What are UV torches?
UV torches are handheld devices that emit ultraviolet (UV) light. They are similar to regular flashlights, but they emit a different type of light. UV light is invisible to the human eye, but it can be seen by some animals, such as insects. UV torches are used for a variety of purposes, including detecting counterfeit currency, inspecting fluorescent dyes, finding hidden stains, detecting gemstones and Opal mining.
How do UV torches work?
UV torches work by emitting ultraviolet light. This light is produced by an electric arc or by a chemical reaction. The UV light is then focused into a beam by a lens. For light to be considered ultraviolet it is often considered to but under 400nm this is where on the light spectrum the light begins to change from a violet (blue) light to ultra violet. The lower the NM the more invisible to the human eye the light becomes.
What are UV torches used for?
UV torches are used for a variety of purposes, including:
- Detecting counterfeit currency: UV light can be used to detect counterfeit currency because some of the security features on genuine banknotes are only visible under UV light.
- Inspecting fluorescent dyes: Fluorescent dyes are substances that glow when exposed to UV light. UV torches can be used to inspect fluorescent dyes to see if they are evenly distributed and to check for any damage.
- Finding hidden stains: UV light can be used to find hidden stains that are not visible to the naked eye. This is because some stains fluoresce under UV light.
- Checking for leaks in air conditioning systems: UV light can be used to check for leaks in air conditioning systems. This is because the refrigerant in air conditioning systems fluoresces under UV light.
- Identifying insects: Some insects fluoresce under UV light. This can be used to identify insects and to attract them to traps.
- Sterilising surfaces: UV light can be used to sterilise surfaces. This is because UV light kills bacteria and other microorganisms.
- Opal mining – this industry relays on the the UV light to spot Opal in the dense earth were otherwise human eye will not be able to see. Also key is to be able to light up opal in small and tight areas under the ground.
These types of torches can also be known as Black light torch or ultraviolet torch
Types of UV torches
There are two main types of UV torches: long-wave UV torches and short-wave UV torches. Long-wave UV torches emit light with a wavelength of 365 nm. Short-wave UV torches emit light with a wavelength of 254 nm. Long-wave UV torches are safer to use than short-wave UV torches because they do not emit as much harmful radiation.
How to choose the right UV torch
The best type of UV torch for you will depend on your needs. If you need to detect counterfeit currency, then you will need a long-wave UV torch. If you need to inspect fluorescent dyes or find hidden stains, then you can use either a long-wave or a short-wave UV torch. If you need to sterilize surfaces, then you will need a short-wave UV torch.
Safety of UV torches
UV torches can be dangerous if used incorrectly. They can cause eye damage and skin burns. It is important to always wear safety goggles and gloves when using a UV torch. You should also avoid exposing your skin to direct UV light for long periods of time. Spoken about on the Waveform lighting page
Conclusion
UV torches are versatile tools that can be used for a variety of purposes. They are safe to use if used correctly. If you are considering purchasing a UV torch, it is important to choose the right type of torch for your needs.