DEVICE FOR MEASURING CAPILLARY BLOOD CIRCULATION VELOCITY Russian patent published in 2004 - IPC

FIELD: medical engineering.

SUBSTANCE: device has two-beam interferometer having illumination unit having low coherence radiation source and objective, flat photodivider unit arranged at 45° to optical axis of the interferometer, flat parallel plane arranged in plane the object under measurement is located, flat reflector arranged along the beam reflected from the flat photodivider unit and belonging to a plane optically conjugated with illuminating body of the low coherence radiation source, the first photodetector arranged along the beam reflected from the flat reflector unit and passing through the flat photodivider unit and the second photodetector mounted in series along the optical axis. The second photodetector is arranged along the beam reflected from the object under measurement and passing through the flat photodivider unit. The photodetectors are arranged symmetrically relative to the flat photodivider unit. Their outputs are connected to subtraction circuit inputs. The subtraction circuit output is connected to band amplifier input and via it to power measurement unit. The illumination unit is deviated from optical axis by angle of α to be calculated from relation s/2=d tg α, where s is the linear illumination unit dimension to be measured in the direction set in perpendicular to radiation direction, d is the distance from the illumination unit to the flat parallel plate.

EFFECT: accelerated blood circulation velocity measurement.

2 dwg