Optical Design Fundamentals for Infrared Systems, Second by Max J. Riedl

By Max J. Riedl

During this moment variation, writer Max Riedl has accelerated and up to date the knowledge present in his well known 1995 instructional to mirror adjustments in know-how and purposes that experience happened some time past decade. Achromats are lined in additional aspect and the dialogue of beam expanders has been up to date. Ball lens, gradient optics, and 3 reflect configurations were extra to the bankruptcy on designated Optical Surfaces and parts. a brand new part discusses wave aberrations, with a comparability of the round aberration to the Seidel coefficient. a brand new bankruptcy on thermal results examines the layout of athermats--lenses that make amends for undesired effects brought on by temperature tours. a brand new bankruptcy covers diamond turning, that's in particular compatible for generating aspheres and diffractive infrared elements.

Contents

- Preface
- historical Remarks
- Radiometric Considerations
- uncomplicated Optics
- fundamental Aberrations
- Wave Aberrations
- targeted Optical Surfaces and Components
- layout Examples
- Thermal Effects
- Optical Coatings
- photograph Evaluation
- Diamond Turning
- Appendix
- Index

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Extra resources for Optical Design Fundamentals for Infrared Systems, Second Edition (SPIE Tutorial Texts in Optical Engineering Vol. TT48)

Example text

The denominator of the bracket being discussed here refers the electrical bandwidth of the system's amplifier used for the noise measurement. The most common definition of this bandwidth is the frequency interval within which the power gain exceeds one-half of its maximum value. It is also often called the 3-dB bandwidth. 10 shows the specific detectivity as a function of wavelength for some of the most commonly used IR photoconductive detectors. 2 Thermistor Bolometer 10 8 295 2 4 6 8 10 20 40 FIG.

To refer to a temperature change of 1 K, we simply subtract the integrated Planck functions for two temperatures, 1 0 apart. Mathematically stated, SW f SW^(T} dT ^^W,,(T+1)Ak-^W,(T}0X . 7x105Wcm2K' Of course, as the temperature of the target changes, so does the ratio of the differential changes in the two spectral windows. 7) (UW/VT) 3-5µ It can be clearly seen that there is a crossover point where the sensitivity becomes higher in the shorter wavelength region. That crossover occurs at 470 K, or about 387°F.

This changing of the lens shape is called lens bending. It is a powerful basic tool in lens design, because the shape of the lens affects spherical aberration and coma but not its focal length. The dependence of spherical aberration on the shape for a germanium lens (N = 4) is illustrated in Fig. 10, where spherical aberration is plotted with respect to the ratio of the first surface curvature and the net curvature, c 1 /c. This ratio is called the shape factor K. FIG. 10 Change of spherical aberration with change of lens shape (lens bending) for a germanium lens with index N = 4.

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