Libelium designed a wireless sensor network for measurement and controlling Ultraviolet Solar Radiation levels in the environment especially during summer. Mostly farmers are exposed to UV solar radiation when they are working for agricultural business. Libelium designed a new Agriculture Sensor Board for their Waspmote wireless sensor network platform integrates a Radiation Sensor (SQ-110) which works in the 400-700nm band, the optimum to control the quality of the photosynthesis of the plants. However, this sensor board is ready to use the SQ-100 Radiation Sensor which works in the BUV radiation band (240-400nm). This means we can use the Agriculture Sensor Board not only to detect the environment conditions for the plants but to control if the impact of the sun is harmful in a certain place for the people who are there.

Health Effects of Ultraviolet Solar Radiation

Health Effects of UV Solar RadiationUltraviolet solar radiation is involved in many biochemical processes, in the case of human beings in the production of vitamin D and melanin, but overexposure may result in highly harmful effects, such as erythema, sunburn and even skin cancer. This way, it comes to be of great importance to know the intensity of the radiation in a determined instant in order to choose the right protection and avoid the exposure in those moments when it may result more harmful. Skin cancer is caused primarily by exposure to ultraviolet (UV) radiation.

Ultraviolet Radiation Sensor System Network

Ultraviolet Radiation Sensor Network Transmitter for Protection from Ultraviolet Solar RadiationThe Libelium’s Waspmote wireless sensor network platform along with the Agriculture Sensor Board allows the creation of distributed UV radiation measurement points at any place in order to cover a big area such as the coasts where people moves each summer to enjoy the beaches.

Waspmote wireless sensor network can last for years with a single battery; however, it can also be powered from a solar panel getting perpetual lifetime. As the communications are doing wiressly using the ZigBee and GPRS protocols the information can be transmitted at any local or central point where can be processed and stored, generating alarms when the values are in the High or Very High level in the UV Index.

The sensor outputs a voltage proportional to the energy received in the ultraviolet region of the spectrum (between 240nm and 400nm of wavelength) with a sensitivity of 0.15mV for each micromol per square meter per second (µmol/m²s).

To calculate the received power in watts per square meter from this unit, which indicates the number of photons that reach the surface of the sensor each second, it is necessary to know the exact distribution of the radiation along the spectrum. This means knowing in detail which intensity of radiation corresponds to each frequency, since the energy transmitted by a photon is a function of the frequency associated to it.