant with time and wavelength. The response of a pixel at the ``blue'' end of the array should be the same relative to the response of a pixel at the ``red'' end as observed for the relative response of the two pixels using the flood stimulator. In short, the flat field stims should be identical (to within the measurement uncertainty) to each other after the variations in the response are removed by the flood stim. Simple ratios of the various "response-corrected" flat field stims will be taken to search for deviations from unity.

Software Requirements

Actions Following Analysis

Failure Modes and Responses

Additional Notes