2-D Tilt Sensor Based on Coaxial Cable Fabry–Perot Resonators With Submicroradian Resolution

Inclination Sensor With a Wide Angle Measurement Range Using Half-Wavelength Microstrip Resonator

“…The resolution of our inclinometer is close to the optical FBG based inclinometers presented in [13] and [10], but it has a higher sensitivity to the inclination variation and can measure a wider range of tilt angles. In [3], [5], [7], inclinometers that use optical, hollow coaxial cable, and transmission line Fabry-Perot techniques are described to have excellent resolution, but they have an extremely limited angle measurement range. No exact resolution data is given for the capacitive inclination sensor presented in [9], but our sensor outperforms it in terms of sensitivity and dynamic range.…”

“…An inclination sensor can be mounted on an infrastructure being built or on the moving parts of a robot and the inclination of that part can be monitored or controlled using a processing wireless network connected to the sensor. Dierent types of inclinometers have been reported using electric contact [8], micro-electro-mechanical method [1], electrolytes [2], capacitance method [9], transmission line resonators [3], [4], [7], and ber optics [5], [6], [10] [14]. Most of the ber-optic (FO) inclinometers fall into one of two types: Extrinsic Fabry-Perot Interferometers (EFPI) or Fiber-Bragg-Grating (FBG) sensors.…”

“…In FBG-based inclinometers, the shift in tilt angle causes a variation in strain applied to the FBGs, which in turn shifts the resonance wavelength [6], [10] [13]. Fiberoptic inclinometers typically have low transmission loss, high accuracy and high sensitivity but they are not always an option when the application involves harsh environments where robust construction and durability are also required, as well as having a costly interrogation system [3], [4], [7].…”

“…Coaxial cables oer higher durability compared to optical bers, making them a promising candidate to implement inclinometers. In [3] and [7], coaxial cable inclinometers mimicking optic-ber EFPIs have been explored. In [3], a metal mass block, suspended in proximity to the open end of a hollow coaxial cable in parallel, is used to make a pendulum structure.…”

“…In [3] and [7], coaxial cable inclinometers mimicking optic-ber EFPIs have been explored. In [3], a metal mass block, suspended in proximity to the open end of a hollow coaxial cable in parallel, is used to make a pendulum structure. Applying inclination to the pendulum leads to modication in the phase reection coecient at the open end.…”