Apparatus for the continuous measurement of the density of a liquid by utilization of the law of refraction
Apparatus for measuring the density of a contained liquid, by utilizing the angular displacement of the limiting angle at total reflection
Refractive-index responsive light-signal system
Specific gravity transducer and battery performance indicator
Electrochromic thin film state-of-charge detector for on-the-cell application
Battery voltage tester for end of cell Patent #: 5494496
ApplicationNo. 121975 filed on 07/24/1998
US Classes:320/136, With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)324/427, To determine ampere-hour charge capacity356/135, Prism engaging specimen429/91For charge or liquid level
ExaminersPrimary: Wong, Peter S.
Assistant: Shin, K.
Attorney, Agent or Firm
International ClassesH02J 007/00
AbstractA method and apparatus for determining the instantaneous state-of-charge of a battery in which change in composition with discharge manifests itself as a change in optical absorption. In a lead-acid battery, the sensor comprises a fiber optic system with an absorption cell or, alternatively, an optical fiber woven into an absorbed-glass-mat battery. In a lithium-ion battery, the sensor comprises fiber optics for introducing light into the anode to monitor absorption when lithium ions are introduced.