The evaluation of a pyroelectric detector with a sprayed carbon multi-wall nanotube black coating in the infrared

Fabrication of hard-coated optical absorbers with microstructured surfaces using etched ion tracks: Toward broadband ultra-low reflectance

“…The low density, however, makes VACNT blacks too fragile and susceptible to dust blow off as well as to mechanical contact. Condensed carbon nanotubes are significantly more robust than as-grown VACNTs [19][20][21][22], while high-density carbon nanotube aggregates exhibit higher reflectance than VACNT blacks [23]. Achieving both ultra-low reflectance and mechanical stability is a critical issue, affecting the practical usability of this material for broad applications.…”

Blind estimation of number of motion multi-human targets in wireless pyroelectric infrared sensor networks

“…And some miniature and physically scattered pyroelectric infrared sensors, which have certain ability of calculation, can perform complex tasks on the basis of mutual communication and collaboration. Therefore, researchers have attempted to combine the advantages of both so as to compose distributed pyroelectric infrared sensor networks in order to realize a low-cost human tracking and recognition system [2,4,5]. This kind of recognition system usually arrays by many pyroelectric infrared sensor nodes in multiple directions to satisfy signal acquisition and spatial coding of human targets [6,7].…”

The evaluation of the performance of two pyroelectric detectors with vertically aligned multi-walled carbon nanotube coatings

“…One type of coating that combines high absorptivity, low thermal capacity and high thermal conductivity, and can act effectively as a black coating for thermal detectors is a coating consisting of multi-walled carbon nanotubes (MWCNTs) [3].…”

“…The easiest way to apply MWCNTs as black coatings is through sprayed coatings [4]. Carbon nanotubes are suspended in a volatile liquid with a binder and sprayed onto a detector active area by means of an airbrush.…”

“…The volatile liquid is allowed to evaporate using gentle heat, leaving a coating of MWCNTs deposited on the substrate. However, this method of depositing MWCNTs produces coatings of uneven thickness, which can affect the spatial uniformity of response of the coated detector [4]. Furthermore, the absorptivity of sprayed MWCNT coatings is high, but is limited to between 90% and 95% [5].…”