For example, a mic in the telephone, mobile phone can convert the sound into electrical signals and then amplifies it into the preferred range.  Then, alters the electrical signals into audio signals at the o/p of the loudspeaker. Nowadays, fluorescent bulbs are used for lighting, changes the electrical energy into light energy.  examples of the transducer are mic, fluorescent bulb and speaker. 

There are different type of transducer like pressure transducer, piezoelectric transducer  and ultrasonic transducer and temperature transducer. Different types of transducer have different applications in real life. Some transducer types like active transducer and passive transducers are based on whether a power source is required or not. Active transducer does not require any power source for their operation. It works on the principle of  energy conversion. Example of active transducer is thermocouple. Passive transducer require an external power to operate. Example of passive transducer is a photocell.

Piezoelectric transducer is a sensor which is used to convert mechanical energy into electrical energy. In the same way, electrical energy can be transformed into mechanical energy. This transducer is mainly used to detect the sticks drummer impact in electronic drum pads. And also used to detect the movement of the muscle, which can be named as acceleromyography.  The load of the engine can be determined by calculating diverse absolute pressure, that can be done by using these transducers as the MAP sensor in fuel injection systems. This sensor can be used as knock sensor in automotive engine management systems for noticing knock of the engine.

Pressure transducer is a transducer that converts pressure into an analog electrical signal by performing physical deformation of strain gages which are bonded into the diaphragm of the pressure transducer and wired into a wheatstone bridge configuration. This transducer is mainly used to measure the pressure of the specific quantity like gas or liquid by changing the pressure into electrical energy. This transducer can be used in altitude sensing, pressure sensing, level or depth sensing, flow sensing and leak testing.

Temperature transducer is an electrical device that is used to convert the temperature of a device into another quantity like electrical energy or pressure or mechanical energy, then the quantity will be sent to the control device for controlling the temperature of the device. Temperature transducer is used to measure the temperature of the air such that to control the temperature of several control systems like air-conditioning, heating, ventilation, and so on.

The main function of the ultrasound transducer is to convert electrical signals to ultrasound waves. This transducer can also be called as capacitive or piezoelectric transducers. This transducer can be used to measure the distance of the sound based on reflection. This measurement is based on a suitable method compared to the straight methods which use different measuring scales. The areas which are hard to find, such as pressure areas, very high temperature, using conventional methods the measurement of the distance is not a simple task. So, this transducer based measuring system can be used in this kind of zone.

A transducer is a device that transforms a signal from one energy form to another energy form. One example is a speaker, which converts an amplifier's electrical energy into sound waves or mechanical energy. Energy forms consist of (but are not confined to) mechanical, electrical, chemical, electromagnetic, thermal and acoustic energy. 

Even though the term transducer normally indicates the use of a sensor/detector, any device that transforms energy can be considered a transducer. A transducer is commonly used in measuring devices.

Application of transducer in daily life:

Pressure transducer is used to measure the pressure of the specific quantity like gas or liquid by changing the pressure into electrical energy. The different kinds of these transducers like an amplified voltage transducer, strain-gage base pressure transducer, millivolt (mv) pressure transducer, 4-20mA pressure transducer and pressure transducer.

 

The applications of pressure transducer mainly involve in altitude sensing, pressure sensing, level or depth sensing, flow sensing and leak testing. These transducers can be used for generating an electrical power under the speed breakers on the highways or roads where the force of the vehicles can be converted into electrical energy.

Temperature transducer is used to measure the temperature of the air such that to control the temperature of several control systems like air-conditioning, heating, ventilation, and so on.

A transducer is any device that converts one form of energy into a readable signal. Many transducers have an input that is then converted to a proportional electrical signal. Common inputs include energy, torque, light, force, position, acceleration, and other physical properties. The output obtained from transducers is always in the electrical form, which is proportional to the measured quantity applied to the device. 

Below is an example: 

 

A load cell will convert an applied force to an electrical potential that is equivalent. The force is measured with strain gauges in a Wheatstone bridge configuration. The strain gauges measure electrical resistance changes in response to an applied force. The signal from the strain gauge passes through signal conditioning, or amplification, before being output as an electrical signal to a form of Data Acquisition. 

 

APPLICATION OF TRANSDUCER 

Electromagnetic: 

1.       Antenna: Converts electromagnetic waves into electric current and vice versa. 

2.       Cathode ray tube: It converts electrical signals into visual form. 

3.       Fluorescent lamp, light bulb: It converts electrical power into visible light. 

4.       Tape head: It converts changing magnetic fields into electrical form. 

5.       Hall effect sensor: It converts a magnetic field level into electrical form only. 

Electromechanical: 

Electromechanical output devices are generally called actuators. Examples are: 

1.       Galvanometer 

2.       Rotary motor, linear motor 

3.       Vibration power generator 

4.       Potentiometer when used for measuring position 

5.       Load cell converts force to mV/V electrical signal using strain gauge. 

Electro acoustic: 

1.       Loudspeaker, earphone: It converts electrical signals into sound. 

2.       Microphone: It converts sound into an electrical signal. 

3.       Piezoelectric crystal: It converts solid state electric modulations into an electrical signal. 

4.       Hydrophone: It converts changes in water pressure into an electrical form. 

1.     Can effectively translate the ratio between the largest amplitude signal and the lowest amplitude signal.

2.     Produce an identical output when stimulated by the same input.

3.     Adds random noise to their output to corrupt small signals more than large signals.

4.     Hysteresis

·       Half effect sensors (converts a magnetic field level into an electrical signal)

·       Hydrogen sensors

·       Galvanometers

·       Loud speaker, earphones

 

A transducer is a device that transforms a signal from one energy form to another energy form. One example is a speaker, which converts an amplifier's electrical energy into sound waves or mechanical energy. Energy forms consist of (but are not confined to) mechanical, electrical, chemical, electromagnetic, thermal and acoustic energy. 

Even though the term transducer normally indicates the use of a sensor/detector, any device that transforms energy can be considered a transducer. A transducer is commonly used in measuring devices.

Application of transducer in daily life
Application of Pressure Transducer

Pressure transducer is used to measure the pressure of the specific quantity like gas or liquid by changing the pressure into electrical energy. The different kinds of these transducers like an amplified voltage transducer, strain-gage base pressure transducer, millivolt (mv) pressure transducer, 4-20mA pressure transducer and pressure transducer.

 

The applications of pressure transducer mainly involve in altitude sensing, pressure sensing, level or depth sensing, flow sensing and leak testing. These transducers can be used for generating an electrical power under the speed breakers on the highways or roads where the force of the vehicles can be converted into electrical energy.

Temperature transducer is used to measure the temperature of the air such that to control the temperature of several control systems like air-conditioning, heating, ventilation, and so on.

A transducer is a device which transforms non-electrical energy into electrical energy or vice versa. Another definition of this term transducer is a device which transforms energy from one domain into another. Typical energy domains are mechanical, electrical, chemical, fluid, and thermal. A transducer can be defined also as a device which transforms energy from one type to another, even if both energy types are in the same domain. 

According to the above definitions, transducer is a device that converts a signal from one physical form to a corresponding signal having a different physical form. Therefore it is an energy converter. This means that the input signal always has energy or power. 

Transducers may generally be divided into two class – Sensors, which monitor the system – Actuators, which impose a condition on a system. Sensors and actuators are comprehensive classes of transducers. Some transducers can operate as a sensor or as a actuator, but not as both simultaneously. 

Sensor examples: 

 – Hotwire anemometers (measure flow velocity) 

– Microphones (measure fluid pressure) 

– Accelerometers (measure the acceleration of a structure) 

– Gas sensors (measure concentration of specific gas or gases) 

– Humidity sensor 

– Temperature sensors, etc Actuator examples 

– Motors (which impose a torque) 

– Force heads (which impose a force) 

– Pumps (which impose either a pressure or a fluid velocity). 

Any device converting signal of one kind to signal of a different kind is considered to be a transducer. The output signals can be of any useful physical form. The transducer can be placed as input transducer or output transducer. An input transducer converts physical signal to electric signal while an output transducer converts electric signal to physical signal. 

Another name of input and output transducers are sensor and actuator. Sensor is used to refer to the input transducer while actuator refers to the output transducer. Sensors are intended to acquire information, usually designed to handle low power and intended to consume energy as low as possible. Actuators are designed to power conversion and to handle (relatively) high power.