Detectors signal processing

What are the six basic elements of a mass spectrometer (sample introduction, ion source, mass analyzer, detector, signal processing and computer). 

Scalogram applied to single detector signal allows notch localization along the main axis of the tube. However, no circonferential localization is possible so far. Of course, this objection can be bypassed by computing the scalogram simultaneously for the 16 detectors. But then the difficulty lies in the representation process, because of the need of real 3 dimensional representation. 

Signal processing in mechanical impedance analysis (MIA) pulse flaw detectors by means of cross correlation function (CCF) is described. Calculations are carried out for two types of signals, used in operation with single contact and twin contact probes. It is shown that thi.s processing can increase the sensitivity and signal to noise ratio. 

The modern Russian MIA flaw detectors use pulse version of the method [1-3], which peirnits to produce very portable (0.7 - 1.5 kg) and simple instruments, convenient especially for in-service testing. The objects to be tested are multilayer structures of reinforced plastics, metals and other materials honeycomb panels, antenna fairings, propellers, helicopter rotors and so on. In mentioned instruments amplitude-frequency analog signal processing is used. 

Correlative signal processing in MIA pulse flaw detectors is an effective way to increase the sensitivity and signal to noise ratio. Instruments with such processing system should be provided with a device for adjusting and sustaining initial phases of both current and reference pulses. 

Detector mosaic Buffer IC Switch network Signal processing... 

The results in Table 12 are considered very conservative by the North American Rockwell authors, since they were not obtained under optimum conditions. Such conditions must take into account the.type of luggage, conveyor belt speed, detector size, type of signal process-... 

Electrically modulated infrared spectroscopy, ( EMIRS). In all three external reflectance approaches the signal processing technique serves two purposes (a) to remove the contributions to the reflected ray that do not change, e.g. the detector response, the source emission envelope, the solvent,... 

In context with methane detection during offshore oil drilling, another infrared fiber optic methane sensor was reported25. The detector comprises 3 main units a microcomputer-based signal processing and control unit, a nonconducting fiber optic gas sensor, and an optical fiber cable module. The system operates at an absorption line of methane where silica fibers have very low losses. 

In this method an Ar+ laser-pumped rhodamine 101 laser was used as the heat and probe source. The signal from a silicon photocell with a 1 mm2 photosensitive surface, which was used as a laser radiation detector, was processed with an inexpensive personal computer. The detector limit is 5 pg of phosphorus/ml. 

The work has shown the diversity of fluorescence-based thermometry schemes, materials, signal processing arrangements, and applications. In addition, a close agreement with theoretical predictions on material performance gives confidence to the assessment of new materials for such uses. Probe sizes are potentially smaller and more convenient due to optical source and detector developments. Thus the future for fluorescence thermometry is bright, with the expectation of a range of new ideas in the field in the future. 

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