BIOLOGY Meets Photonics
The EMI shielded room is also a light-tight chamber that becomes pitch dark. The PMT assembly has an opening with a vertical thread in the middle to help guide a person in placing his/her fingers in the correct position in front of the PMT window. When asked by the experimenter, the person opens a black sleeve, inserts his/her right arm into it, and positions his/her hand and fingers, enabling a vertical thread to lightly touch the distal joint of the middle finger. This person is then instructed to remain still for the duration of the measurement. The PMT assembly is configured to detect biophotons that emanate from the ventral side of a person’s right fingers.
The output of the PMT assembly is fed into the Counter/Analyzer via the connector feed in the shielded room. The Counter/ Analyzer communicates with the computer, which displays a frequency of incoming pulses every five seconds in the form of a real-time trend graph.