An acoustic sensor is a device that can monitor physical, biological, and chemical stimulus by producing as electrical signal through input stimulus. Furthermore, nearly all acoustic devices and sensors use a piezoelectric material to generate acoustic wave. The input stimulus can vary and could be physical such as a pressure and temperature. In chemical monitoring, percentage particulate gas concentration and addition of chemical agent are monitored through the use of acoustic sensors. Biological monitoring process includes, volume or concentration of bacteria, biological agent, and the concentration of antibodies. Electrical monitoring includes, strength of electric or magnetic field, conductivity, and resistivity.
Acoustic sensors are widely used in smart phones and base stations in the telecommunication industry. Under the acoustic sensor process, the acoustic wave travels through the surface of the material used. Thus, any change in propagation path would affect the velocity and amplitude of the acoustic wave. Velocity change can be monitored by checking the frequency and phase properties of the sensor used. Thus, it can be matched with the physical quantity being measured.
The acoustic sensors market can be segmented based on sensing parameters, type, and end-use industry. In terms of sensing parameters, the acoustic sensors market can be divided into - temperature, pressure, weight, humidity, viscosity, and torque. In terms of type, the acoustic sensors market can be segmented into - surface wave sensors (SWS) and bulk wave sensors (BWS). Based on end-users industry, the acoustic sensors market can be classified into– aerospace, consumer electronics, defense, automotive, healthcare, and industrial. Surface wave sensors are small electro-mechanical devices. These devices usually depends upon intonation of waves in order to sense any chemical, physical or biological phenomenon. The sensor converts an input signal into a mechanical wave which can be easily influenced by the physical phenomena. Bulk wave sensors (BWS) are used for bio-sensing applications and electrical change property in a solutions.
Surface acoustic wave (SAW) is used to create different varieties of sensors, which include chemical, strain, pressure, and temperature. These sensors can be configured accordingly and can be useful in aircraft/aerospace applications. The National Aeronautics and Space Administration (NASA) has been conducting several tests in wind tunnels, ground, and aircraft during take-off and in space. Several tests benefit from the reduction or removal of wires through the use of, SAW devices, which are treated as passive wireless sensors. Furthermore, SAW strain sensors are used for structural health monitoring and other aerospace applications. In aerospace, acoustic sensors are used to test vibration, resonance, aircraft structural properties, and frequency of operation, etc.
Acoustic sensors are used in the form of wearable sensors in the health care industry. These are used to track body movements, health, safety, treatment efficacy, home rehabilitation and early detection of disorders. Wearable sensors are used in diagnostic; as well as monitoring applications. These sensors provides accurate results and help to monitor as per the users concern. Acoustic sensors are used in portable devices such as laptops, smartphones, and other peripherals in the electronic industry. Smartphone sensors are employed in various applications in order to provide touch-free analysis of the user’s heart rate by analyzing the skin tone. Each heartbeat flushes blood, which rushes to the face. The light reflected from the skin tone is analyzed and measured by smartphone sensors. Thus, acoustic sensors are used in the consumer electronics industry as these provide information related to image sensors, temperature, pressure, proximity, motion, acoustic, and touch.
Manufacturers and suppliers operating in the acoustic sensors include Honeywell International, Kyocera, Panasonic Corp., Halliburton, Schlumberger, CTS Corporation, and Boston Piezo-Optics Inc.
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