A New Method to Establish a Scale for Laser Pulse Energies

Möstl, K.; Brandt, Friedhelm

doi:10.1088/0026-1394/28/3/003

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…The German national standards for detector calibrations at wavelengths λ > 200 nm are realized at the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, as part of a complete system of primary standards and transfer facilities, all operated at room temperature [1,2], covering the different fields of radiometric and photometric measurements [3].…”

Section: Introductionmentioning

confidence: 99%

PTB primary standard for optical radiant power: transfer-optimized facility in the clean-room centre

Stock¹,

Hofer²

1995

Metrologia

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The new clean-room centre of the Physikalisch-Technische Bundesanstalt (PTB) provides the best environment for measurements of the highest accuracy. One part is specifically designed for radiometric measurements. It contains the PTB primary standard facility for radiant power. This facility is developed at the PTB by optimizing the combination of various components, one of which is a side-viewing small-sized cryogenic radiometer. The handy size and the movable stage of this radiometer allow the transfer of the scale from the primary standard to secondary standards with minimal errors. A combination of a He-Ne laser, an Ar+ laser and a Ti:sapphire laser covers the spectral range 360 nm to 1090 nm. The new facility is described and a new method of transmittance measurement of the Brewster-angle window without disassembly of the window is presented.

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Section: Introductionmentioning

confidence: 99%

PTB primary standard for optical radiant power: transfer-optimized facility in the clean-room centre

Stock¹,

Hofer²

1995

Metrologia

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“…An alternative approach using the flash method has been used for the measurement of the specific heat, which relies on relative measurements using a sample with a known specific heat and emissivity as a reference and is, therefore, not an absolute method [17]. At the Physikalisch-Technische Bundesanstalt (PTB), the national metrology institute of Germany, the measurement of laser energy and absolute temperature can be performed with state-of-the-art uncertainties [18][19][20]. This expertise takes advantage of a commercial laser-flash apparatus for in situ measurements of the laser energy incident to the sample and the resulting temperature rise.…”

Section: Dynamic Emissivity Measurement Using the Laser-flash Techniquementioning

confidence: 99%

A Study on the Feasibility of Measuring the Emissivity with the Laser-Flash Method

et al. 2010

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The laser-flash method is a fast, widely used and well established technique to measure the thermal diffusivity. Since its introduction in the 1960s, it was proposed to expand this technique to the measurement of heat capacity and emissivity. Currently, the measurement of spectral emissivity at high temperatures is connected with relatively large uncertainties, although the spectral emissivity is an essential parameter for applications, e.g., in the lamp industry and fusion research. In this work, a theoretical study is presented on the possibility of emissivity measurements using the laser-flash method. Two mathematical approaches are discussed which solve the problem, that a measured temperature rise-necessary to calculate the emissivity-itself depends on the emissivity. It is shown that both methods have a negligible arithmetic error, making them applicable to be used in future work.

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“…As a standard for the measurement of laser energy, a compensated core calorimeter ( f 0,3 YO) is currently used. In addition to this, a method of generating laser pulses of well-defined energy from cw lasers was developed to such a high standard that glass disc calorimeters can be calibrated with a scale uncertainty of only 0,15 YO [7].…”

Section: Detector-based Radiometrymentioning

confidence: 99%

Network and Traceability of the Radiometric and Photometric Standards at the PTB

Metzdorf

1993

Metrologia

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The system of radiometric and photometric standards at the PTB is presented, emphasizing traceability, cross-linking, and future developments. Traceability from the national standards to the respective reference standards of calibration laboratories of the German Calibration Service (DKD) is also included. The future realization of the detector-based spectral irradiance scale resulting in a reduced uncertainty is described.

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A New Method to Establish a Scale for Laser Pulse Energies

Cited by 9 publications

References 1 publication

PTB primary standard for optical radiant power: transfer-optimized facility in the clean-room centre

PTB primary standard for optical radiant power: transfer-optimized facility in the clean-room centre

A Study on the Feasibility of Measuring the Emissivity with the Laser-Flash Method

Network and Traceability of the Radiometric and Photometric Standards at the PTB

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