diff --git a/pulseox.md b/pulseox.md index e91ef8ef01972d5c8de436efde843f05e87adcd3..a168e534183dae960df9d59df4350947a6ac3af9 100644 --- a/pulseox.md +++ b/pulseox.md @@ -27,6 +27,6 @@ A quick teardown of a ~$20 500BL from Walgreens revealed no integrated photonics ## Operational Theory Pulse oximetry is based on the [Beer-Lambert law](https://en.wikipedia.org/wiki/Beer%E2%80%93Lambert_law), a principle that relates the concentration of a species to the attenuation of light through a sample: ```math -I=Iin*e^-(D*C*E) +I=I_in*e^(-(D*C*\epsilon)) ``` -where _I_ is the intensity of light transmitted through the sample; _Iin_ is the intensity of the light prior to absorption by the sample; D is the optical path length; C is the solute concentration; and E is the extinction coefficient, the sample's absorption at a given wavelength of light. +where _I_ is the intensity of light transmitted through the sample; $`I_in`$ is the intensity of the light prior to absorption by the sample; _D_ is the optical path length; _C_ is the solute concentration; and $`\epsilon`$ is the extinction coefficient, the sample's absorption at a given wavelength of light.