Hi my name is Matthew bizarro and I'm a research and development electrical engineer here at seabird scientific today I'm going to talk to you all about a very exciting new project we've been working on we're developing a solid-state pH sensor based on the same technology that goes into smart phones and computers this new method of measuring pH in the ocean offers many advantages over traditional methods such as glass bulb pH sensors or even having to take water samples this is a high level explanation of the ISFET the solid-state pH sensor used in the seabird scientific sea FET v2 C Fox b2 deep sea fox B to float pH and future solid state pH sensors many key concepts are out of scope for a short video but we will cover the main components that allow this device to measure pH with high accuracy and stability this is a simplified cross-section of the ISFET in a solution representing seawater this device can be broken down into a few distinct components first we have the ISFET dye itself this is a silicon chip like is used in a smartphone or a computer and actually functions as a transistor controlling the flow of electricity but instead of being turned on and off by an electric charge it's turned on and off by ions that pass through an ion selective membrane specifically hydrogen ions which determine the pH of a solution next we have the electronics that drive and control the ISFET these can be broken into two blocks the first represented by the op-amp on the Left keeps a constant current flowing through the ISFET and a constant voltage across it the second block represented by the op-amp on the right measures the voltage on the reference electrode this...
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