In this paper, a simple and effective method was demonstrated for designing and optimizing the surface acoustic wave (SAW) force sensor with one-port resonators. Interestingly, via combining the empirical formula and the coupling of modes (COM), initial range of the essential structural parameters (i.e., the interdigital transducer pairs, the reflection grating pairs, the acoustic aperture and the film thickness) were confirmed. As such, the final parameters were obtained by using orthogonal tests and the analysis of comprehensive factors. Furthermore, the finite element simulations showed that our designed SAW force sensor exhibited a good negative linear relationship between the loads and the center frequencies. This study may provide an efficient and potential designing strategy for the practical SAW force sensors.
Optical window working under differential pressure condition could deform and deteriorate optical quality. Therefore, an optical window manufactured and measured under zero differential pressure would induce transmission wavefront aberration, when it works under differential pressure condition. A new processing technology requires the optical window to be manufactured and measured under a given differential pressure condition which is equal to the actual working differential pressure of the optical window. The loop of manufacturing and measuring goes on, until the final measuring result satisfies requirement. The completed optical window could repeat measuring result when it works at the same differential pressure condition.
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