When the light’s absolute magnitude is extremely low, as it is in applications like Raman spectroscopy, fluorescence analysis, and chemical or biological luminescence analysis, photon counting is an efficient method for detecting very low levels of light.
Quantum dots and compound semiconductors, among other light-emitting materials, are examples of those whose intensity and spectrum are measured in study labs using photomultipliers. In numerous spectrophotometers, photomultipliers are used as the monitor.
GLOBAL PHOTON COUNTING PMT DETECTION SYSTEM MARKET SIZE AND FORECAST
The Global Photon Counting PMT Detection System market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
The initial devices developed that can identify single photons are photomultiplier tubes (PMTs) (Geiger counters can also count individual photons, but only of the gamma-radiation variety).
Many other photon-counting methods have been developed since the invention of the PMT, including silicon photomultipliers (SiPMs), avalanche photodiodes (APDs), single-photon avalanche diode arrays (SPADs), superconducting nanowire single-photon detectors (SNSPDs), and microchannel plates (MCPs), which are actually a small-scale version of the PMT with numerous parallel channels. Light immediately interacts with the electrons in the detector material in a photoemissive detector.
An electron is liberated by a received photon, and the extra energy is transformed into the kinetic energy of the electron. When electrons have enough moving energy, they can break free from the surface.
The cathode photocurrent in PMTs is created by the electrons that are released in this manner. An applied voltage causes the electrons to move in the direction of the anode, resulting in a current that can be proportional to light strength over a range of six to eight orders of magnitude.
The electron multiplier component of a PMT increases the photocurrent through secondary emission. The currents generated by this low-noise process are orders of magnitude larger than the original photocurrent. In the near-UV and visible ranges, PMTs are more sensitive than any other detection.
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