Introduction Avalanche photodiode detectors (APD) have and will continue to be used in many diverse applications such as laser range finders, data communications or photon correlation studies. This paper discusses APD structures, critical performance parameter and excess noise factor. For low-light detection in the 200to 1150-nm range, the designer has three basic detector choices the silicon P...

CdZnTe has previously been shown to operate as an electro-optic radiation detector by utilizing the Pockels effect to measure steady-state nuclear reactor power levels. In the present work, the detector response to reactor power excursion experiments was investigated. Peak power levels during an excursion were predicted to be between 965 MW and 1009 MW using the Fuchs–Nordheim and Fuchs– Hansen...

We have developed an integrated hydrogenated amorphous silicon (a-Si:H) fluorescence detector for microfluidic genetic analysis. It consists of a half-ball lens, a ZnS/YF3 multilayer optical interference filter with a pinhole, and an annular a-Si:H PIN photodiode allowing the laser excitation to pass up through the central aperture in the photodiode and the filter. Microfluidic separations of m...

The detection of an optical signal using a photonic mixer device (PMD) as an alternative to the PIN photodiode for a high-speed infrared link is discussed. The PMD, at its linear range, is characterized as a correlator detector. The functionality of this PMD for a better Signal-to-Noise Ratio is described. With an improved mixing efficiency and photosensitive area, the PMD will replace the use ...

Two large-area, low noise, high speed fluorescence detectors have been built. One detector consists of a photodiode with an area of 28 mm x 28 mm and a low noise transimpedance amplifier. This detector has a input light-equivalent spectral noise density of less than 3 pW/ √ Hz, can recover from a large scattered light pulse within 10 μs, and has a bandwidth of at least 900 kHz. The second detec...

For underground particle physics experiments, noble gas radon from U-chain decay series could be a source of serious background events. We have developed a high sensitivity detector for radon using electrostatic collection and PIN photodiode. Recently, we have developed a new type of radon detector. We report basic performance of the new 80L radon detector.