This document discusses different devices that can be used to detect ultraviolet radiation, including photodiodes and photomultiplier tubes. It also describes the wavelength ranges of ultraviolet radiation, including UVA, UVB, and UVC. Exposure to UV rays can affect the human body, and UV radiation has various applications like disinfection, medical imaging, and curing polymers.
3. Ultraviolet radiations can be detected using devices
like:
• A photodiode is a type of photodetector capable
of converting light into either current or voltage,
depending upon the mode of operation. The
common, traditional solar cell used to generate
electric solar power is a large area photodiode.
4. • Photomultiplier tubes (photomultipliers or PMTs for
short), members of the class of vacuum tubes, and more specifically
phototubes, are extremely sensitive detectors of light in the
ultraviolet, visible, and near-infrared ranges of the electromagnetic
spectrum. These detectors multiply the current produced by incident
light by as much as 100 million times (i.e., 160 dB), in multiple
dynode stages, enabling (for example) individual photons to be
detected when the incident flux of light is very low.
5.
6. • Ultraviolet radiation has wavelengths shorter then
• Ultraviolet radiation has a wavelength between 200nm and
400nm.
• UV type C (UVC), 100 - 280 nm.
• UV type B (UVB), 280 - 315 nm.
• UV type A (UVA), 315 - 400 nm.
• Natural sunlight contains UV rays. Intense exposure to UV
rays can affect the human body
Most of the solar UV radiations are UVA.*
• UVB de narrow band (311nm) and they have the lowest risk
of causing cancer or solar burns.
7. • By wavelength:
• 13.5 nm: Extreme Ultraviolet Lithography
• 230-365 nm: UV-ID, label tracking, barcodes
• 230-400 nm: Optical sensors, various instrumentation
• 240-280 nm: Disinfection, decontamination of surfaces and water (DNA
absorption has a peak at 260 nm)
• 200-400 nm: Forensic analysis, drug detection
• 270-360 nm: Protein analysis, DNA sequencing, drug discovery
• 280-400 nm: Medical imaging of cells
• 300-320 nm: Light therapy in medicine
• 300-365 nm: Curing of polymers and printer inks
• 300-400 nm: Solid-state lighting
• 350-370 nm: Bug zappers (flies are most attracted to light at 365 nm)
