Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

Damen, M. C. J.

Bibliographic data

Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856343064

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Damen, M. C. J.

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 3 Spectral signatures of objects. Chairman: G. Guyot, Liaison: N. J. J. Bunnik

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: A preliminary assessment of an airborne thermal video frame scanning system for environmental engineering surveys. T. J. M. Kennie & C. D. Dale, G. C. Stove

Document type:: Multivolume work

Structure type:: Chapter

287 irs is inly two ement ems, such in a 1 array of the ' still i be !st at iys’ i.e. a the :he :tors Jhilst it :ually t to occur js enabling i currently 3l »ample. 1 Video actral ige jm) -5.6 -12 -13 -13 -13 -12 -12 -13 ference verel the AGA orne use. he most esolution re 8 to 14pm ng of 100 it refreshed uced by the isolution of es image moving fficulty of hieve this I the liquid lelled. >e gimbel lent HgCdTe image over i frame rate of 30Hz. Both AGA end Inframetrics have also developed dedicated image processing software for enhancing the imagery and extracting quantitative temperature data. The majority of high performance TVFS systems operating in the 8 to 13 pm band have been developed for avionic and military applications. Development of the current range of UK military imagers began in 1976 and at that time the decision was made to adopt a modular design philosophy. This is known as the Thermal Imaging Common Module (TICM) programme. The GEC V1010 TICM 11 is representative of this design. Instruments of this type can be mounted in either a fixed wing aircraft or a helicopter, in the latter case the scanner is mounted in a pod to allow a forward looking image to be obtained. The Rank Pull in Controls (RPC) SS600 thermal imager differs from the conventional TICM scanning design which uses a flapping mirror to scan the.field in elevation and a rotating polygon to provide the line scan. In contrast, the RPC design uses two coaxially mounted rotating polygons to form the two dimensional scan pattern. This unique design (Figure 1) is claimed to result in a lighter, more robust and more compact imager suitable for use where severe vibration may be experienced. DETECTOR 10Omm Figure 1. Rank Pullin Controls SS600-scanning system (Lettington, 1985) The Barr and Stroud IR18 is another TVFS system based on a modular design approach. A narrower scanner field of view is used compared with several other equivalent systems. In this case also a novel optical-mechanical scanning design is used which is discussed in the following section of the paper. 3.3 The Barr and Stroud IR18 Mk II Thermal Video Frame Scanner The scanner used in these tests was developed initially for military use, but it is now available for commercial remote sensing applications. Table 2 outlines some of the technical specifications of the sensor and Figure 2 illustrates the principle of operation of the scanner. To achieve a video compatible image, two main criteria have to be met: firstly, the resultant image must be rectilinear and, secondly, it should have a 625 line CCTV output (525 lines in the USA). In order to achieve this, banded scanning is carried out using a high speed rotor, turning at 39,000 rpm, to give Figure 2. Barr and Stroud IR18 Mk 11 thermal video frame scanner - principle of operation (Berry and Runciman, 1981) the line format, and a slower galvanometer driven rotor to achieve the frame transfer at 50Hz. Petrie (1983) has estimated, that the system has a data collection rate equivalent to 19 X 10^ pixels/second. The optics of the IR18 are used to collimate the incoming radiation and, by using afocal telescopes, enable a variety of magnification ratios to be used, so producing various object field of views (Table 3). Such an arrangement ensures that the incident radiation forms a bundle of parallel rays which can then be focussed onto the frame scanning rotor. A concave mirror then re-collimates the image onto the rotating hexagonal rotor and subsequently onto the detector. Table 3: Barr and Stroud IR18 - object field of view with various auxiliary telescopes Magnification Ratio Object Field of View (H° XV 0 ) 1 38.0 25.5 1.5 25.3 17.0 6 6.30 4.25 9 4.22 2.8 14 2.7 1.8 The detector used is an eight-element Mu Hard ’SPRITE’, although four elements are normally preselected for use. The scanning sequence is such that on each successive frame scan a different element (of the four active elements) scans the same part of the scene. A consequence of this is that if the imager output is integrated over a number of frames, detector non-uniformity errors can be eliminated. Complex microprocessor controlled circuitry controls the synchronisation of the rotor speeds and signal outputs and the transfer of the data onto video tape. A conventional U-Matic video tape recorder is used to store the imagery.

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