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US 2022/0022768 A1Published application
Fluid monitoring device including impedance sensing element
Assignee3M Innovative Properties Company
InventorsMyungchan Kang, Jaewon Kim, Jung-Ju Suh, Chekhua Chua
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Abstract
Fluid monitoring devices (100,200,700) including an impedance sensing element (110,210,410,510,610,710,61,62,63) are provided. The impedance sensing element (110,210,410,510,610,710,61,62,63) includes a calibration portion (212, 412, 512, 612, 712) and a measurement portion (214,414,514,614,714), and the fluid monitoring devices (100,200,700) can be self-calibrated in real time based on calibration data from the calibration portion (212,412,512,612,712).
Claims20
A flexible sensor for fluid monitoring comprising:
- a flexible substrate having a first side and a second side opposite the first side;
- an impedance sensing element disposed on the first side of the flexible substrate;
- and
- a circuit unit functionally connected to the sensing element to receive data related to an impedance of the impedance sensing element from the impedance sensing element and process the data,
- wherein the impedance sensing element includes a calibration portion and a measurement portion electrically connected to the calibration portion, the calibration portion configured to generate calibration data, and the measurement portion configured to generate measurement data, and
- wherein the circuit unit is configured to calibrate the measurement data based on the calibration data.
3 more elements
A method of monitoring fluid, the method comprising:
- providing an impedance sensing element including a calibration portion and a measurement portion electrically connected to the calibration portion;
- disposing the impedance sensing element adjacent to a volume of fluid to be monitored;
- varying the fluid volume such that a fluid level thereof continuously runs across the calibration portion and the measurement portion of the sensor in sequence;
- and
- measuring an impedance-related property of the impedance sensing element when varying the fluid volume to obtain a plot of impedance-related property versus fluid level,
- wherein the plot has a calibration segment corresponding to the calibration portion of the sensor and a measurement segment corresponding to the measurement portion of the impedance sensing element, the calibration segment and the measurement segment are connected at a transitional point.
3 more elements
Dependencies are inferred from the claim text.