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Custom Electronic Sensing Solutions | ![]() |
12 Stanley Street, Brighton, BN2 0GP Tel: +44(0)1273698749 tom@sensatech.com |
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Company Registration No. 10313103 |
Array Control Software Development Amplifier Design Electrical Impedance Tomography Remote Sensing Electric Field Sensing Look through/around Targets Technology |
Technology The principle of capacitive sensing is not a new one. The technique relies on the fact that any object in free space has an electrical capacitance to earth. The value of this capacitance depends on several factors, the principle ones being the object's surface area, the distance to earth and the permittivity of the intervening medium. The range and sensitivity of an instrument depends on the ability of the electronics to accurately measure extremely small values of capacitance. It is in this area that much of Sensatech's research has been focused, resulting in techniques which maximise noise rejection and minimise the unwanted effects of temperature. Sensatech has developed specific and unique skills focused around areas critical to the development and production of complex sensing solutions. Array control
Arrays of multiple sensor heads are multiplexed to allow Sensatech to
collect large sets of data and build images of a target object which
can then be analysed with proprietary embedded software. Because
through careful electrode design, parasitic capacitance remains very
small, Sensatech are able to measure down to 3 femto farad total
capacitance with 12 bit resolution and 3 atto farad accuracy. Such
small change is valuable for example in gap measurement. Software development
Data sets generated by sensor arrays can be large and complex. Some
arrays contain 2000 odd electrodes all of which are scanned and the
resulting data once processed provides knowledge of the target object. Amplifier design
Low noise with high input impedance and low capacitance guard
amplifiers have been built with excellent temperature stability. EIT Electrical impedance tomography Uses array generated data, then using back propagation techniques compares and reshapes the permeability characteristics of the space until it meets the data found by the sensor. This is the basis of X-RAY type tomography that Sensatech carry out using electric fields. While EIT is normally carried out with a transmitter and receiver plate in contact with the target object, using the techniques outlined above, Sensatech do not require to contact or invade the target object and can non invasively detect through other materials. Remote sensing Sensor Head can be 15m away from the amplifier and signal electronics. Basic types of electric field sensing
Look through/around Targets Technology Because Sensatech uses field sensing techniques as opposed to beam sensing techniques, our sensor can work effectively where others fail. |
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