Accession Number:

AD0257743

Title:

THE STUDY OF ELECTROMAGNETIC TECHNIQUES FOR SPACE NAVIGATION

Descriptive Note:

Corporate Author:

FRANKLIN INST PHILADELPHIA PA LABS FOR RESEARCH AND DEVELOPMENT

Personal Author(s):

Report Date:

1961-05-15

Pagination or Media Count:

1.0

Abstract:

Equipment for the initial phases of the template spectroscopy work has been completely assembled and is being refined. A number of templates have been made using both the suns spectrum and an iron arc source. Best results to-date have been obtained by matching the iron arc template against the iron lines in the suns spectrum. Very good discrimination was obtained at the match point with a dc detection system, but changes in light level were a problem. The addition of a wobbulator to impart vibrating motion to the slit of the spectrograph now permits the use of ac detection. Results with the latter system have been very encouraging. A detection sensitivity of 10-15 msec has been achieved initially. For the optical heterodyning phase, the radiometer has been placed in operation and checked out satisfactorily. Mounts and motor drives for the optical components have been completed and a lamp holder cavity for the Hg source has been designed. Development of the TWT mixer has been delayed pending an investigation of the use of a cw laser as local oscillator. Analysis shows that the use of a laser would considerably ease the broad band requirement and made possible the use of standard photomultipliers in the mixing stage. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE