SYNCHRONIZED HIGH-SPEED SCANNING SPECTROMETERS.

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1967

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Ohio State University

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Rapid scanning spectrometers have been designed and built which can be synchronized with single-event, pulsed sources for which repetitive scanning may not be possible, e.g. for shock tube experiments with short test times. The scanning is achieved by rotating a small aluminum mirror placed before the exit slit of an Ebert type spectrometer. The mirror is spun by a pulsed magnetic field and can be brought up to maximum rotational velocity with a minimum delay of $15 \mu$sec. Spectrometers utilizing this principle have been built to operate in the infrared $(2-6 \mu)$, near IR $(0.6-1.1 \mu)$, and uv-visible $(0.3-1.2 \mu)$ spectral regions. With the IR spectrometer, a scanning speed of $0.02 \mu/\mu$sec is obtained with a spectral resolution of $0.07 \mu$. This instrument uses an indium antimonide photoconductive detector to monitor the radiation. The near IR spectrometer has a scanning speed of $22 {\AA}/\mu$sec and a spectral resolution of about $10{\AA}$. A cooled, red-sensitive photomultiplier is used to detect the radiation. Both of these instruments employ an auxiliary optical system to record the position of the rotating mirror while it scans. This feature permits a wavelength calibration signal to be obtained during every scan. The design and construction of these spectrometers is described, and their use to obtain data on atomic line, molecular band, and continuum radiation from shock heated gases is illustrated.

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This work was supported by Advanced Research Projects Agency monitored by the Army Missile Command. United States Army, Contract No. DA-01-021-AMC-12005(Z) (Part of Project DEFENDER).
Author Institution: Avco Everett Research Laboratory

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