Category | Sensors

Closed loop sensor with flux-gate technology

Posted on 15 January 2014

  Flux gate sensor The flux gate principle is familiar from the flux-gate magnetometers. These were developed during the second world war and used by low flying aircraft to detect submarines. These days fluxgate sensors are used in gyro compasses and in lab equipment to measure remanent magnetism for example. The flux-gate magnetometer can measure [...]

Angular Position Sensors (Shaft Angle Transducer)

Posted on 09 December 2013

  Almost every machine or industrial process contains one or more rotating shafts. It is therefore important in most instrumentation systems or control systems to be able to measure the exact shaft angle of a mechanical shaft. This angular data can be used to control position, speed or acceleration of a mechanism. Standard shaft angle [...]

Hall Effect Sensors

Posted on 17 September 2013

  Hall effect If we place a current carrying conductor or semiconductor in a perpendicular magnetic field B (fig. 1) then an electric field arises perpendicular to the I-B surface. This effect is known as the Hall-effect. This effect was discovered in 1879 by the American physicist Edwin Herbert Hall. Figure 1. Hall effect Consider [...]

Opto-electronics

Posted on 04 September 2013

  LED (Light Emitting Diode) The light emitting diode (LED) has been used for years as a signal lamp, as number indicator and as a light emitting transmitter in an opto-coupler. In recent years the LED is becoming ever more popular as a light source. The operating principle of the LED rests on the release [...]

Air-core Transducer Technologies

Posted on 23 November 2012

              The performance of current and voltage transducers are often limited by the characteristics of the magnetic core material itself (e.g. remanence, hysteresis, non-linearity, losses, saturation), so the design of an air-core, or coreless, transducer is often considered. In this case the following issues have to be taken into [...]

Transducers Based on Fluxgate Technologies

Posted on 12 November 2012

              Most current transducer technologies can be modified into a voltage transducer by ensuring the small measurement current (proportional to primary voltage) is applied to a large number of primary turns to create the Ampere-turns necessary for measurement. This is commonly accomplished with Fluxgate technologies, but less typically with [...]

Eta Technology Hall Effect Current Transducers

Posted on 20 September 2012

              Eta is the name of the Greek symbol ‘η‘, representing efficiency. The Eta transducer product family has been given this name because of its very low secondary power requirements while also providing exceptional performance. In terms of performance, Eta falls between open loop and closed loop technologies. Because [...]

Closed Loop Hall Effect Voltage Transducers

Posted on 31 May 2012

              The article "Characteristics of Closed Loop Current Transducers" describes the measurement of current with galvanic isolation, but it is also possible to measure a primary voltage with galvanic isolation using the same technology. Such voltage transducers are based on sensitive and accurate current measurement technologies, such as closed [...]

Concerns When Using Transducer Measurement Devices

Posted on 24 May 2012

              Below are some concerns that one should be aware of when using transducer based measurement devices. Power supply polarity inversion A transducer may be damaged by an inversion of the power supply voltage or connection of supply voltages to the output or common pins. If this is a [...]

Selecting Voltage Transducers

Posted on 18 May 2012

              The selection criteria for a current transducer (see "Selecting Current Transducers") are also applicable to voltage transducers, especially when the voltage measurement is based on a "current measurement principle". The main difference lies in the primary parameters which affect the link between the voltage to be measured and [...]