Wavelength filters

From combinations of these three basic structures, nearly all more complicated structures of higher functionality can be built, e.g. sensors (of course), gratings, wavelength filters, modulators, amplifiers etc. Several of these sensing structures will be shown in section 4. 

Fig. 6. The Sofica LS photometer 1 - Hg Pump cooled by high pressure water, 2 - total reflection prism, 3 - achromatic condensing lens, 4 - wavelength filters, 5 - glass diffuser,...

Wavelength filters to isolate emission photons from excitation photons... 

Detection UV detector with 436 nm wavelength filter Sensitivity 0.05 aufs (absorbance units full scale)... 

Fig. 11. Linear correlation between activation energy and pre-exponential factor for different wavelengths (filters UG and BG) and intensities (metal gauze sieves S) of the CO oxidation on ZnO...

Fig. 18.1. Series 4 concerns the ground and metastable populations of ions in a plasma and their preparation and calculation for dynamical plasma models. It operates with GCR recombination and ionization coefficients, associated power loss coefficients and metastable fractions. The scope of series 4 is quite large extending into short wavelength filters modifying observed radiative power, astrophysical contribution function generation and parametrization of ionization and recombination...

Interference filters are used in photometers and spectrometers as fixed wavelength or tunable wavelength filters. An interference filter, equivalent to a Fabry-Perot etalon. 

Two types of photometers are used in HPLC— the fixed-wavelength filter photometer and the variable-wavelength spectrophotometer. These use a low-pressure mercury arc lamp as a light source, a transmission or interference filter to isolate a narrow band of wavelengths of light with which to excite the sample, and a photodiode to detect the light transmitted through the sample. 

Grating-grating fluorometers are convenient for method development, because they permit selection of any excitation or emission wavelength. Filter-filter instruments, on the other hand, are simpler, easier in use, less expensive, more sensitive, and better suited for transferring an HPLC method between laboratories. 

Molecular Devices VMax Kinetic Microplate Reader equipped with 405- and 490-nm wavelength filters. 

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