Optical Spectroscopy with dispersive Spectrometers
Basics - Building Blocks - Systems - Applications

This page summarizes chapter 5 of the book
"Applications of Dispersive Optical Spectrometer Systems",
ISBN 9781628413724, SPIE monographs, Bellingham, WA, USA

Applications – R1
Spectroscopic Radiometry

This page presents the directory, the signs and symbols, conversions, and equations of the book, while the details are an exclusive part of  the book.

Radiometry, in optical spectroscopy, has two meanings:

A - the qualitatively and the quantitatively calibrated analysis of
     radiation from a source
B - the illumiantion of a known area by light from a qualitatively and
     quantitatively calibrated light source

Both functions are closely linked to light sources.

Here follows the book´s directory of topics, including the page numbers:

5 Radiometry 131

5.0 Introduction 131

5.1 Radiometric Parameters 132

5.1.1 Definition and measurement of the spectral radiant power 133 The sphere 134 Spectrometer 135 Detectors 136 Coupling 136 Data collection, interpretation, and processing, exemplary for a radiant flux measurement 139 System limits 140

5.1.2 Measurement of the spectral irradiance E and the radiance L 142 Fixed mounting of a sphere and spectrometer 143 Definition of a sphere to work with a pre-defined steradian 144 Interpretation 145 Acquisition of radiation from pulsed sources 145

5.1.3 Radiometry with parallel-detecting spectrographs 146

5.2 Radiometric Sample Illumination 146

5.2.1 General requirements, independent from the application 146 Bandwidth: the spectral bandwidth 146 Bandwidth: the uniformity of the wavelength over the slitwidth 147 Wavelength (wavenumber, photon energy, frequency): accuracy of the wavelength 147 Wavelength range: the useful range 148 Illuminated area: size and shape 148 Irradiance E at the illuminated surface 148 Uniformity of irradiance E over the illuminated area 149 Stray light/false light, tolerated by the experiment 149 Polarization 150 Spectral illumination with a reference channel for calibrated flux of radiation 151

5.3 Analysis of Spectral and Power Spatial Distribution Provided by the System 153

5.3.1 Reference analysis by a single point detector 153

5.3.2 Analysis of spectral and power distribution over the illuminated field 153

5.4 Calibration of Radiometric Spectral Data 154

5.4.1 Description of a realized system and its calibration with a certified source, enabling calibrated source analysis 154 Experimental considerations 155 Experimental operations 155

5.4.2 Calibration facilities 158

References 158