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Chapter 20: Problem 15

What are some of the major noise sources in piezoresistive and piezoelectric sensor systems?

Short Answer

Expert verified
In piezoresistive sensors, the major noise sources include thermal noise, shot noise, and 1/f noise. For piezoelectric sensors, the primary noise sources can be considered as thermal noise, mechanical noise, and dielectric noise.

Step by step solution

01

Introduction to Piezoresistive Sensors

Piezoresistive sensors are devices that exhibit a change in resistive value when subject to strain or force. They're commonly used in various applications such as pressure sensing, accelerometers, and touch sensing.
02

Noise Sources in Piezoresistive Sensors

The major sources of noise in Piezoresistive Sensors are: 1. Thermal noise: It is also known as Johnson-Nyquist noise. This noise is caused by the thermal agitation of the charge carriers in the sensor 2. Shot noise: This noise arises due to variation in the diffusion of charge carriers when an electric potential is applied. 3. 1/f noise: It is also known as flicker noise. The noise power spectral density is inversely proportional to the frequency.
03

Introduction to Piezoelectric Sensors

Piezoelectric sensors are devices that generate an electric charge in response to applied mechanical stress. They are extensively used in various applications such as in the detection and measurement of changes in pressure, acceleration, temperature, strain, or force.
04

Noise Sources in Piezoelectric Sensors

The significant sources of noise in Piezoelectric Sensors are: 1. Thermal noise: Just like in piezoresistive sensors, it is also a primary source of noise in piezoelectric sensors. It is the result of the thermal agitation of charge in the sensor. 2. Mechanical noise: This noise arises from the inherent mechanical vibrations of the material. 3. Dielectric noise. This noise is associated with the fluctuation in dielectric constants of the material used in the sensor.

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