Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

how to measure the wavelengths of ultraviolet radiation isn't it invisible? it's possible to measure visible radiation but how to measure invisible radiation?

share|improve this question

2 Answers 2

It's common to measure spectra in the non-visible region and UV or infra-red spectrometers are available off the shelf. Google for many, many manufacturers of the kit. Also see the Wikipedia articles on UV spectroscopy and infrared spectroscopy.

Typically UV and IR spectrometers will use a diffraction grating to disperse the light and a photomultiplier tube to detect the radiation.

share|improve this answer

Three different ways (at least).

1) Use a detector, like a photodiode or photomultiplier, which responds to UV by producing electrons when hit by photons even if those photons are not visible,

2) Use a detector, like a bolometer, which measures the temperature rise produced when UV energy is absorbed, or

3) Coat a visible-only detector with a phosphor which emits light when hit with UV, then detect the emitted visible light.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.