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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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C1963 датащи(PDF) 2 Page - PerkinElmer Optoelectronics |
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C1963 датащи(HTML) 2 Page - PerkinElmer Optoelectronics |
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2 / 11 page  Description PerkinElmer Optoelectronics, for- merly EG&G Optoelectronics, is pleased to introduce the Channel Photomultiplier (CPM), a new ultra high sensitivity optical detector which replaces conventional photo- multipliers (PMTs) and avalanche photo diodes (APDs). This device uses a unique detector principle, re- sulting in a compact design with ul- tra high gain, high dynamic range, extremely low dark current, and fast response. This high-performance detector offers fundamental advantages for analytical instrumentation applications such as emission spectroscopy, flourescence, atomic absorption spectroscopy, and bio and chemo luminescence. The CPM also delivers important advan- tages in life science products, indus- trial and medical equipment, and high- energy physics. Principle of Operation The CPM, like conventional photo- multiplier tubes, converts a very low light level into photoelectrons by a semitransparent photocathode de- posited on the inner surface of the entrance window. On their way from the cathode to the anode the photo- electrons pass through a narrow, se- miconductive channel. Each time the electrons hit the inner wall of the curved channel, multiple secondary electrons are emitted. This effect oc- curs multiple times along the path, leading to an avalanche effect with a gain exceeding 108. The curved sha- pe of the glass tube improves the multiplication effect. Features • Ultra high anode sensitivity up to 107 A/W • Extremely low dark current, typically 3pA @ 106 gain • Very low equivalent noise input (down to 10 -17 W) • Very high stability in dark current (no ”bursts”) • High gain exceeding 108 • Very high dynamic range • Compact dimensions • Wide spectral response through multiple window materials • High resolution • Fast response time • High immunity to magnetic fields • Rugged design Cathode Channel-Entrance Channel-End Anode Coax -20…-50 V black 1 Mohm Proposal for Power Supply -HV 100 V -HV red -HV +50…+300 V blue Physical Specification CHANNEL PHOTOMUL TIPLIER PRINCIPLE OF OPERA TION When compared to conventional PMTs, the CPM improves anode sensitivity by one order of magni- tude, while lowering dark current by one to two orders of magnitude. The noise level shows extreme stability over time, with no ”bursts.” The extremely low dark current results in a higher dynamic range than con- ventional PMTs and extends detec- table limits for many applications. The CPM can be used in analog-DC mode, single photon counting mode, and in nuclear spectroscopy (when coupled to scintillation materials like BGO, LSO, Nal, etc.). PerkinElmer Optoelectronics offers a choice of window materials and photocatho- des to cover the spectrum from 115 nm (UV range) to 900 nm (NIR). The new detector is a small, head-on type with a total diameter of 10.5 mm including encapsulation. PerkinElmer Optoelectronics also offers custom configurations for specific applica- tions. |
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