Fluxgate sensors are precise vector sensors of magnetic fields (can measure both magnitude and direction). A fluxgate sensor uses a soft magnetic material (with a low coercive force/field and high permeability) as its core material and operates under magnetic saturation state. In saturation, the permeability of the core drops, causing the flux associated with the […]
Synchro has a single winding rotor that rotates inside a stator of three windings, much like an electric motor as shown in Figure 1. The primary winding wound around the rotor is excited by an alternating current, which induces currents to flow in three Y-connected secondary windings (oriented 120° apart). The relative magnitudes of secondary
LVDT is an inductive device. It has a primary coil, two secondary coils, and a linearly movable core. The primary coil is driven by an AC excitation current, which creates a varying magnetic field. This changing field induces an AC voltage or current in the secondary coil (usually two or three windings) that can be
Characteristics of Strain Gauges The core element of a piezoresistive sensor is the strain gauge. The characteristics of a strain gauge are mainly defined by the gauge dimensions, resistance, gauge factor, temperature coefficient, resistivity, and thermal stability. Gauge dimensions and shape are very important in choosing a right type of strain gauge for a given
When electromagnetic radiation, such as, infrared light, visible light, or ultraviolet (UV) light, strikes a photoconductive material, the resistance of the material decreases. This occurs because the electrons in the valence band of the photoconductive material are excited by the light and move to the conduction band, which increases the material’s conductivity. The amount of
An RCIM sensor is a sensor that results in a change in electrical resistance, capacitance, inductance, electrical field, or magnetic field when it is exposed to a physical, chemical, or biological stimulus. Its output could be a voltage, current, electrical charge, time, or frequency to reflect these changes. Following are the most important characteristics of
Encoders are non-contact, optical-based digital devices that are used for measuring displacement. They can be used to measure both linear and rotary displacement. We will concentrate on rotary-type encoders, which are widely used in motion-control applications. Rotary encoders are available as incremental or absolute type. An incremental encoder measures changes in rotation from some datum
An encoder is a sensor that converts rotational or linear displacement into digital signals. As shown in Figure 1, a typical optical encoder consists of: (1) light source (LED), (2) code disk, (3) stationary mask, (4) light detector (photodetector), and (5) signal conditioning circuit. The disk sits between the light source and the photodetector. As
Hi friends, In this article, I am discussing some important types of pressure transducer, pressure transducer working principle, advantages, disadvantages, and applications. So let us start. Pressure transducers are used to measure pressure. In a pressure transducer, firstly, the pressure is converted into a displacement by an elastic element like Bourdon tube, diaphragm, bellows, etc. And then
A data acquisition system (DAQ) is a computerized system that collects data from the real world, converts it into the form of electrical signals, and does required processing on it for storage, and presentation on computers. It acts as a bridge between the physical world and the digital realm. It captures physical quantities like temperature,