Ultrasonic through-wall sensors
Aspects of ultrasonic through-wall data communication are described. In some aspects, a sensor device is located in an isolated environment behind a wall. A modulator generates a modulated sensor signal based on the binary sensor signal and a carrier signal. A coaxially aligned pair of electroacoustic transducers that transmits the modulated sensor signal through the wall of the isolated environment. A demodulator demodulates the modulated sensor signal to generate a demodulated binary sensor signal. A sensor data recovery component converts the demodulated binary sensor signal into an image or another sensor parameter.
1. An ultrasonic through-wall sensor system, the system comprising:
a surface acoustic wave (SAW) sensor device within a contained environment, wherein the SAW sensor device within the contained environment is excited to generate a sensor output signal by a frequency sweep signal and without any additional power supply within the contained environment, and wherein components of the ultrasonic through-wall sensor system within the contained environment are limited to the SAW sensor device and at least one electroacoustic transducer;
a pair of electroacoustic transducers that transmits the sensor output signal from an inside of the contained environment to an outside of the contained environment, wherein the pair of electroacoustic transducers are coaxially aligned on opposite sides of a wall that isolates the contained environment; and
a sensor data recovery component that renders a user interface based on the sensor output signal.
2. The system of claim 1 , wherein the frequency sweep signal comprises an ultrasonic frequency.
3. The system of claim 1 , wherein the sensor data recovery component comprises a function analyzer.
4. The system of claim 1 , further comprising:
a function generator outside the contained environment that generates the frequency sweep signal.
5. The system of claim 1 , wherein the sensor data recovery component analyzes the sensor output signal in a time domain to identify a resonant frequency.
6. The system of claim 1 , wherein the sensor data recovery component analyzes the sensor output signal in a frequency domain to identify a resonant frequency.
7. The system of claim 1 , wherein the SAW sensor device identifies at least one of: humidity, viscosity, radiation, electromagnetic fields, chemical vapors, and biological matter.
8. An ultrasonic through-wall sensor system, the system comprising:
a resonant sensor device in an isolated environment behind a wall, wherein the resonant sensor device is excited by a frequency sweep signal to generate sensor data as a sensor output signal, and wherein the resonant sensor device is a surface acoustic wave (SAW) sensor device or a bulk acoustic wave (BAW) sensor device;
a coaxially aligned pair of electroacoustic transducers that transmits the sensor output signal through the wall of the isolated environment;
a demodulator that demodulates the sensor output signal to generate a demodulated sensor signal; and
a sensor data recovery component that converts the demodulated sensor signal into a recovered sensor parameter.
9. The ultrasonic through-wall sensor system of claim 8 , wherein the resonant sensor device comprises a radiation sensor device.
10. The ultrasonic through-wall sensor system of claim 8 , wherein the resonant sensor device resonates in response to the frequency sweep signal.
11. The ultrasonic through-wall sensor system of claim 8 , wherein the sensor data recovery component generates the recovered sensor parameter based on a sensor parameter table and a resonant frequency of the demodulated sensor signal.
12. The ultrasonic through-wall sensor system of claim 8 , wherein the frequency sweep signal is generated by a function generator outside the isolated environment.
13. The ultrasonic through-wall sensor system of claim 8 , wherein the frequency sweep signal comprises an ultrasonic carrier signal.
14. A method, comprising:
generating a sensor output signal using a resonant sensor device in an isolated environment behind a wall, wherein the resonant sensor device is excited to generate the sensor output signal by a frequency sweep signal, and wherein the resonant sensor device is a surface acoustic wave (SAW) sensor device or a bulk acoustic wave (BAW) sensor device;
communicating, by a coaxially aligned pair of electroacoustic transducers, the sensor output signal through the wall of the isolated environment;
demodulating, by a demodulator, the sensor output signal to output a demodulated sensor signal; and
converting, by a sensor data recovery component, the demodulated sensor signal into a recovered sensor parameter.
15. The method of claim 14 , further comprising:
generating, by a function generator, the frequency sweep signal, wherein the sensor output signal is generated by applying the frequency sweep signal to the resonant sensor device.
16. The method of claim 14 , wherein the resonant sensor device identifies at least one of: humidity, viscosity, radiation, electromagnetic fields, chemical vapors, and biological matter.
17. The method of claim 14 , further comprising:
applying an environmental control adjustment based on the recovered sensor parameter.
18. The method of claim 14 , further comprising:
generating a notification based on the recovered sensor parameter.
19. The method of claim 14 , wherein the sensor data recovery component converts the demodulated sensor signal into temperature reading.
20. The method of claim 14 , wherein the sensor data recovery component analyzes the sensor output signal in at least one of: a time domain or a frequency domain.