Photodiode

Photodiodes convert photons into electrical current and are used as power sources as well as photodetectors. Recall that the internal fields setup in the depletion region sweep holes toward the p-region and electrons toward the n-region. Photons above the energy gap absorbed in or near the depletion region produce the electron-hole pairs, which are swept [Pg.413]

Schematic showing the operation of a solid state laser. In the unbiased state (a) the Fermi level lies above the conduction band in the n-side and below the valence band on the p-side. (b) Biasing the junction lifts the filled states in the conduction band in the n-region above the above empty states below the valence band in the p-side, thus inverting the electron population. [Pg.414]

Figure Bl.19.23. Principle of simultaneous measurement of nomial and lateral (torsional) forces. The intensity difference of the upper and lower segments of the photodiode is proportional to the z-bending of the cantilever. The intensity difference between the right and left segments is proportional to the torsion, t, of the force sensor. (Taken from [110], figure 2.)...

The gates referred to above can be created in various ways. For example, suppose that the probe beam goes tlirough the sample, but only half of its physical width (in the sample) is crossed with the pump beam. Now, if we have two photodiodes, one can measure the intensify of the perturbed part of the probe beam, whilst the second measures the unperturbed part as a result of creating spatial gates, the two recorded output signals can be used to measure the... [Pg.3028]

A linear array of photodiodes providing the ability to detect simultaneously radiation at several wavelengths. [Pg.379]

Listed below is a two-part series on the application of photodiode arrays in UV/Vis spectroscopy. [Pg.458]

Spectroscopy Partl, AnaZ. Chem. 1985, 57, 1057A-1073A. Jones, D. G. Photodiode Array Detectors in UV-Vis... [Pg.458]

Remcho, V. T. McNair, H. M. Rasmussen, H. T. HPLC Method Development with the Photodiode Array Detector, /. Chem. Educ. 1992, 69, A117-A119. [Pg.613]

A mixture of methyl paraben, ethyl paraben, propyl paraben, diethyl phthalate, and butyl paraben is separated by HPLC. This experiment emphasizes the development of a mobile-phase composition capable of separating the mixture. A photodiode array detector demonstrates the coelution of the two compounds. [Pg.613]

Visible Tungsten filament xenon arc Glass Prism grating interferometer Photomultiplier photodiode photographic plate... [Pg.60]

Available halogen Avalanche photodiodes Avan Avatec... [Pg.80]

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