Cooled infrared filters and dichroics for the sea and land surface temperature radiometer

Hawkins, Gary; Sherwood, Richard; Djotni, Karim; Coppo, P.; Höhnemann, Holger; Belli, Fabio

doi:10.1364/ao.52.002125

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…To acquire the embedded thermo-optical data properties for thin film simulations, we characterized and correlated the thermal behavior from a historic repository [14][15][16] of PbTe/ZnSe narrow bandpass filters, manufactured over a course of two decades, and covering a wide range of wavelengths, bandwidths, and multilayer design types. These filters were manufactured by thermal evaporation using a modified Balzers BA510 deposition chamber.…”

Section: Experimental Data and Simulation Methodsmentioning

confidence: 99%

“…The selection of bandpass filters used in this study were deposited with substrate temperatures between 185-210 °C. Further deposition details are discussed in the papers where the filters were first published [14][15][16]. The filters were all newly characterized by extraction from high temperature FTIR spectral measurements across the range of 20-200 ºC, where the observed wavelength displacements were correlated with multilayer design properties in [5].…”

Section: Experimental Data and Simulation Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Determination of the embedded thermo-optical expansion coefficients of PbTe and ZnSe thin film infrared multilayers

Hawkins¹,

Stolberg-Rohr²

2015

Opt. Express

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This paper reports the first derived thermo-optical properties for vacuum deposited infrared thin films embedded in multilayers. These properties were extracted from the temperature-dependence of manufactured narrow bandpass filters across the 4-17 µm mid-infrared wavelength region. Using a repository of spaceflight multi-cavity bandpass filters, the thermo-optical expansion coefficients of PbTe and ZnSe were determined across an elevated temperature range 20-160 °C. Embedded ZnSe films showed thermo-optical properties similar to reported bulk values, whilst the embedded PbTe films of lower optical density, deviate from reference literature sources. Detailed knowledge of derived coefficients is essential to the multilayer design of temperature-invariant narrow bandpass filters for use in non-cooled infrared detection systems. We further present manufacture of the first reported temperature-invariant multi-cavity narrow bandpass filter utilizing PbS chalcogenide layer material.

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Section: Experimental Data and Simulation Methodsmentioning

confidence: 99%

Section: Experimental Data and Simulation Methodsmentioning

confidence: 99%

Determination of the embedded thermo-optical expansion coefficients of PbTe and ZnSe thin film infrared multilayers

Hawkins¹,

Stolberg-Rohr²

2015

Opt. Express

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“…Two blackbody sources, that are viewed by the scanners every 600 ms, provide continuous calibration of the infrared channels, and a diffuser based Visible Calibration system (VISCAL) for calibrating the solar reflectance bands. A more detailed description of the SLSTR design and the predicted performance is described in [7][8][9]. The SLSTR instruments developed for ESA-ESTEC by an industrial consortium led by Leonardo Company (Firenze, Italy) involving Jena Optronik (Jena, Germany) and RAL Space (Harwell Oxford, UK).…”

Section: Introductionmentioning

confidence: 99%

Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels

et al. 2020

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The first two models of the Sea and Land Surface Temperature Radiometers (SLSTR) for the European Copernicus Sentinel-3 missions were tested prior to launch at the Rutherford Appleton Laboratory space instrument calibration facility. The pre-launch tests provide an essential reference that ensures that the flight data of SLSTR are calibrated to the same standards needed for surface temperature measurements and to those used by shipborne radiometers for Fiducial Reference Measurement (FRM). The radiometric calibrations of the thermal infrared channels were validated against accurate and traceable reference BB sources under flight representative thermal vacuum environment. Measurements were performed in both earth views for source temperatures covering the main operating range, for different instrument configurations and for the full field-of-view of the instruments. The data were used to derive non-linearity curves to be used in the level-1 processing. All results showed that the measured brightness temperatures and radiometric noise agreed within the requirements for the mission. An inconsistency that particularly affected SLSTR-A was observed which has been attributed to an internal stray light error. A correction for the stray light has been proposed to reduce the error. The internal stray light error was reduced for SLSTR-B by replacing the coating on the main aperture stop. We present a description of the test methodology and the key results.

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“…This motivated this work to design and develop a rover with a radiation detector. smooth variable structure filter has also been extensively reviewed for its potential in nonlinear control and estimation in robotics [40,[43][44][45][46][47][48][49][50]. Additionally, the use of Kalman filter and its variants in robotic manipulators has shown promising results [51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69].…”

Section: Motivationmentioning

confidence: 99%

Applications of autonomous rover for radiometric surveillance

Faroukh

Al-Shabi

Khuwaileh

2023

Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV

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The concept of an autonomous rover system to perform maintenance, investigations, and data collection in remote or inaccessible locations has seen an increased demand recently. In this work, an autonomous rover is developed to detect radioactive contamination. The rover utilizes a gas tube radiation detector as an active sensing element and onboard modules to command and control the rover, such as a GNSS receiver, Autopilot controller, and a microcontroller as an onboard controller a communication module. The rover could be controlled by a human operator or autonomous control. In both cases, the operator would be far away from the scene. The rover has many potentially valuable applications, such as radiometric survey and mapping, locating survivors, or aiding in recovering victims after a CBRN disaster. This paper discusses the concept of operations and the design of the autonomous rover.

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Cooled infrared filters and dichroics for the sea and land surface temperature radiometer

Cited by 12 publications

References 13 publications

Determination of the embedded thermo-optical expansion coefficients of PbTe and ZnSe thin film infrared multilayers

Determination of the embedded thermo-optical expansion coefficients of PbTe and ZnSe thin film infrared multilayers

Sentinel-3A/B SLSTR Pre-Launch Calibration of the Thermal InfraRed Channels

Applications of autonomous rover for radiometric surveillance

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