As we all know, photomultiplier tube as a detector is the best choice for precision detection. However, the emergence of a new type of semiconductor photodetector provides more options for such applications. That is the MPPC, the silicon photomultiplier tube (SiPM). The silicon photomultiplier tube is composed of a number of APDs operating in Geiger mode, and therefore, according to its working principle, it can also be called MPPC (multi pixel photon counter). Although essentially an optical semiconductor device, MPPC has excellent photon counting capability and can be used to detect extremely low light at photon counting levels. Can be widely used in medical , environmental, industrial, academic and other aspects. This new type of detector has the advantage of operating at low voltages with high gain, high photon detection efficiency, fast response, excellent time resolution and wide spectral response range. In addition, it also has anti-magnetic field interference and mechanical shock resistance, which are unique advantages of solid devices. However, for ordinary MPPCs, when used for precision detection, it may be affected by post-pulse and crosstalk to a certain extent, but Hamamatsu introduced a series of MPPCs and modules suitable for precision measurement in late 2015. At the same time, the high photon detection efficiency of the product has greatly improved the crosstalk, post pulse and dark count. New products for precision measurement in the S13360 series MPPC module C13365 (left) and C13366 (right) 1, low crosstalk A pixel that detects a photon may affect other pixels, causing other pixels to generate pulses similar to the output pulse, a phenomenon known as crosstalk. The MPPC for precision measurement uses a structure that suppresses crosstalk, which greatly reduces the occurrence of crosstalk (44% down to 3%) compared to the previous generation. 2, low post pulse When the MPPC detects a photon, the delayed signal may be output separately from the output pulse, and these signals are called post-pulses. Pulses can be maintained at a low level after precision measurement of MPPC. 3, low dark count Improvements in materials and wafer process technology have reduced dark counts by about half compared to previous generations. 4, a wider working voltage range The MPPC operating voltage (Vop) can be expressed as breakdown voltage (Vbr) + overvoltage (Vov). As the operating voltage increases, gain and photon detection efficiency increase, but at the same time, noise components such as crosstalk and dark count increase. In previous products, increased operating voltage increased the noise component significantly, and MPPC for precision measurement greatly improved this, which also enabled new products to be used for high voltage operation, resulting in higher gain and better. Photon detection efficiency. The emergence of MPPC (silicon photomultiplier tube) provides a new possibility for precision detection, but faced with specific application requirements, we still need professional judgment in the choice of detectors. Hamamatsu can also provide you with such professionalism. Detector selection help, as well as customized services. With a full range of photodetectors with unique features and crystals, integrated circuits (ASICs), we can find the most suitable solution for precise detection needs from a more professional and objective perspective.
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