Electromagnetic wave sensor

[ Dictionary Public](https://data.bordeaux-metropole.fr/dicopub/#/dico#rt_ondeelectro_p) The dataset provides the measurements made by the [Observatoire des waves](https://www.observatoiredesondes.com/fr/) metropolitan. This wave observatory consists of about thirty sensors installed in the municipalities of our territory that measure exposure to waves. The measured frequency band is very wide as it departs from the FM band (80 MHz) to the highest Wi-Fi frequencies (6 GHz). The waves broadcast by FM, TV, PMR (professional mobile radio), mobile telephony (2G, 3G, 4G, 5G), Wifi, amateur radio, Bluetooth, microwave, etc. are thus taken into account in the measurements carried out. The sensors are installed at a few meters high, mostly on floor lamps. It is the municipalities that choose the locations. They weigh about 1 Kg, operate on battery and have a range of 5 years. The measurements made are transmitted over the SIGFOX low-speed network. Measurements are carried out over a period of approximately 6 minutes every two hours. In the context of the very rapid digital transformation of our society, this wave observatory is an impartial and reliable tool to inform societal debate. Volt per metre (V/m) is the unit of measurement of the intensity of an electric field. Recommendation 1999/19/EC and its [Implementing Decree 2002-775 of 3 May 2002](https://bit.ly/3kpnz5S) define the limit values for exposure to electromagnetic fields for the public in the frequency range from 0 Hz to 300 GHz. The limited exposure values to an electric field, depending on the frequencies, are as follows: **Range of frequencies ** | **V/m limit value ** —|— 0-1 Hz | — 1-8 Hz | 10,000 8-25 Hz | 10,000 0,025-0.8 kHz | 250/f 0.8-3 kHz | 250/f 3-150 kHz | 87 0.15-1 MHz | 87 1-10 MHz | 87/f1/2 10-400 MHz | 28 400-2 000 MHz | 1,375 f1/2 2-300 GHz | 61 This gives, for example, limit values: for a 900 MHz GSM antenna: 41 V/m for a GSM 1.8 GHz antenna: 58 V/m for a UMTS antenna: 61 V/m for wifi and microwaves: 61 V/m for FM radio: 28 V/m for a 5G antenna (3.5 GHz band): 61 V/m For these sensors, it is possible via the Bordeaux Métropole WebServices: * to access current values * to access values at a past T moment * do data aggregation per day, month, etc. The history began in September 2021. A dataset with the [daily history of wave sensors](https://opendata.bordeaux-metropole.fr/explore/dataset/rt_ondeelectro_p_histo_jour/information/) is also available. * * * This data set is refreshed all: 15 Minute(s). Be careful, for performance reasons, this dataset (Table, Map, Analysis and Export tabs) can be updated less frequently than the source and a deviation may exist. We also invite you to use our Webservices (see Webservices BM tab) to retrieve the freshest data.