The Art of Radiometry

the generation, propagation, detection and measurement of optical radiation"

I am current preparing a new book for use in my undergraduate and graduate classes in radiometry and detectors at the University of Arizona's Optical Sciences Center. It is also intended to be a comprehensive reference for scientists, engineers and technicians. The table of contents is shown below. Comments from future readers are hereby solicited.

0. Preface

1. Introduction to radiometry
a. Electromagnetic radiation, optical radiation and light
b. History of radiometry
c. General radiometric configuration
d. Applications of radiometry
e. References

2. Propagation of optical radiation
a. Area, solid angles
b. Throughput
c. Radiance
d. Other radiometric quantities (energy, power, intensity, etc., Photons)
e. Maxims  of radiometry (inverse square law, cos^n)
f. The equation of radiative transfer (differential and integral)
g. Configuration factors
h. What's important?
i. Radiometry of optical instruments  Spectral quantities

3. Radiometric properties of materials
a. Intro and terminology
b. Transmission
c. Reflection
d. Absorption
e. Relationship between A, R & T
f.  Specular directional characteristics
g. Diffuse directional characteristics
h. Spectral characteristics

4. Generation of optical radiation
a. Blackbody radiation paragraph about effects of index of refraction
b. Absorption, reflection and transmission
c. Kirchhoffs law and emittance
d. Radiation from metals, dielectrics and gasses
e. A radiometrists gallery of sources
f. Artificial thermal sources
g. Natural sources, active and passive
h. Luminescent sources
i. Atmospheric transmission and emission
j. Practical source considerations and safety
k. Power supply considerations for light sources

5. Optical radiation detectors
a. Introduction to detectors
1. Basic detector mechanisms, terminology, SNR, figures of merit
2. Noise (origins, noise calculations, noise in detectors)
b. Thermal detectors
1. Thermoresistive (bolometric)
2. Thermoelectric (thermocouples, thermopiles)
3. Pyroelectric (voltage & current modes, poling, microphonics)
c. Photon detectors
1. Photoemissive (photocathodes, electron multipliers)
2. Photoconductive (intrinsic & extrinsic)
3. Photovoltaic (p/n, n/p, pin, avalanche, integrating mode)
d. Array detectors
1. Radiometric properties of the eye (human & other)
2. Photographic film (B&W, color)
3. Image converters and intensifiers (electron optics)
4. Image tubes (orthicon, vidicon)
5. Solid-state imaging devices (linear, 2-D arrays, CCD, CID)
e. Summary
1. How well can we do? (Derive BLIP D*, NEP=hB/=h/)
2. Comparative summary, charts, selection criteria

6. Radiometric Instruments
a. Radiometer optics
b. Spectral instruments
c. Components (filters, diffusers, lenses, mirrors, polarizers, attenuators, fibers, beamsplitters, etc.)
d. Detector considerations
e. Electronics and signal processing (filtering, LIA, gated (boxcar) amp, photon counting, signal averaging, heterodyne detection per Yariv,correlated double sampling, etc.)
f. Array radiometry, video
g. Systems integration and interfaces
1. Optical (baffles, diffuse vs specular black, traps)
2. Mechanical
3. Thermal (cooling, cold stops & filters)
4. Electrical (rooom temp & cold preamps)

7. Radiometric Measurements
a. Errors in measurements
b. Effects of noise in measurements
c. Measurement equation, range equations
d. Characterizing radiometers and detectors (, noise, D*, spectral response, FOV, linerarity, stray lite, frequency response, polarization)
e. Normalization (bandwidth, FOV, photometric, other responses)
f. Basic radiation measurements (small & extended sources)
g. Spectroradiometry
h. Measurement of optical properties of materials, laser calorimetry
i. Photometry
j. Color, appearance
k. Temperature measurements, correlated color temperature
l. Laser radiometry (power, energy, beam characteristics, calorimetry)
m. Measurement of display characteristics
n. Fiber optics measurements
o. Solar, atmospheric and environmental radiometry
p. Radiometry in astronomy
q. Special problems (coherence, polarization, atmospheric effects, etc.)
r. Radiometric data acquisition, processing, storage, display and presentation
s. The radiometric measurement check list

8. Radiometric Calibration
a. Calibration philosophy
b. Calibration requirements, traceability
c. Calibration configurations
d. Standard sources (blackbody radiation simulators, lamps)
e. Standard detectors (including laser power & energy)
f. Wavelength standards
g. Materials properties standards
h. Laboratory practice

9. References, Bibliography

APPENDICES
The SI system
Physical constants
Radiometric and photometric conversions (current ANSI, old (H,W,N), alternate (sterance)
Solid angle conversions
Internet and other resources
Selected vendors

 

CONTENTS OF ACCOMPANING DISKETTE

1. Introduction to radiometry (SUN)

2. Propagation of optical radiation
several configuration factors
Foote's law including cos4

4. Generation of optical radiation
blackbody, .EXE and spreadsheet, watts & photons
tungsten emissivity, along with other materials
directional emittance from specular surfaces
fluorescent lamp spectra
reflectances, artificial & natural
sunlight, AM0,1,2,3,5
LOWTRAN curves (2 meter lab, 1 km, several condx horiz, vertical
phosphors
globar, xenon & mercury arcs
curve fitting for tungsten lamps

5. Detection of optical radiation
photopic and scotopic curves
spectral response of film
spectral response & D* of detectors
absorption coeff of Si

6. Radiometric Instruments
mirror reflectances
select filter transmissions, absorption & interference, vs angle
transmission & reflection diffusers, spectral & angular, whites, blacks
op-amp characteristics
noise bandwidth
Chopping factors
cold stop improvement
snr vs low-pass
sig avg demo
fov vs. Focus plots

7. Radiometric Measurements
normalization, bw & fov
photometry
colorimetry, tristimulus curves
action spectra UVA, UVB, UVC, PhAR, etc.
Correlated color temp
Diffraction calculation
Range equations

8. Radiometric Calibration
standard calibration wavelengths
representative FEL curve
transmittance & didymium transmission curves
Halon & BaSO4 reflectance, Au and Al reflectance
Kodak gray card

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