Development and performance of solid Pb-PbCl2 non-polarized electrode
Abstract
Non-polarized electrodes are used to measure the potential differences between two points of ionic conductors. They have been widely used in geoelectric measurements,e.g., magnetotelluric (MT), induced polarization (IP), and spontaneous potential (SP). In practical applications, non-polarized electrodes have the following shortcomings: (1) Regular maintenance is required, and the electrodes must be placed in a special solution after use. (2)The working life is limited due to improper maintenance (3)The electrode is large and generally weighs more than 0.5kg. (4) The electrode temperature coefficient is usually 0.1~1mv/ which is required to be buried deep (>1m) for long-term observation. We have developed a maintenance-free solid Pb-PbCl2 non-polarized electrode. The electrode has the following advantages. (1) No maintenance is required, the bottom of the electrode is sealed with a rubber sheath. (2)The potential of electrodes is stable, with a monthly drift of less than 50 v. (3)The temperature coefficient is less than 10 v/degree. (4)The electrode is more portable, and the diameter is 2.5cm and 10cm in height, and the weight is 0.1 kg which can be also used in the lab; (5) The electrode is waterproof and can be used for the measurement of the electric field in waters, e.g., lake bottom. The field test shows that our electrode can significantly improve the data quality at dead-band and low-frequency for MT measurement, e.g., one can obtain smooth MT impedance with a period of more than 30,000 seconds for a month acquisition.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2021
- Bibcode:
- 2021AGUFMGP25A0391W