Device for measuring pressure, variation in acoustic pressure, a magnetic field, acceleration, vibration, or the composition of a gas
A gas composition, magnetic field technology, applied in the fields of acceleration, vibration or gas composition, magnetic field, pressure measurement, sound pressure change, and can solve problems such as diaphragm adhesion, complex structure, movement, etc.
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[0025] Figure 1a with Figure 1b A schematic construction of an ultrasonic sensor 1 according to the invention is shown. exist Figure 1a A configuration in which the ultrasonic transmitter 2 is formed by a single cavity is shown in and in Figure 1b The case of sound formation using several parallel oscillating emitters 2 is shown in . The diaphragm 9 of the transmitter 2 creates a resonant ultrasound in the cavity 4 above it. The ultrasound transmitter 2 generates electrical series and parallel resonances. The impedance of a series resonance is typically 1 to 10 kΩ and that of a parallel resonance is 10 to 100 times greater, always according to the quality factor of the resonator. It can be assumed that the flexible upper diaphragm 3 will reflect most of the sound back and only a small part will radiate out behind the diaphragm 3 . In practice, this means that the impedance of the series resonance is reduced. If the diaphragm radiates power outwards, the quality factor...
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