Silicon photodiode arrays

The use of a linear detector array in the image plane of a polychromator in place of the fluorescence monochromator in Figure 12.1 enables the parallel data accumulation of complete fluorescence spectra. Silicon photodiode arrays, operated in a CCD mode(34) are the most widely used detector elements. The spectral response of the diodes enables fluorescence to be detected from the near-UV up to ca. 1100 nm with a peak response in the near-IR. Up to 8192 elements are now available commercially in a single linear array at low cost. However, the small length of each element (ca. 10 [im) presently limits sensitivity and hence cylindrical lens demagnification is often necessary. 

The performance characteristics of four optoelectronic image detectors (OIDs) are discussed. The detectors discussed are the silicon intensified target vidicon (SIT), the intensified SIT, the intensified silicon photodiode array detector (ISPD), and the self-scanned photodiode array detector. The main objective of the paper is to provide research workers interested in applying OIDs to a particular application with comparative performance information so that the best detector for a particular application may be selected. 

MCP/SPD (ISPP-Inten8ified Silicon Photodiode Array Detector)... 

Figure 3. Dark charge pattern of a preselected silicon photodiode array (Reticon RL-512SF). Note that the first 20 diodes of this particular device have significantly higher dark levels. Detector conditions (Princeton Instruments, Inc. model IRY-512) temperature, -20°C and integration time, 50 s.

We employ method B to study effects of this type. In this mode, our apparatus yields relative high-resolution fluorescence spectra at different time windows after excitation of the sample by the 355 nm pulse. The spectra are acquired by the upconversion method. The upconverted fluorescence spectrum is recorded simultaneously at all monitored wavelengths by an optical multichannel analyzer. It is constructed from a poly-chromator (HR320 Instruments SA) and an intensified silicon photodiode array detector (Princeton Applied Research Model 1412). The detector is interfaced to our Cromemco computer. 

Antcliff, R. R., Hillard, M. E., and Jarrett, O. "Intensified Silicon Photodiode Array Detector Linearity Application to Coherent Anti-Stokes Raman Spectroscopy." Applied Optics 14 (1984) 2369. 

The optical detection systems used in MIPs are the same as those used for other atomic spectrometers and can be either single or multichannel. Fourier transform-based spectrometers have also been used. Conventional optical systems are best designed if the plasma is viewed from the exit of the discharge tube, as is possible with the TMqio type cavity, rather than through the walls of the discharge tube, which become etched. The commercially available AED uses a computer-controlled silicon photodiode array detector which has multielement detection capability over segments of spectra. In recent years, MIP sources have also been investigated as ion sources for mass spectrometry. 

SRXRD patterns were measured during welding by positioning the beam at a predetermined location with respect to the welding electrode. A 50 mm, 2048-element position sensitive silicon photodiode array detector was used to record the diffraction patterns. The detector together with the associated ST 121 data acquisition system was manufectured by... 

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