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 Topic Title: Ultrasonic Sensor - Voltage Output Topic Summary: Voltage output calculation. Created On: 28 January 2011 12:22 PM Status: Read Only Linear : Threading : Single : Branch
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 28 January 2011 12:22 PM tmarcal Posts: 1 Joined: 28 January 2011 Hello. I need some help. I am trying to design a circuit to detect ultrasounds. I want to use the Knowles's sensor SPM0404UD5. To know the voltage output from the sensor, I use the following data: dB = 20log(M/1) (reference 0dB = 1V/Pa @ 1kHz); The typical sensor's sensitivity @ 1kHz is -42; The maximal sensitivity, in relation to 1kHz, is 12.5dB (35kHz to 55kHz region), but to do the calculation I used 15dB instead of 12.5dB. With these data, I calculated the voltage output of the sensor: M = 10^(dB/20) <=> M = 10^((-42+15)/20)=44.668mV/Pa 1psi = 6895Pa So, If there is, for example, a pressure of 100psi the voltage output is: V = 44.668*10^(-3)*100*6895 = 30799V. Am I correct? If not, what is the correct approach? I have no sure about these calculation because the final result gives me a very high output voltage. Thank you for help.
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