A Frequency Swept Low-Cost Capacitive Fringing Field PCB Sensor
| Autor: | Robert N. Dean |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Engineering
business.industry Instrumentation Capacitive sensing Frequency domain sensor 010401 analytical chemistry 01 natural sciences Capacitance Plot (graphics) 0104 chemical sciences Printed circuit board Proof of concept Automotive Engineering Electronic engineering business Electrical impedance |
| Zdroj: | International Symposium on Microelectronics. 2017:000157-000162 |
| ISSN: | 2380-4505 |
| Popis: | Reliable, low-cost sensors are important for many applications, including agriculture, pollution monitoring and weather forecasting. Commercial printed circuit board technology is being used to develop simple sensors for these applications, where the resistance or capacitance of the sensor is measured at a single frequency to determine useful information about an environmental parameter of interest. However, by measuring the complex impedance of the sensor over a wide frequency range, additional useful information can be obtained about the sensing environment. As a proof of principle, a suitable sensor was developed and evaluated in various aqueous solutions of interest using this technique. The measured sensor impedance was reduced to a capacitance versus frequency plot and a resistance versus frequency plot. Different aqueous solution chemistries resulted in characteristic signatures on these plots that could be useful in identifying the chemical compositions of the various solutions. Di-ionized water was used as a reference for chemical comparison. Various aqueous solution chemistries were then compared with DI water, resulting in corresponding signature differences of 10% to 50%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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