Question

what to detect in the UV

Answer 1

This is not possible. But if blast the sun so this is impossible.

Answer 2

Answer:

Ultraviolet (UV) radiation is an invisible form of electromagnetic radiation with a very short wavelength between 200 nm and 400 nm. The relevant UV spectral range is normally subdivided into three bands: UVA (315-400 nm), UVB (280-315 nm) and UVC (200-280 nm). Based on its characteristics, e.g. germicidal effect and photolysis, UV radiation is widely used for air & water purification, industrial & cosmetic curing, surface inspections as well as indoor gardening.  

UV light can be measured and monitored, before you choose the instrument, it is to be understood if you need it to measure the uv emittance from the sun light. or from a uv bulb.

again if its UV bulb  blacklite, or curing or germicidal lamp, various istruments are available today to  give accurate measurements of the uv energy and wavelength.

Explanation:

The intensity of UV radiation is measured in the units of milliwatts per square centimeter (mW/cm2) which is energy per square centimeter received per second. Also, it is measured in the units of millijoules per square centimeter (mJ/cm2), which is energy received per unit area in a given time.