Used To Detect The Design Of Electroluminescent Single Photon Counter

The present method for testing aging and breaking-down property of polymer is usually carried out by testing its electrical property. This conventional is of low reliability. This paper has established a new method for testing the aging and breaking-down property of polymer to develop new types of insulating materials by probing the electroluminescence of insulated polymers, which is in the highest flight at home. This paper mainly discusses the design of the single-photon-counter. Electroluminescence (EL) is a weak light with its power under 10-16W, which can,t be detected with conventional method. We consider testing it using photon counting mode of photomultiplier PMT to transform light signals into electric signals. Much of the noise can be eliminated with an amplitude discriminator. The light can be counted with a pulse counter. The value counted in a certain length of time is in accordance with that of light power. This system used for testing weak light is called single-photon counter. The most important parameter in the single-photon counter is the total sensitivity. Noise level should be decreased and quantum efficiency should be raised in order to improve the total sensitivity, which needs a better cooling system. The multiplication system of the electron-multiplier phototube is based on electronic voltage. So, it is especially important to choose a suitable PMT and reasonably design PMT disparted-voltage-device. We adopt double alkali cathodal tube 9789QB, which was made by EMI corporation in England , as our photomultiplier, whose spectrum ranges between 300nm to 650nm, with less noise counters and single-photon apices, which make it suitable as a single-photon-counter. The disparted-voltage device is designed in a reasonable way and the cooling system of iquefied nitrogen which makes it small in size, simple in structure, easy in processing, cheap in cost and good in performance. We also magnify the signal with new IC amplifier, deduct yawp counters, design system to desl with data,total system is control by singlechip and can count in fastness time range and deal with data. This paper is of great importance in the testing of property of the polymer and in the development new type of insulating materials. And it can also be extended to other weak light testing system.