Abstract
An optical fiber, which is widely known in optical networking, has a great and hidden potential for measurement. For example, an optical fiber probe is very useful and reliable in measuring bubble/droplet diameter and velocity. The single-tip optical fiber probe equipped with a micro groove processed by a femtosecond pulse laser is able to measure diameters and velocities of tiny droplets accurately. Furthermore, surface tension is easily measured by using the optical fiber probe equipped with a well-processed wedge shape sensing tip. The two-tip optical fiber probe equipped with a vapor deposit platinum layer measures droplet diameter, velocity and pH. In this paper, the author outlines these advanced optical fiber probes and their measurement principles.
