XVIIIth Congress: XVIIIth Congress

kraus, karl; waldhäusl, peter

Bibliographic data

Multivolume work

Persistent identifier:: 1667435949

Title:: XVIIIth Congress

Sub title:: Vienna, Austria 1996

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667435949

Language:: English

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1667437070

Title:: XVIIIth Congress

Scope:: 230 Seiten

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667437070

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(31,B1)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist anhand des Copyrightjahrs ermittelt.

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

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: EXPERIMENTAL MULTI-WAVELENGTH IMAGING PYROMETER FOR REMOTE SENSING OF TEMPERATURE PROFILES ON SURFACES WITH UNKNOWN EMISSIVITY Michael B. Kaplinsky, Jun Li, Nathaniel J. McCaffrey, Edwin S. H. Hou and Walter F. Kosonocky

Document type:: Multivolume work

Structure type:: Chapter

EXPERIMENTAL MULTI-WAVELENGTH IMAGING PYROMETER FOR REMOTE SENSING OF TEMPERATURE PROFILES ON SURFACES WITH UNKNOWN EMISSIVITY Michael B. Kaplinsky, Jun Li, Nathaniel J. McCaffrey, Edwin S. H. Hou and Walter F. Kosonocky Electronic Imaging Center New Jersey Institute of Technology, Newark, New Jersey 07102-1982, USA KEY WORDS: Radiometric Temperature Measurement, Multispectral Radiometry, Infrared Sensor ABSTRACT Experimental Multi-wavelength Imaging Pyrometer (M-WIP) is presented for remote sensing of temperature profiles of targets with unknown spectrally varying emissivity. A software package was developed for calibration and real-time M-WIP measurements. An experimental 7-filter line-sensing M-WIP system was implemented with a 320x122-element PtSi IR-CCD imager and an assembly of narrow-band striped IR filters in the spectral range from 1797nm through 4512nm. The M-WIP system was calibrated against a commercial blackbody source over temperature range from 450?C to 950°C. The signal processing included background subtraction, compensation for variation of dark current with detected signal and correction for non-linearities of IR imager response. Initial M-WIP measurements demonstrated real- time temperature resolution AT of +1°C for blackbody target over temperature range from 600°C to 900°C. Temperature resolution of +4°C was demonstrated for the blackbody source viewed through the double polished silicon wafer with unknown spectral transmissivity in the temperature range from 500°C to 950°C. INTRODUCTION In order to obtain high accuracy of M-WIP temperature measurements it is essential to compensate The Don-contact radiometric temperature for the inherent non-linearities of the IR imager response. measurements are based on the detection and analysis d The signal conditioning presented in this paper includes thermal e viotien emite by gn e ect dre Er compensation for the loss of sensor responsivity with à ihe blackbody radi 7 à is defined id T accumulated signal level (saturation), background Ot the blac Qdy, Iadiator, vic 15 GeHned as an ide subtraction, and correction for the accumulated dark surface that emits more thermal radiation than any other current charge surface at the same temperature. The emission of real ; objects can be described by the surface emissivity, &, which is defined as the ratio of radiation emitted by the real surface to that emitted by the blackbody at the same temperature. This paper also presents the least-squares based algorithm for calibration of M-WIP system against reference blackbody source. This calibration utilizes wide range of blackbody temperatures and yields effective ; 3 spectral and transmission characteristics of the svstem. In general, in order to infer the temperature of the P S target from the measurement of emitted radiation, the value of the surface emissivity, e, should be known. Therefore, in the situations where the emissivity of te —. MULTI-WAVELENGTH IMAGING PYROMETER target is changing rapidly, or the conditions of the process preclude the independent measurements of target In its most general form, the least-squares emissivity, the conventional radiometric methods will minimization problem of M-WIP can be expressed as: not yield the true temperature. 2 : N ~ This paper presents the progress in the development min X A S;-S (TE À; | >. >. SA) (1) of a multi-wavelength imaging pyrometer (M-WIP) for TE i=l|0 remote sensing of temperature profiles of hot surfaces with unknown wavelength-dependent emissivity. For remote where: temperature sensing by M-WIP, the spectral radiance of : the target is measured at several distinct wavelengths by Si — detected signal at A; (electrons / pixel), an IR-CCD camera with an assembly of 7 narrow-band S(T,£,A) — theoretical signal at A (electrons / pixel), filters positioned in front of its FPA. Based on these T — unknown temperature of the target (K), measurements the temperature and model parameters of €=€(A) — emissivity model, the target emissivity are determined simultaneously from a a e ; 6 the least-squares fit of the theoretical model of IR camera Sos AS; = JSi Ims signal noises electronypixel) output signal to the experimental data [1-4, 11]. i 78 International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996 It calls 1 differe values values U signal refere where RA) | T) is effecti 1(À),t integr based on the deterr emiss comp accure On th will accur: of fre Analy of vai spectr polyn where mode E of th Trans apply indicz appro the e» with ¢ image

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