Abstract: A system and method of measuring blood circulation velocity includes the steps of keeping a person measured by a blood oxygen saturation analytical instrument and served by a ventilator; setting an initial time point, providing a first gas to the person via the ventilator, and starting to record a blood oxygen saturation value per predict time interval; providing a second gas to the person at a first time point; providing a third gas to the person at a second time point; stopping recording the blood oxygen saturation value at a terminal time point; setting a reference time point according to the blood oxygen saturation value which has a variation according to the records; obtaining the person's blood circulation velocity, which is proportional to the reciprocal of the difference of the reference time point and the first time point.

Abstract: The present invention discloses a Bluetooth audio relay, which comprises: a printed circuit board (PCB); a Bluetooth chip mounted on the PCB for processing the Bluetooth signals and transforming the Bluetooth signals into digital audio signals; an antenna coupled to the Bluetooth chip for receiving and transmitting the Bluetooth signals, and transferring the Bluetooth signals to the Bluetooth chip; memory mounted on the PCB and coupled to the Bluetooth chip for storing digital data; a power supply coupled to the Bluetooth ship for providing power; a codec chip mounted on the PCB and coupled to the Bluetooth chip for transforming the digital audio signals into analog audio signals; and a plurality of audio jacks mounted on the PCB and coupled the codec chip for outputting the analog audio signals

Abstract: The present invention relates to a quadrangular-pyramid-shaped lensed fiber. One end of the fiber is ground to become quadrangular-pyramid-shaped. Small volume of the tip of the quadrangular-pyramid-shaped fiber is heated to form a semi-ellipsoidal microlens, thereby forming the quadrangular-pyramid-shaped lensed fiber. The advantage of the present invention is that the shape of the semi-ellipsoidal microlens can be controlled by adjusting the angles of the quadrangular-pyramid-shaped fiber according to the aspect ratio of the diode laser so as to enhance the coupling efficiency between an optical fiber and a diode laser.