The sound sensor functions as a microphone (microphone). It is used to receive sound waves and display vibrating images of sound, but it cannot measure the intensity of noise. The sensor has a built-in condenser electret microphone that is sensitive to sound. The sound wave vibrates the electret film in the microphone, which causes the change of the capacitance, and generates a small voltage corresponding to the change. This voltage is then converted into a voltage of 0-5V, received by the data collector after A/D conversion, and transmitted to the computer.
What are the types of sound sensors?
Acoustic sensors are now mainly divided into piezoelectric ceramics, capacitive, and moving coil types.
1. Piezoelectric ceramic sensor
The main working principle of the piezoelectric ceramic sensor is the positive piezoelectric effect. After the action of the external force, the charge generated can only be saved when the circuit has an infinite input impedance. In fact, this situation does not exist, so the piezoelectric Ceramic sensors can only be used to measure and sense dynamic or quasi-static stress. Mainly used for the measurement of various physical quantities such as acceleration, pressure and vibration and their changes. Piezoelectric ceramic sensors have become a key component of various control systems and detection instruments and have been widely used.
2. Capacitive sensor
Capacitive sensors use various types of capacitors as sensing elements to convert the measured physical quantity or mechanical quantity into a conversion device for changes in capacitance. In fact, it is a capacitor with variable parameters. Capacitive sensors are widely used in the measurement of displacement, angle, vibration, speed, pressure, component analysis, and medium characteristics. The most commonly used are parallel plate capacitors or cylindrical capacitors.
3. Magnetoelectric sensor
The magnetoelectric sensor uses the principle of electromagnetic induction to convert the input motion speed into the induced electric potential output in the coil. It directly converts the mechanical energy of the measured object into an electrical signal output, and does not require an external power supply to work. It is a typical active sensor. Due to the large output power of this sensor, the secondary meter circuit is greatly simplified.
Second, the application of sound sensors
1. Application in the military
Acoustic sensors have been widely used in ground sensor reconnaissance and surveillance systems, and their greatest advantage is strong resolution. If the moving target is a person, not only can the voice be heard directly, but also the nationality, identity and content of the conversation can be ascertained based on the voice; if the moving target is a vehicle, the type of vehicle can be judged based on the sound. For example, a device called "sound buoy" used by the US Army that can be hung on a tree has a detection range of 300 to 400 meters, which is close to the range of human hearing.
2. Application in medical treatment
Fiber-optic microphones have natural anti-interference ability against magnetic fields and can be used in MRI communications. It is the only microphone that can communicate between patients and doctors during MRI scans.
3. Application in life
1) Application on voice-activated switch
The use of voice-activated switches is a specific application of voice sensors in people's real life. As a part of electronic technology, the voice-activated switch incorporated in the sound sensor realizes the goals of automatic lighting of electric lamps, energy-saving and power-saving, and prolonging the service life of lamps. The voice control circuit does not need a special traditional switch. In the dark night, as long as someone passes through and makes a sound, the light will automatically light up, and when the person leaves, the light will automatically turn off. Voice-activated switches are widely used in public places such as stairs, corridors, office areas, guest houses, etc. Voice-activated switches have brought a lot of convenience to people's work and life, and their use has become more and more widespread.
In addition, the sound control circuit is an electronic device that controls the operation of the sound and light circuit. Therefore, it can convert sound and light into electrical signals to realize the control of various electrical equipment. Therefore, voice control circuits are widely used in many household appliances and industrial electrical equipment.
2) Application in the sound control sprinkler dust extinguisher
The operation of the voice-activated sprinkler dust extinguisher is very simple, as long as a person makes a sound and tells it to sprinkle water to extinguish dust, it can start to work. The voice-activated sprinkler dust extinguisher is actually activated by the solenoid valve through a voice-activated switch. Small sprinklers are used in many public places, such as squares, schools, hospitals, parks, etc.
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Industry InsightMarket Research Future (MRFR), highlights that the “Global Automotive Electronics Sensor Aftermarket Market 2020” is expected to grow exponentially, securing a significant market valuation and expected to reach USD 9,600 Million by the end of forecast period and a vigorous CAGR of 4.15% over the evaluation period of 2017-2025.
The report also refers to the influence of the novel COVID-19 pandemic on the market.Trending Factors & DriversAutomotive electronics sensor aftermarket market to experience a remarkable growth as automotive manufacturers is making their products energy-efficient, safer and convenient.
After this, rising production of cars globally, mounting vehicle electrification, stringent government regulations, and upward demand for automotive electronics sensor for the comfort and convenience has also motivated the market to a great extent.
More factors stated by the Market Research Future (MRFR) report include the rising concern about emission norms, greenhouse gas emissions and fuel economy getting stringent in various parts of the world, rigid rules laid down by the government for security and fuel emission have helped a great deal to shape the automotive industry amid COVID 19 outbreak.Top CompetitorsThe top players of global automotive electronics sensor aftermarket are listed as BorgWarner Inc. (US), NGK Spark Plug CO., LTD (Japan), Delphi Technologies (UK), Robert Bosch GmbH (Germany), Continental AG (Germany), Valeo (France), Hella GmbH & Co. KGaA (Germany), Denso Corporation (Japan), and Sensata Technologies, Inc. (US).Get Free Sample Report @ https://www.marketresearchfuture.com/sample_request/7708 Segmentation:In terms of type segment, the global automotive electronics sensor aftermarket has included a LiDAR sensor, oxygen sensor, position sensor, temperature sensor, speed sensor, pressure sensor, and others.In terms of application segment, the global automotive electronics sensor aftermarket has included body electronics, power train, telematics, safety & control, and others.In terms of vehicle type segment, the global automotive electronics sensor aftermarket has included light commercial vehicle, passenger car, and heavy commercial vehicle.Regional Analysis:Regionally, the global automotive electronics sensor aftermarket, has been studied for the regions of Asia-Pacific (APAC), Europe, North America, and the rest of the World.The Asia-Pacific market is highly expected to offer capable expansion opportunities for the automotive electronics sensor aftermarket with high automotive vehicle sale in India, China, New Zealand, Japan, Australia, South Korea, and Indonesia.
These regions grabbed 42.58 million units in 2017.
The automotive electric sensors are used in different systems of the electric vehicle, such as body electronics, power train & chassis, security and vehicle safety.
