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Development of improved lithium tantalate pyroelectric detectorsA program was undertaken to increase the detectivity of LiTaO3 pyroelectric detectors to meet a performance requirement of D star (500 K, 15 Hz)=4x10 to the 9th power cm Hz1/2W-1. Emphasis was placed on reduction of the thermal conductance of the detector element to its surroundings, thinning the detector wafer to a thickness less than 3 micrometers, and increasing the absorptivity of the standard metallic film coatings. During the program, thermal conductance was reduced 41 percent through the use of reticulated (slotted) structures. Self-supported detector wafers less than 2 micrometers thick were fabricated. Multiple layer coatings, including an AR coating, with 16 percent more absorptance, were designed and fabricated. Later refinements in the multilayer design program have absorptivities of 75-80 percent, but detectors with these coatings had to be more than 2 micrometers thick because of a mismatch in the thermal expansion coefficients with LiTaO3.
Document ID
19790006180
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Byer, N. E. (Martin Marietta Corp. Baltimore, MD, United States)
Vanderjagt, A. (Martin Marietta Corp. Baltimore, MD, United States)
Holton, W. (Martin Marietta Corp. Baltimore, MD, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1978
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-CR-158982
TR-78-49
Accession Number
79N14351
Funding Number(s)
CONTRACT_GRANT: NAS1-15106
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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