Sensor is a device that responds to a physical, chemical, biological or electrical stimulus as an electrical output signal which is a function of input stimulus.
The device responds to the input stimulus by monitoring the change in oscillation frequency for acoustic waves.
INPUT SOURCES
The input stimulus could be physical such as changing pressure, temperature or stress. It also may be chemical such as particular gas concentration or the chemical agent. It also include biological input stimulus which include bacterial concentration, antibodies concentration. It also may be electrical which consists of strength of electrical or magnetic field or the change in conductivity of the materials.
The acoustic wave devices respond by changing its resonant frequency when transduction is given to the devices[1] by the input stimulus. Due to change in environmental factors such as change in temperature, pressure and stress the manufacturing of acoustic based products were very sensitive.
QUATRZ BULK ACOUSTIC WAVE
In BAW (Quartz Bulk Acoustic Wave), the resonant frequency get dramatically shifted due to the amount of metallization on its surface. This property is utilised for tuning the resonant frequency in a fine manner within the tolerance range. This process of tuning is called mass loading.
SURFACE ACOUSTIC WAVE
In this acoustic wave there is a delay line. If the deposition of the metal occurs in the delay path of this device, there will be increase in delay. When this device is combined with feedback amplifier to form an oscillator then surely there will be decrease in oscillation frequency.
ACOUSTI CS[2]
It is a branch of physics which deals with generation, propagation, reception and analysis of sound waves. The following are the imp...
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...ith a polymer Love waveguide coating is obtained.
POTENTIAL MARKETS AND APPLICATIONS
Major markets types of sensors
• Military 1.Chemical
• Automotive 2.Biological
• Industrial and environmental 3.Physical
• Food industry
• Medical
MILITARY APPLICATIONS
Chemical Agent Detectors
Blister- Mustard, Lewisite etc...
Blood- Hydrogen Cyanide, Cyanogen Chloride etc...
Choking/Lung- Chlorine, Cyanide etc...
Incapacitating- Canniboids, Phenothiazines etc...
Nerve- Sarin, Soman etc...
Bio-Agent Detectors
Anthrax, Botulism, Plague, Smallpox, Q-fever etc...
FUNDING AGENCIES
Army Research Laboratory (ARL)
Office of Naval Research (ONR)
Air Forest Research Laboratory (AFRL)
Department of Defence (DOD)
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