Advanced Time-Correlated Single Photon Counting Techniques - download pdf or read online

By Wolfgang Becker

ISBN-10: 3540260471

ISBN-13: 9783540260479

ISBN-10: 3540288821

ISBN-13: 9783540288824

Time-correlated unmarried photon counting (TCSPC) is a amazing process for recording low-level mild signs with tremendous excessive precision and picosecond-time answer. TCSPC has constructed from an intrinsically time-consuming and one-dimensional approach right into a quickly, multi-dimensional strategy to checklist mild signs. So this reference and textual content describes how complex TCSPC concepts paintings and demonstrates their program to time-resolved laser scanning microscopy, unmarried molecule spectroscopy, photon correlation experiments, and diffuse optical tomography of organic tissue. It offers sensible tricks approximately developing appropriate optical structures, picking and utilizing detectors, detector defense, preamplifiers, and utilizing the keep an eye on positive aspects and optimising the working stipulations of TCSPC units. complex TCSPC innovations is an critical device for everybody in examine and improvement who's faced with the duty of recording low-intensity gentle signs within the picosecond and nanosecond diversity.

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Additional resources for Advanced Time-Correlated Single Photon Counting Techniques (Springer Series in Chemical Physics) (Springer Series in Chemical Physics)

Example text

Several options are shown in Fig. 4. g. between Raman scattering and fluorescence or between fluorescence and phosphorescence. Gate pulse Signal Gate pulse Raman Signal Fluorescence Gate Pulse Raman Signal Fluorescence Background Fig. 4 Using the gate function to suppress background counts between the signal pulses (left), to reduce the fluorescence signal in Raman measurements (middle), and to suppress the Raman signal in fluorescence measurements (right) The maximum count rate of a gated photon counting system can be very high.

Because the address switching rate is controlled by a quartz oscillator, the time scale is accurate within a few ppm. However, the direct implementation of the principle shown in Fig. 8 delivers a relatively poor time resolution and count rate. The limitation is the speed of the memory. For a single sweep at least one write cycle must be possible per address, and for accumulation of subsequent sweeps one read-modify-write cycle per address is required. Therefore, the time channel width is 10 ns and the count rate about 100 MHz, at best.

E. be controlled from a free-running scanner. In the active mode the sequencer runs a time-controlled sequence through the pixels and lines of the image, and sends the frame clock, line clock, and pixel clock pulses to the scanner. The active mode is called „Scan Sync Out“ and is often used for slow-scan imaging in conjunction with piezo scan stages. Scan Sync Out can be combined with multidetector operation and multiplexing. Of course, the memory size of the TCSPC module limits the number of detector and multiplexing channels and the number of pixels in the image .

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Advanced Time-Correlated Single Photon Counting Techniques (Springer Series in Chemical Physics) (Springer Series in Chemical Physics) by Wolfgang Becker

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