Fig. Capacitive transducers (source: directindustry.com) Capacitive Transducers The capacitive transducer is the capacitor with variable capacitance. The capacitive transducer consists of two parallel metal plates that are separated by the dielectric material such as air. We are familiar with the equation of capacitor which is given as In a normal capacitor, the … Read more
Resistance box The box which contains the resistors which can cover a wide range of values for estimating and comparing the resistance is known as the resistance box. Features of Resistance box The accuracy of the resistance box is very high. The main application of the resistance box is to control the specific value of … Read more
A thermal conductivity gas analyzer is used to measure the chemical purity of a gas. The working of this type of analyzer is based on the difference in heat conductivity among gases. Fig. 1 shows the Basic thermal conductivity gas analyzer circuit. It is a Wheatstone bridge formed with two sensing resistors acting as balanced legs … Read more
The neutrons have the following property as they do not carry any charge. It is very difficult to detect neutrons. So, indirect methods are employed to detect neutrons. This consist of an arrangement where alpha or beta particles or gamma-rays are produced by colliding neutrons with a certain nuclear material. Indirect Method to detect Neutrons … Read more
A microphone is a transducer that converts sound into an electrical signal. In other words, a microphone is a special type of pressure transducer converting acoustic energy (pressure waves) into electrical energy. A microphone is nicknamed as mic or mike. The sensitive transducer element of a microphone is called its element or capsule. The sound is … Read more
In this article, we will learn about hygrometers and its types. Let’s begin with the definition of the hygrometer. Hygrometer A hygrometer is an instrument that measures the humidity directly. Now discuss some terms. Humidity It is the measure of water vapour present in a gas or environment. It is measured in relative, absolute humidity or … Read more
You have heard about proximity sensors in your daily life that are commonly used in mobile or smartphones, tablets, etc. Proximity sensors are commonly used on mobile devices to detect if someone is in nominal range. A proximity sensor is a type of sensor which is able to detect the presence of nearby objects without any … Read more
Figure. RVDT In the previous article, we have learned about Linear variable differential transformer (LVDT). Rotary Variable Differential Transformer (RVDT) is a variation of LVDT and used to sense angular displacement. It is a passive transducer. In short, RVDT provides a variable alternating current (AC) output voltage that is linearly proportional to the angular displacement … Read more
Dead Time It is defined as the time required by a measurement system to begin to respond to a change in the measurand. It is basically the time before the instrument begins to respond after the measurand has been changed. Dead Zone Dead zone is defined as the largest change of input quantity for which … Read more
The basic difference between Analog & Digital Instrument is given below. S.No. Aspects Analog Instrument Digital Instrument 1. Information form As the position of pointer on a dial/scale As a number 2. Possibility of human error Exists Does not exist 3. Best possible accuracy 0.25% +0.005% or greater 4. Resolution one in several hundreds one part in … Read more