Recently, a research team at Northeastern University, which did research for the Department of Defense Advanced Research Projects Agency (DAPRA), introduced a new sensor that stops power and rest during periods of signal transmission interruption.
It is understood that at present, the most advanced sensors use active electronic components to detect the signal, and even in the absence of signal transmission state, they will continue to consume electricity, which greatly limits the life of the sensor, Therefore indirectly hindered the development of things.
This infrared digital sensor will break this bottleneck and make it smarter. It is through the detection of infrared to achieve its own open, although the human eye can not see the infrared, but life, such as humans, cars and fire can send infrared signals, so when the infrared signal appears, the sensor automatically opens, and when the signal Disappear, the sensor will automatically shut down, into hibernation.
The infrared digital sensor is a plasma enhanced micro-mechanical lighting switch (PMP) composition, from the internal mechanism point of view, when the ray appears, the sensor will be programmed according to the spectral wavelength requirements to detect the received optical signal, And convert the optical signal into electrical energy, make the two internal electrical contacts produce the conductive channel, thus turning on and continuing to supply power for the operation of the sensor, and does not need the external power to supply power for it.
In addition, the output of the sensor is a digital signal, that is, the output has an off-state transition characteristic of an on / off conductance "1012 and a subthreshold slope" 9 dec nW-1 when the sensor is exposed to infrared light.
In this regard, Troy Olsson, DAPRA's project manager, describes in his blog: "First, the energy of the infrared signal activates the sensing element and contributes to the physical movement of the critical sensor elements; these movements then maintain the mechanical closure of the open-circuit element State, which in turn keeps the components constantly detecting the infrared signal, a cycle that happens to be a continuous power supply. "
Regarding the use of this technology, Olsson also said that each sensor will be based on the needs of the use of a number of specific sensing elements, each element will be tuned to absorb a specific wavelength of light, so that they will be able to analyze complex infrared spectroscopy logic . Therefore, in practice, we can produce specific sensor components depending on the energy source and requirements.
All along, the layout of wireless sensor networks in harsh environments, battery life issues are a major issue, it is clear that this infrared digital sensor provides solutions and new ideas for such problems. In addition, with the rise of the "no-man" concept in many industries and the consideration of waste of power and other issues, the use of such sensors is also preferable to reduce costs.
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