Vidicons

An X-ray image of a test object is converted by a X-ray TV unit (4), and complete video-signal from it is supplied to specialized computer (5). For conversion of X-ray images series X-ray vidicons LI-444 and LI-473 can be used or experimental X-ray vidicons of the same dimensions with a Be input window [2] sensitive to soft X-radiation developed in Introscopy Institute. >. ... 

Application of experimental devices allows to perform NDT of products, made out of materials of low density (Al-Mg - alloys, Be, plastics) with high defectoscopic sensitivity up to 0,5 %. Inch-size X-ray vidicons used complete with microfocal X-ray tubes and X-ray image enlargement method allow to obtain resolution up to SO pairs of lines per mm. 

The use of experimental X-ray vidicons, original technique of X-raying and computer image processing allowed to improve basic parameters of XTVI and to achieve higher defectoscopic sensitivity and greater thickness of X-rayed materials and products. 

Mass spectrometer. An instrument in which ions are analyzed according to their mass-to-charge ratio (m/z) and in which the number of ions is determined electrically (or via scintillator, vidicon, etc.). 

Video links Video recording Video sensor Video tape Video tapes Vidicon Vidicons Vidicon tubes Vifilcon-A... 

Tin oxide and indium oxide [1312-43-2] Iu202, are other important semiconductors that are doped to increase conductivity. Sn02, Iu202, Ti02, and in particular, SrTiO, are transparent to visible light and are often used as transparent electrodes, for example, on vidicon tubes. 

Figure 6 LEED diffractometer. The vidicon camera can be interfaced with a computer to...

The main detectors used in AES today are photomultiplier tubes (PMTs), photodiode arrays (PDAs), charge-coupled devices (CCDs), and vidicons, image dissectors, and charge-injection detectors (CIDs). An innovative CCD detector for AES has been described [147]. New developments are the array detector AES. With modem multichannel echelle spectral analysers it is possible to analyse any luminous event (flash, spark, laser-induced plasma, discharge) instantly. Considering the complexity of emission spectra, the importance of spectral resolution cannot be overemphasised. Table 8.25 shows some typical spectral emission lines of some common elements. Atomic plasma emission sources can act as chromatographic detectors, e.g. GC-AED (see Chapter 4). 

Several other principles have been used to build X-ray detectors. For instance, ID detectors have been realized by diode arrays. 2D detectors have been realized by conversion of X-rays to visible light, photon amplification, and a television camera (VIDICON). CCD detectors have outperformed both diode arrays and the VIDI-CON. 

Figure 4. Vidicon rapid scan UV-visible spectral changes on the addition of acid to Ni(III)(H.sG4a), corresponding to the coordination changes in Figure 2. Absorbance decreases with time for spectra recorded at 0.02, 0.09, 0.16, 0.23, 0.30, 0.37,...

Silicon intensified Fluorescence Vidicon -Polychromator spectrum-... 

D. L. Folia and J. R. Choi, Monolithic Pyroelectric Bolometer Arrays N. Teranishi, Thermoelectric Uncooled Infrared Focal Plane Arrays M. F. Tompsett, Pyroelectric Vidicon... 

Fig. 14. Scheme of the vidicon tube. (1) Scanning beam (cathode potential F = 0 volt) (2) gauze (3) dye film (4) transparent supporting electrode (potential +30 volt) (5) amplifier (6) galvanometer... 

Some characteristics of organic vidicons are given below. 

Fig. 15. Dependence of photocurrents (measured in the vidicon arrangement) on light inten-sity log /phot = / ( ) (1) Sb2S3 (2) phthalocyanine ( — 5500 A)...

The results obtained hitherto are of interest e.g. for color television, for medically important IR vidicons 3>, and for the construction of storage vidicons. Further systematic studies should test as many dyes as possible for possible use in television image reproduction6 ). 

The observations of the lithium resonance line at x6708.8 A were carried out with a SIT vidicon detector attached to the coudi spectrometer of the 1.5 m telescope of the Tartu Astrophysical Observatory. The sample of stars observed consists of 70 K0 - K5 and 75 MO - M4 giants. A set of spectra of K giants with different strengths of lithium resonance doublet is shown in Fig. 1. 

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