Biomedical Absorbance Measurements
Similar to the work of being an EKG Technician, having an EKG Technician job or even attending to an EKG Technician training, the simplest type of optical measurement is the determination of the absorbance. Light of a certain frequency travels a defined distance through the analyte. By detecting the fraction of transmitted light the extinction coefficient of the analyte for the frequency can be determined. The extinction dependence of the frequency yields information about the chemical composition of the analyte.
For the extinction to be sufficiently high for detection, the light traveling distance through the analyte has to be long enough. This can cause a problem, in particular if the analyte is a gas, where the distance can be more than 100 m. In this case, one could incorporate a photonic cavity into the sensing region which causes the light to be reflected back and forth multiple times, resulting in a much longer efficient traveling distance. The light incident on the cavity has to be coherent, which means that a laser source is required. Additionally, the cavity has to be tuned according to the wavelength of the laser source.
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