Radiation concern

Posted on Dec 26, 2011 | 2 comments

One of the concern about the monbaby device is radiation safeness, especially it is going to be used on the little babies who are more sensitive to environmental stimulus.

Radiation of radio frequency (RF) devices are measured by Special absorption rate (SAR). It  is a measure of the rate at which energy is absorbed by the body when exposed to a radio frequency electromagnetic field. It is defined as the power absorbed per mass of tissue and has units of watts per kilogram (W/kg). A general rule of thumb is, higher emission power would increase the SAR measurement.

Here are some sample facts and measurement of SAR for different RF devices:

  • Cellphones in US are limited to 1.6W/kg by regulation
  • Apple iPhone 4 : 1.17W/kg
  • Baby monitors  range between 0.01-0.08W/kg
  • Bluetooth devices about 0.001W/kg
  • There is no public measurement data found for BLE yet, but given BLE has even lower power emission than Bluetooth, the SAR number should be very insignificant to be compared.

Bluetooth technology has such an insignificant radiation that in fact, this is one of the reason why a lot of bluetooth earpieces came out in the market after cellphones become our daily routine, to reduce the radiation we are exposing to when making calls.

Bluetooth and Bluetooth low energy technology are both using 2.4-2.5GHz band, which is the same as the common FM radio.


2 Responses to “Radiation concern”

  1. What is the transmission output power of your device?

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