An optical displacement gage is normally a fiber optic based device specifically designed to measure the displacement between two or more points on various surfaces. Displacement is one of the most important measurements that can be taken in any industry as it ensures that high quality is maintained in machinery and that precise, accurate, and fast production is upheld. Additionally, displacement gages can be used to measure characteristics like object thickness, height, and width. Many of these devices are designed for simple installation and have a variety of applications, such as monitoring the structural health of long-term structures like bridges, wind turbines, and railways.