Airborne Measurements of the Thermal Radiation from the Wake of the USS IREX

reportActive / Technical Report | Accesssion Number: AD1214982 | Open PDF

Abstract:

The airborne equipment developed for measuring the thermal radiation from submarine wakes was designed to be flown at an altitude of 2000 feet at speeds of 30 to 60 knots. Operating with a noise input equivalent to 1.2 x 10(exp -7) watts cm-2 steradian-1, it is capable of measuring easily the difference in radiation between a wake and surrounding water when the temperature difference is only + or - 0.005 deg C. With the equipment installed in the M-2 airship, thermal radiation from submarine. wakes originating at depths down to 150 feet was measured at night at ranges up to 12,000 yards astern. For the first time, optical noise from the surface of the sea was observed with this type of equipment. Miles of sea were found to have optical noise levels equal to or less than that of the equipment, indicating that the signal-to-noise ratio can be increased still further.

Author(s):
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC
Funding Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC, WASHINGTON, DC
Document Type:
Technical Report/Interim Report
Publication Date:
1951 Feb 16
Pagination:
43

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release.
Copyright: Not Copyrighted

RECORD

Collection: TRECMS
Subject Terms
Descriptor(s):
power amplifiers, temperature gradients, detection, thermal radiation, amplifiers, electron tubes, frequency, military research, new jersey, radiation, right angles, construction, frequency response, periscopes, deep water, detectors, magnetic fields
Subject Categories:
Physics
Communities of Interest:
Descriptor(s):
temperature gradients, detection, thermal radiation, amplifiers, military research, radiation, right angles, new jersey, periscopes, deep water, detectors, fungi, measurement, sea surface temperature, submarine periscopes, sunlight, surface temperature
Creation Date:
2023 Nov 17
Update Date:
2023 Nov 20