Photoelectronic device for measuring of small rotary angles in thromboelastography applications

Thromboelastography device (TEG) is an instrument which measures the dynamic changes of whole blood from the process of clotting to fibrinolysis. This measurement can be achieved by measuring the small rotary angle, which is one of the key techniques used in TEG. On the principle of optical lever, a photoelectronic device for measuring small rotary angles was developed in this article by using position sensitive device (PSD) as its primary element. The weak photoelectronic signals produced by the PSD are magnified using an I/V converter and differential amplifier unit before being filtered and denoised by wavelet sym3. Liquids of varying viscosity were later experimented on the device and have, on a preliminary basis, validated the feasibility of the device.