Biomimetic infrared sensors based on the infrared receptors of pyrophilous insects

Helmut Schmitz; Thilo Kahl; Helmut Soltner; Herbert Bousack

doi:10.1117/12.879149

23 March 2011 Biomimetic infrared sensors based on the infrared receptors of pyrophilous insects

Helmut Schmitz, Thilo Kahl, Helmut Soltner, Herbert Bousack

Proceedings Volume 7975, Bioinspiration, Biomimetics, and Bioreplication; 797506 (2011) https://doi.org/10.1117/12.879149
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Beetles of the genus Melanophila and certain flat bugs of the genus Aradus approach forest fires. For the detection of fires and of hot surfaces the pyrophilous species of both genera have developed infrared (IR) receptors, which have developed from common hair mechanoreceptors. Thus this type of insect IR receptor has been termed photomechanic and shows the following two special features: (i) the formation of a complex cuticular sphere consisting of an outer exocuticular shell as well as of a cavernous microfluidic core. (ii) The enclosure of the dendritic tip of a mechanosensitive neuron inside the core in a liquid-filled chamber. Most probably a photomechanic IR sensillum acts as a microfluidic converter of infrared radiation into an increase in internal pressure inside the sphere, which is measured by a mechanosensitive neuron. A simple model for this biological IR sensor is the Golay sensor, which is filled with a liquid instead of gas. Here the absorbed IR radiation results in a pressure increase of the liquid and the deflection of a thin membrane. For the evaluation of this model analytical formulas are presented, which permits the calculation of the pressure increase in the cavity, the deformation of the membrane and the time constant of an artificial leak to compensate ambient temperature changes. Some organic liquids with high thermal expansion coefficients may improve the deflection of the membrane compared to water.

Citation Download Citation

Helmut Schmitz, Thilo Kahl, Helmut Soltner, and Herbert Bousack "Biomimetic infrared sensors based on the infrared receptors of pyrophilous insects", Proc. SPIE 7975, Bioinspiration, Biomimetics, and Bioreplication, 797506 (23 March 2011); https://doi.org/10.1117/12.879149

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