Dr. William H. Morrow Profile

Dr. William H. Morrow

President at Resonance Ltd

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Publications (3)

SPIE Journal Paper | 31 May 2019

Calibration lamp design, characterization, and implementation for the Michelson Interferometer for Global High-Resolution Thermospheric Imaging instrument on the Ionospheric Connection satellite

Kenneth Marr, William Morrow, Charles Brown, Christoph Englert, John Harlander, Angel Cerrato, Kelvin Lamport, Stewart Harris

OE, Vol. 58, Issue 05, 054104, (May 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.5.054104

KEYWORDS: Lamps, Calibration, Sensors, Neon, Krypton, Satellites, Optical fibers, Satellite imaging, Michelson interferometers, Electronics

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Proceedings Article | 29 September 1995 Paper

MicroMAPS: a low-cost orbital remote sensor for the detection of CO and N2O

William Morrow

Proceedings Volume 2553, (1995) https://doi.org/10.1117/12.221387

KEYWORDS: Sensors, Carbon monoxide, Signal processing, Remote sensing, Atmospheric sensing, Signal detection, NOx, Satellites, Infrared detectors, Absorption

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MicroMAPS is a gas filter correlation radiometer capable of detecting trace atmospheric gases by remotely sensing their infrared absorption characteristics. While the method can be used to detect a number of trace species (including CH₄, SO₂, and NO₂), the current version of MicroMAPS detects CO and N₂O from a nadir viewing orbital platform. To do this, the instrument is equipped with CO and N₂O gas cells and configured to observe the earth's IR radiance in a band centered at 4.67 microns. It has been demonstrated that the synchronous detection of alternatively chopped signals through CO, vacuum and N₂O view cells can produce a quantitative measure CO in three tropospheric layers. The simplicity of the method affords a low cost technique for generating global maps of this important atmospheric species when viewing from space. MicroMAPS uses the sam method of detection of trace CO as an older instrument called MAPS. MAPS (the measurement of air pollution from satellites) has heritage from shuttle missions in 1982, 1984, and 1994 (STS-2, STS-41G, and STS68). There are two fundamental differences between MicroMAPS and MAPS. To give the correlation signal related to the CO column density in the atmosphere, MicroMAPS employs a rotating gas cell chopper and a single IR detector. MAPS employs fixed gas cells with more than one detector. MicroMAPS replaces the complex amplifier and synchronous detector analog signal processing system of MAPS with a microprocessor based signal processor. The effect of these two changes reduces the weight from 100 lbs plus (MAPS) to approximately 14 lbs (MicroMAPS) as well as reducing the cost of MicroMAPS by about the same proportion as its mass. On June 8, 1994 CTA Incorporated of Rockport, Maryland was awarded a NASA contract to build the Clark spacecraft as part of the small satellite technology initiative program. In March 1995 Resonance Ltd. received a contract to build a spacequalified MicroMAPS remote sensor for this small satellite.

Proceedings Article | 1 November 1993 Paper

Ultraviolet and VUV sources for in-flight calibration of space experiments

Molly Morrow, William Morrow, Lawrence Majorana

Proceedings Volume 1945, (1993) https://doi.org/10.1117/12.158793

KEYWORDS: Calibration, Vacuum ultraviolet, Ultraviolet radiation, Xenon, Lamps, Imaging systems, Satellites, Aerospace engineering, Sensors, Physics

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