Liquid and solid organic photocathodes

Peskov, V.; Charpak, G.; Miné, P.; Sauli, F.; Scigocki, D.; Séguinot, J.; Schmidt, Werner F.; Ypsilantis, T.

doi:10.1016/0168-9002(88)90872-8

Cited by 48 publications

(4 citation statements)

References 19 publications

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“…Calculations and measurements agree except under two conditions: low temperatures such as T < 300 K; and light introduced through the top window. This discrepancy arises as a consequence of the contribution of the EF absorbed layer condensed on the top electrode of the S-RETGEM (see [15,17] for details). An examination of the results presented in [6] indicates that adding of the excess of EF to the chamber produces a higher sensitivity compared to the responsiveness of the chamber filled with the saturated pressure of the EF at room temperature.…”

Section: Temperature Stability Testsmentioning

confidence: 99%

Progress in the development of a S-RETGEM-based detector for an early forest fire warning system

Charpak¹,

Benaben²,

Breuil³

et al. 2009

J. Inst.

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In this paper we present a prototype of a Strip Resistive Thick GEM (S-RETGEM) photosensitive gaseous detector filled with Ne and ethylferrocene (EF) vapours at a total pressure of 1 atm for an early forest fire detection system. Tests show that it is one hundred times more sensitive than the best commercial ultraviolet (UV) flame detectors; and therefore, it is able to reliably detect a flame of ~1.5x1.5x1.5 m 3 at a distance of about ~1km. An additional and unique feature of this detector is its imaging capability, which in combination with other techniques, may significantly reduce false fire alarms when operating in an automatic mode.Preliminary results conducted with air-filled photosensitive gaseous detectors are also presented. The approach's main advantages include both the simplicity of manufacturing and affordability of construction materials such as plastics and glues specifically reducing detector production cost. The sensitivity of these air-filled detectors at certain conditions may be as high as those filled with Ne and EF. Long-term test results of such sealed detectors indicate a significant progress in this direction.We believe that our detectors utilized in addition to other flame and smoke sensors will exceptionally increase the sensitivity of forest fire detection systems. Our future efforts will be focused on attempts to commercialize such detectors utilizing our aforementioned findings. * The sensitivity of the class -1 UV detectors is comparable to the sensitivity of the best commercial IR detectors [7].

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Section: Temperature Stability Testsmentioning

confidence: 99%

Progress in the development of a S-RETGEM-based detector for an early forest fire warning system

Charpak¹,

Benaben²,

Breuil³

et al. 2009

J. Inst.

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“…The sealed single-wire detector was manufactured similarly to one filled with EF, however, its design was slightly changed. The problem is that TMAE absorbed on the cathode surface increases its quantum efficiency at least on one order of magnitude in a wide range of the spectrum, including a visible region [12]. For this reason, the detector has a collimator preventing the entering light to directly heat the cathode (see Fig.…”

Section: Tmaementioning

confidence: 99%

Systematic studies and optimization of super sensitivity gaseous detectors of sparks, open flames and smoke

Abbrescia,

De Cataldo,

di Mauro

et al. 2020

Preprint

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A review of the current progress in developments and tests of supersensitive gaseous detectors of open flame, sparks and smoke is given. A focus on the latest developments is on flat panel type sensors. This design, after further modification, will allow building not only a high efficiency detector but also offers UV imaging capability for flame visualization and several other applications. These studies were done in the framework of ATTRACT-SMART project.

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“…The QE was measured by a standard method, using a spectrograph similar to that described in refs. [25,26]. As light sources, either a Hg lamp or a H 2 one were used.…”

Section: Jinst 15 T12001mentioning

confidence: 99%

Evaluation of high sensitivity flat-panel gaseous detectors of flames, sparks and smoke

et al. 2020

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The early detection of dangerous events, such as large-scale fires, is critical to prevent the subsequent loss in term of human lives and damage to infrastructure. Here we report about the latest evaluation of the performance of solar blind flat-panel sensors developed by us, for the detection of flames, sparks and smoke. These developments will make it possible to build detectors almost 1000 times more sensitive than the best commercial flame sensor presently available on the market, with 100 times better time resolution, and with ultraviolet imaging capability for flame visualization.

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Liquid and solid organic photocathodes

Cited by 48 publications

References 19 publications

Progress in the development of a S-RETGEM-based detector for an early forest fire warning system

Progress in the development of a S-RETGEM-based detector for an early forest fire warning system

Systematic studies and optimization of super sensitivity gaseous detectors of sparks, open flames and smoke

Evaluation of high sensitivity flat-panel gaseous detectors of flames, sparks and smoke

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