Time Resolved Absolute Intensity Measurements of the 5106 Angstrom Copper Atomic Spectral Line in the AFFDL Rent Facility.
Interim technical rept. Dec 72-Feb 73,
AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO
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Spectral line intensity time histories of the copper spectral line at lambda 5106A were made while viewing from the side the gas cap region of blunt models under test in a Mach 1.8 contoured nozzle. These tests were performed in the Air Force Flight Dynamics Laboratory Re-Entry Nose Tip RENT Facility using arc heater stagnation pressures of 50, 75, 100 and 125 atmospheres, an arc heater current of 2600 amps, and a 0.9 in. 2.3 cm throat diameter1.1 in. 2.8 cm exit diameter contoured nozzle. Similar measurements were also made at a wavelength corresponding to a nearby continuum region lambda 5131A. In addition to the above measurements viewing across the gas cap, measurements were made with the field of view terminating on the hot model nose tips. Both short bursts 0.5 ms of high frequency response data approx. 500 KHz and continuous, moderate frequency response data 10 KHz were taken. Based on the above measurements, the response time and dynamic range required to follow the copper line intensity fluctuations in the model gas cap region have been determined. From the absolute intensity of the 5106A copper line, effects of self-absorption on a line intensity ratio temperature measurement are discussed.
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