Photodiode Arrays for Spectrochemical Measurements

Due to the development of semiconductor detectors with high spatial resolution -- e.g. charge coupled devices (CCDs) or photodiode arrays (PDAs) -- the parallel detection of electron energy loss spectra (EELS) has become an important alternative to serial registration. Using parallel detection for recording of energy spectroscopic large angle convergent beam patterns (LACBPs) special selected scattering vectors and small detection apertures lead to very low intensities. Therefore the very sensitive direct irradiation of a cooled linear PDA instead of the common combination of scintillator, fibre optic, and semiconductor has been investigated. In order to obtain a sufficient energy resolution the spectra are optionally magnified by a quadrupole-lens system.The detector used is a Hamamatsu S2304-512Q linear PDA with 512 diodes and removed quartz-glas window. The sensor size is 13 μm ∗ 2.5 mm with an element spacing of 25 μm. Along with the dispersion of 3.5 μm/eV at 40 keV the maximum energy resolution is limited to about 7 eV, so that a magnification system should be attached for experiments requiring a better resolution.

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Optimization of mesa structured InGaAs based photodiode arrays

10.1117/12.2262499 ◽

2017 ◽

Cited By ~ 1

Author(s):

M. Halit Dolas ◽

Kubra Circir ◽

Serdar Kocaman

Keyword(s):

Photodiode Arrays

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Germanium Photodiode Arrays on Silicon-On-Insulator with On-Chip Bias Circuit

IEEE Photonics Technology Letters ◽

10.1109/lpt.2021.3064505 ◽

2021 ◽

pp. 1-1

Author(s):

Keye Sun ◽

Junyi Gao ◽

Robert Costanzo ◽

Ta-Ching Tzu ◽

Steven M. Bowers ◽

...

Keyword(s):

Silicon On Insulator ◽

Photodiode Arrays ◽

On Chip

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Temperature dependence of the dark current in HgCdTe photodiode arrays

10.1117/12.623219 ◽

2005 ◽

Author(s):

F. F. Sizov ◽

J. V. Gumenjuk-Sichevska ◽

I. O. Lysiuk ◽

V. V. Zabudsky ◽

A. G. Golenkov ◽

...

Keyword(s):

Temperature Dependence ◽

Dark Current ◽

Hgcdte Photodiode ◽

Photodiode Arrays

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Lutetium oxyorthosilicate block detector readout by avalanche photodiode arrays for high resolution animal PET

Physics in Medicine and Biology ◽

10.1088/0031-9155/49/18/008 ◽

2004 ◽

Vol 49 (18) ◽

pp. 4305-4319 ◽

Cited By ~ 49

Author(s):

B J Pichler ◽

B K Swann ◽

J Rochelle ◽

R E Nutt ◽

S R Cherry ◽

...

Keyword(s):

High Resolution ◽

Avalanche Photodiode ◽

Animal Pet ◽

Lutetium Oxyorthosilicate ◽

Photodiode Arrays

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Intensity Calibration and Sensitivity Comparisons for CCD/Raman Spectrometers

Applied Spectroscopy ◽

10.1366/0003702934066226 ◽

1993 ◽

Vol 47 (12) ◽

pp. 1965-1974 ◽

Cited By ~ 55

Author(s):

Mark Fryling ◽

Christopher J. Frank ◽

Richard L. McCreery

Keyword(s):

Quantum Efficiency ◽

Figure Of Merit ◽

Instrumental Response ◽

Fiber Optic ◽

Collection Efficiency ◽

Signal To Noise Ratio ◽

Quantitative Comparison ◽

Sample Position ◽

Fiber Output ◽

Photodiode Arrays

A calibrated tungsten source combined with a fiber optic was used to correct Raman spectra for instrumental response. With the placement of the fiber output at the Raman sample position, the product of throughput, collection efficiency, quantum efficiency, and sampled area could be assessed. This product is related to a spectrometer figure of merit, which provides a quantitative comparison of spectrometer sensitivity and signal-to-noise ratio. Four spectrometer configurations were compared to illustrate the approach. An additional feature of the white light calibration is correction of relative Raman peak intensities. This issue is particularly important due to the substantial differences between CCD quantum efficiency curves and those of photomultipliers or intensified photodiode arrays.

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