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add diagram for capacitive fingerpint sensors

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@ -41,6 +41,11 @@ Optical sensors can also struggle in the presence of bright sunlight, which is a
Capacitive sensors measure the electrical conductivity of your finger. These are much more secure than optical sensors since they can't be fooled with an image. They're also tough to fool with prosthetics as different materials will have different electical properties.
<figure markdown>
![Diagram showing a closeup of how a capacitive fingerprint sensor works by detecting the electrical difference in the ridges and valleys of a finger](../assets/images/biometrics-explained/capacitve-diagram.jpeg)
<figcaption>source: <a href="https://www.bayometric.com/capacitive-vs-optical/">bayometric.com</a></figcaption>
</figure>
Capacitive sensors won't work if the [tissue is dead](https://www.livescience.com/62393-dead-fingerprint-unlock-phone.html), since dead tissue loses all electical charge. So morbid worries about someone using your dead body to unlock your phone can be assuaged.
Conveniently they also don't require a light source under them to work, although they will struggle in the presence of moisture.