Hamamatsu News 2 / 2017

ELECTRON TUBE PRODUCTS 23 News 2017 Vol. 2 TPHOB0 200 10 3 10 4 10 5 10 6 300 400 500 Wavelength (nm) Count sensitivity (s - 1 ·pW - 1 ) 600 700 800 H12775 Count sensitivity Photon Counting Head H12775 ND Inspection Industry Security Optical Comms Semicon Prod. Analytical Measurement Drug Discovery Life Science Medical Academic Res. Photon counting head incorporating a 1/2-inch head-on photomultiplier tube The H12775 is a photon counting head incorporating a 1/2-inch head-on photomultiplier tube, a high-voltage power supply circuit, and a photon counting circuit. Photon counting measurements can be made by just supplying +5 V. The effective photosensitive area is 10 mm in diameter which is wider than that of photon counting heads using a TO-8 package photomultiplier tube. Differences from previous model The H12775 is the first photon counting head that incorporates a 1/2-inch head-on photomultiplier tube. Features „ „ Compact and lightweight „ „ Low power consumption „ „ Includes an excess light detection function Applications „ „ Compact photometric equipment for the following fields: • Medical diagnosis • Biotechnology • Chemical analysis • Measurement H12775 Specifications Parameter Specification Unit Spectral response range 300 to 650 nm Input voltage +5 V Effective area 10 dia. mm Count linearity 5 x 10 6 s -1 Output pulse height (50 Ω load) 2.0 V Pulse pair resolution 20 ns Output pulse width 10 ns New Over light detection output +4.0 V at the over light condition 0 V at the normal condition Positive logic PMT Amplifier Pulse shaper Comparator L.L.D. High voltage power supply circuit GND power input +5 V To pulse counter RL 50 Ω Block diagram