Signal equation in signal-to-noise:
$$ s_{\text{target}} = s_{\text{constants}} \cdot s_{\text{sensor}} \cdot s_{\text{optic}} \cdot s_{\text{light}} $$
Where:
$s_{\text{target}}$ [electron]: Signal from the target.
$s_{\text{constants}}$ [J-1 m-1]: The factor of the signal calculation that involves Signal Constants.
$s_{\text{sensor}}$ [m2 electron s]: The factor of the signal calculation that relates to the specifications of the sensor, Signal Sensor.
$s_{\text{optic}}$ [%]: The factor of the signal calculation that relates to properties of the foreoptic and slit, Signal Optical.
$s_{\text{light}}$ [W sr-1 m-1]: The factor of the signal calculation that relies on the properties of the incoming light, Signal Incoming Light.
Derivation