Engineering topics
Mouroulis, P.
Publications and source records attributed to Mouroulis, P..
The Portable Remote Imaging Spectrometer (PRISM) Coastal Ocean Sensor
No abstract available
In Situ Visible to Short Wavelength Imaging Spectroscopy with the Ultra Compact Imaging Spectrometer (UCIS): Case Studies from the Mars Exploration Rovers
In Situ imaging spectroscopy provides a way to address complex questions of geological evolution for both aqueous and igneous processes by mapping mineral composition at the spatial scale of rocks and outcrops. Examination of locations studied by the Mars Exploration Rovers Spirit and Opportunity can provide examples of the potential utility and define the needed measurement requirements. A compact instrument is needed to be able to adequately address these science questions from a rover platform. The Ultra Compact Imaging Spectrometer (UCIS) is an instrument designed to address the science need and implementation constraints.
Optical Design and Performance of the Ultra-Compact Imaging Spectrometer
We present the optical design and performance of the Ultra-Compact Imaging Spectrometer (UCIS) currently under development at Caltech's Jet Propulsion Laboratory. The new instrument demonstrates a low optical bench mass of less than 0.5 kg and compact size that enables Mars Rover or other in situ planetary applications. UCIS is a F/4, wide field (30deg) design, covering the spectral range 500-2600 nm and is enabled by a simple all aluminum two-mirror telescope and Offner spectrometer. We discuss here the optical design and alignment method that enables this compact and low mass imaging spectrometer and demonstrate successful spectrometer alignment with smile and keystone levels at 2-3% of a pixel width.
Progress in Implementation of the Portable Remote Imaging Spectrometer (PRISM) Coastal Ocean Sensor
No abstract available
Progress in implementation of the Portable Remote Imaging Spectrometer (PRISM) coastal ocean sensor.
PRISM is a pushbroom imaging spectrometer currently in its second year of development at the Jet Propulsion Laboratory, intended to address the needs of airborne coastal ocean science research. We give an overview of the instrument functionality and then describe progress in component and subsystem fabrication. In the second year, all critical components have been received and most have been integrated into their respective subsystems. The design of the vacuum enclosure has also been completed. We present results from the telescope and spectrometer sub-assemblies, the focal plane electronics, and the overall system assembly implementation.
Design of an Airborne Portable Remote Imaging Spectrometer (PRISM) for the Coastal Ocean
PRISM is a pushbroom imaging spectrometer currently under development at the Jet Propulsion Laboratory, intended to address the needs of airborne coastal ocean science research. We describe here the instrument design and the technologies that enable it to achieve its distinguishing characteristics. PRISM covers the 350-1050 nm range with a 3.1 nm sampling and a 33(deg) field of view. The design provides for high signal to noise ratio, high uniformity of response, and low polarization sensitivity. The complete instrument also incorporates two additional wavelength bands at 1240 and 1610 nm in a spot radiometer configuration to aid with atmospheric correction.
The Moon Mineralogy (M3) Imaging Spectrometer: Early Assessment of the Spectral, Radiometric, Spatial and Uniformity Properties
The Moon Mineralogy Mapper's (M3) is a high uniformity and high signal-to-noise ratio NASA imaging spectrometer that is a guest instrument on the Indian Chandrayaan-1 Mission to the Moon. The laboratory measured spectral, radiometric, spatial, and uniformity characteristics of the M3 instrument are given. The M3 imaging spectrometer takes advantage of a suite of critical enabling capabilities to achieve its measurement requirement with a mass of 8 kg, power usage of 15 W, and volume of 25X18X12 cm. The M3 detector and spectrometer are cooled by a multi-stage passive cooler. This paper presents early M3 performance assessment results.
Optical design for high-fidelity imaging spectrometry
In this talk, the techniques for achieving high response uniformity from a pushbroom imaging spectrometer are discussed, and spectrometer system examples are given that maximize SNR and uniformity.
Optical design of a reflectance/raman confocal microspectrometer
A miniaturized instrument for systematic planetary mineralogy is presented, and the optical design of the component parts is discussed. The instrument combines the following capabilities: wide field color imaging, confocal imaging at two different resolution/range levels, reflectance spectroscopy in the 400-2500 nm region with a resolution of 10 nm, and Raman spectroscopy over 4000 cm^-1with an average resolution of 3.3 cm^-1. The instrument can also serve as an expandable platform for adding fluorescence spectroscopy, or for examining samples from a distance of several meters while using the same spectrometer.
Beyond spot diagrams: end-user oriented optical design
In this talk, two examples are given of the process of translating user requirements into optimization and assessment tools. In the first place, recent work on the effects of aberrations on the perceived image quality of visual instruments is reviewed. The second example concerns the extraction of accurate spectroscopic information from pushbroom imaging spectrometers.
Beyond spot diagrams: end-user oriented optical design
In this talk, two examples are given of the process of translating user requirements into optimization and assessment tools. In the first place, recent work on the effects of aberrations on the perceived image quality of visual instruments is reviewed. The second example concerns the extraction of accurate spectroscopic information from pushbroom imaging spectrometers.
Design, tolerancing and alignment of pushbroom imaging spectrometers for high response uniformity
We present a design and tolerancing approach that permits the achievement of a high degree of spatial and spectral uniformity of response from a pushbroom imaging spectrometer. Such uniformity of response is crucial for the extraction of accurate spectroscopic information from remotely sensed data. The spectrometer system example comprises two independent spectrometer modules covering the 400-2500 nm range, seperated through a dichroic mirror.
Current status of spaceborne imaging spectrometer design to match AVIRIS performance
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Design, tolerancing and alignment of pushbroom imaging spectrometers for high response uniformity
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The Cloudsat Profiling A-Band Spectrometer/Imager, PABSI
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The Cloudsat Profiling 02 A-Band Spectrometer/Imager (PABSI)
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The CloudSat Profiling 02 A-Band Spectrometer Imager (PABSI)
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