A finger sensor is a device for monitoring medical values. It is placed on the finger, illuminates it and measures the light penetrating the finger via a sensor. Such a finger sensor consists of a light-emitting diode and a photodetector, which can be a photodiode or a phototransistor.
The fluoroscopy methods work with pulse wave analysis and can measure various medical parameters from the measurements, such as pulse rate and its changes. The measured values provide information about the cardiovascular system, transmission, which shows venous outflow, and augmentation, which are the reflexes of the pulse wave, which provides information about vascular stiffness.
If the light emitting diode produces light with different wavelengths, then the absorption curves can be used to determine the oxygen saturation in the blood.