Shape Optimization Of Photoacoustic Resonators
Author(s)
B. Kost, B. Baumann, M. Germer & M. Wolff
Abstract
The sensitivity of photoacoustic sensors strongly depends on the shape of the
acoustical resonator.Up to now, mainly photoacoustic sensors consisting of a number
of cylindrical parts have been investigated (cylinder cells, H cells, T cells etc.).
In this paper, a numerical shape optimization of the resonator cell of photoacoustic
sensors is described. The approach considers all shapes that can be represented
by a number of axisymmetrical truncated cones which are connected in a continuous
way. In addition, the geometry of the cell is subjected to certain constraints,
e.g. the laser beam should not be blocked during its passage through the cell. The
purpose is to maximize the sensor’s signal strength. The acoustic pressure at the
microphone of the sensor represents the objective function and is calculated using
an eigenmode expansion combined with a finite element calculation. The solution
of the 9-dimensional nonlinear optimization problem is a resonator shape with a
substantial quality improvement with reference to the well-known H cell.
Keywords: photoacoustic, gas sensor, acoustic resonator, shape optimization.
Keywords
photoacoustic, gas sensor, acoustic resonator, shape optimization.
Related Book
Other papers in this volume
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