A Vacuum Infrared Standard Radiation Thermometer at the PTB

Gutschwager, B.; Hollandt, J.; Jankowski, Tomasz; Gärtner, R.

doi:10.1007/s10765-007-0349-x

Cited by 17 publications

(16 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The radiation thermometer VIRST is described in detail in Gutschwager et al (2008Gutschwager et al ( , 2009. VIRST is a stand-alone transfer radiation thermometer which can be operated inside a vacuum chamber, attached to a vacuum chamber or, when equipped with an antireflection-coated zinc selenide window, in air.…”

Section: Setup and Calibration Proceduresmentioning

confidence: 99%

Radiometric calibration of the in-flight blackbody calibration system of the GLORIA interferometer

et al. 2014

Self Cite

View full text Add to dashboard Cite

Abstract. GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere) is an airborne, imaging, infrared Fourier transform spectrometer that applies the limbimaging technique to perform trace gas and temperature measurements in the Earth's atmosphere with three-dimensional resolution. To ensure the traceability of these measurements to the International Temperature Scale and thereby to an absolute radiance scale, GLORIA carries an on-board calibration system. Basically, it consists of two identical large-area and high-emissivity infrared radiators, which can be continuously and independently operated at two adjustable temperatures in a range from −50 • C to 0 • C during flight. Here we describe the radiometric and thermometric characterization and calibration of the in-flight calibration system at the Reduced Background Calibration Facility of the PhysikalischTechnische Bundesanstalt. This was performed with a standard uncertainty of less than 110 mK. Extensive investigations of the system concerning its absolute radiation temperature and spectral radiance, its temperature homogeneity and its short-and long-term stability are discussed. The traceability chain of these measurements is presented.

show abstract

Section: Setup and Calibration Proceduresmentioning

confidence: 99%

Radiometric calibration of the in-flight blackbody calibration system of the GLORIA interferometer

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…The radiance temperatures of the GBB optical surfaces were determined in the range from −50 to 0 • C with an uncertainty of less than 100 mK (two sigma). For the measurement of spectral radiance this comparison is performed via a Fourier Transform Spectrometer, for the radiance temperature via the broadband radiance thermometer VIRST (8 to 14 µm) as transfer instruments (Gutschwager et al, 2008). With a transfer radiation thermometer the radiance temperature of the reference cavity blackbody radiators of the RBCF is directly linked to the heat-pipe blackbodies of PTB (?…”

Section: Its-90 Traceabilitymentioning

confidence: 99%

The in-flight blackbody calibration system for the GLORIA interferometer on board an airborne research platform

et al. 2013

Self Cite

View full text Add to dashboard Cite

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is a prototype of an imaging Fourier Transform Spectrometer (FTS) for PRE-MIER, a former candidate mission for ESA's Earth Explorer 7. GLORIA is deployed on board various research aircraft such as the Russian M55 Geophysica or the German HALO. The instrument provides detailed infrared images of the Upper Troposphere/Lower Stratosphere (UTLS) region, which plays a crucial role in the climate system. GLORIA uses a two-dimensional detector array for infrared limb observations in emission and therefore needs large-area blackbody radiation sources (126 mm × 126 mm) for calibration.In order to meet the highly demanding uncertainty requirements for the scientific objectives of the GLORIA missions and due to the sophisticated tomographic evaluation scheme, the spatial distribution of the radiance temperature of the blackbody calibration sources has to be determined with an uncertainty of about 0.1 K. Since GLORIA is exposed to the hostile environment of the UTLS with mutable low temperature and pressure, an in-flight calibration system has to be carefully designed to cope with those adverse circumstances.The GLORIA in-flight calibration system consists of two identical weight-optimised high-precision blackbody radiation sources, which are independently stabilised at two different temperatures. The two point calibration is in the range of the observed atmospheric infrared radiance emissions with 10 K below and 30 K above ambient temperature, respectively. Thermo-Electric Coolers are used to control the temperature of the blackbody radiation sources offering the advantage of avoiding cryogens and mechanical coolers. The design and performance of the GLORIA in-flight calibration system is presented. The blackbody calibration sources have been comprehensively characterised for their spatially (full aperture) and spectrally (7 to 13 µm) resolved radiation properties in terms of radiance temperatures traceable to the International Temperature Scale (ITS-90) at the PhysikalischTechnische Bundesanstalt (PTB), the national metrology institute of Germany.

show abstract

“…비냉각방식은 주변의 온도변화가 자체복사의 변화를 만들기 때문에 광초 퍼를 사용하여 자체복사를 보상하기는 하나 100 mK 오차내 의 측정을 위해서는 계통오차의 보정이 필요하다 [2,3] . [4,5] . 수차에 의한 기여는 렌 즈의 최적 디자인으로 최소화 할 수 있으며, 산란광은 차광막 (baffle)을 사용하거나 2차 결상광학계로 줄일 수 있다.…”

Section: Figunclassified

“…물론 1 µm 이하의 파 장을 사용하는 고온복사온도계에서는 회절효과는 무시할 수 있으나 측정하는 표적의 온도가 낮을수록 사용하는 파장대역 이 길어짐에 따라 회절에 의한 SSE가 커진다. 그러므로 적외 선 복사온도계의 SSE는 반드시 보정해 주어야 하기 때문에 최근 복사온도 분야에서 SSE 관련 연구가 활발하다 [4][5][6][7][8][9][10][11][12] . [2] .…”

Section: Figunclassified

Size-of-source Effect and Self-radiation Effect of an Infrared Radiation Thermometer

Yoo¹,

Kim²,

Park³

et al. 2010

Korean Journal of Optics and Photonics

View full text Add to dashboard Cite

모든 복사온도계는 복사원 크기효과(Size-of-Source Effect, SSE)와 자기복사효과를 가지고 있다. 복사원의 직경에 따른 복사온 도계의 검출기 신호세기로 정의된 SSE의 주원인은 회절이기 때문에 파장에 크게 좌우된다. 본 논문에서는 중저온영역에서 복사 온도의 전달표준기로 많이 사용되고 있는 TRT2(Transfer Radiation Thermometer 2, HEITRONICS)의 SSE와 자기복사 특성을 측정하였다. 측정한 TRT2의 SSE 값을 사용하여 계산한 결과 흑체의 온도가 300℃ 일 때, 개구 직경이 60 mm인 흑체와 10 mm인 흑체의 복사온도 차이가 저온모드(8-14 µm) 에서 3.5℃, 중온모드(3.9 µm)에서 0.5℃인 것을 알 수 있었다. 또한, 복사온도계 몸체 온도가 2.6℃ 변화했을 때 자기복사효과 때문에 흑체의 복사온도는 110 mK 다르게 측정되었다. Size-of-source Effect and Self-radiation Effect of an Infrared Radiation ThermometerYong Shim Yoo † , Bong-Hwak Kim, Chul-Woung Park, and Seung-Nam Park All radiation thermometers have a size-of-source effect (SSE) and a self-radiation effect (SRE). The SSE,defined as dependence of the detector signal of a radiation thermometer on the diameter of a source, is critically dependent on the wavelength since diffraction is the main cause. In this paper, we have measured the SSE and the SRE of TRT2 (Transfer Radiation Thermometer 2, HEITRONICS) widely used as a transfer standard in low and middle temperature range. At 300℃, The radiation temperature difference between the 60 mm diameter blackbody and 10 mm diameter blackbody due to the SSE was estimated to be 3.5℃ in low temperature mode (8-14 µm) and 0.5℃ in middle temperature mode (3.9 µm). In addition, the measured radiation temperature difference of the blackbody due to the SRE was found to be 110 mK when the body temperature change of TRT2 was set at 2.6℃.

show abstract

A Vacuum Infrared Standard Radiation Thermometer at the PTB

Cited by 17 publications

References 3 publications

Radiometric calibration of the in-flight blackbody calibration system of the GLORIA interferometer

Radiometric calibration of the in-flight blackbody calibration system of the GLORIA interferometer

The in-flight blackbody calibration system for the GLORIA interferometer on board an airborne research platform

Size-of-source Effect and Self-radiation Effect of an Infrared Radiation Thermometer

Contact Info

Product

Resources

About