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Advantages of Photomultiplier tube | Disadvantages of Photomultiplier tube

This page covers advantages and disadvantages of Photomultiplier tube (PMT). It mentions Photomultiplier tube (PMT) advantages and Photomultiplier tube (PMT) disadvantages.

Introduction:
• PMTs (Photomultiplier Tubes) are used for light detection of very weak signals.
• It is photo-emissive device in which absorption of photon results in emission of electron.
• It is one of the class of vacuum tubes also known as vacuum phototube.
• It is visible range photon sensor.
• Earlier PMTs are of larger size having glass vacuum envelopes, now they are available in smaller sizes.
• Now-a-days PMTs are replaced by avalanche photodiodes, but still they are in use in variety of applications such as Raman spectrophotometry, Fluorescent molecular tagging applications and single bubble sonoluminescence.


Photomultiplier Tubes

Advantages of Photomultiplier tube (PMT)

Following are the advantages of Photomultiplier tube (PMT):
➨Higher responsivity in A/W
➨Lower dark current
➨High output S/N ratio
➨Low transport delay
➨Wide spectral response
➨High stability

Disadvantages of Photomultiplier tube (PMT)

Following are the disadvantages of Photomultiplier tube (PMT):
➨Mechanically fragile (made of glass envelope).
➨Shapes and sizes are limited and are physically large.
➨Need stable high voltage power supplies.
➨Expensive, available in hundreds of dollars.
➨Responsivity affected by magnetic fields, hence it requires magnetic shielding in critical applications.
➨It requires cooling to LN2 temperatures for noise reduction in critical applications.



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