In this article, learn about fluid measurements with medical uses as well as the versatility of impedance measurements.
Historically, single-read measurements of various bodily fluids were taken to help evaluate a patient’s health. As technology has advanced recently though, it has become a possibility to perform continuous analysis of these things using impedance measurements. Simply put, impedance is a measurement of the amount of resistance presented by a circuit to a voltage change. In medical applications, impedance measurements of various bodily fluids can highlight irregularities that should be investigated further.
There many types of impedance measurements available for use with fluids:
● Potentiostat. Measures and controls the voltage between a working electrode (WE) and a reference electrode (RE).
● Amperometric. Applies a bias voltage to the sensor and measures the response current.
● Cyclic Voltammetry. Measures function electrochemically, whereby the potential of an electrochemical cell is slowly increased and then linearly decreased
● Conductivity Measurement. Based on the determination of ohmic resistance between two electrodes placed in a liquid.
● pH Measurement. Based on the principle of a half-cell reaction and dependant on the H+ ion concentration, this method measures the resultant voltage which has a linear relationship with the pH value.
● Electrochemical Impedance Analysis. Measures the impedance of an electrochemical cell or sensor across an entire series of different frequencies. Important because it self-analyzes and self-corrects over time.
It can be tough to find a device that can be configured to take all of these measurements, but Analog Devices has done just that with the ADuCM355. With an ARM® Cortex®-M3 processor and a 16-bit, 400 kSPS multichannel, SAR ADC with input buffers, this device provides the accuracy, versatility, and dependability needed for current and future liquid measurement needs. Click through to the article for more information.
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