Methods and system for obtaining a force measurement with reduced drift effects
AssigneeGeneral Electric Company
InventorMohammad Mohammad Khair
Life of this patent
Estimating the term…
Abstract
Various methods and systems are provided for a drift-compensated force measurement. In one example, a method includes obtaining a single output voltage measurement from a strain gauge of an infant scale, the single output voltage reflective of a weight applied to the scale; obtaining a voltage measurement across each of four resistors of the strain gauge to determine four separate voltage measurements and determining a drift voltage based on the four separate voltage measurements; and outputting a corrected weight value determined based on a difference between the single output voltage and the drift voltage
Claims20
A method, comprising:
- obtaining a single output voltage measurement from a strain gauge of a scale, the single output voltage reflective of a weight applied to the scale;
- obtaining a voltage measurement across each of four resistors of the strain gauge to determine four separate voltage measurements and determining a drift voltage based on the four separate voltage measurements;
- and
- outputting a corrected weight value determined based on a difference between the single output voltage and the drift voltage.
A method, comprising:
- obtaining a force measurement from a strain gauge including a wheatstone bridge;
- receiving individual voltage measurements across each of four resistors of the wheatstone bridge;
- determining a drift term based on a sum of the individual voltage measurements for the four resistors;
- and
- outputting to a display a corrected force measurement, the corrected force measurement obtained by subtracting the determined drift term from the received force measurement.
A system for continuously measuring a weight of an infant, comprising:
- a display;
- and
- a control unit communicatively coupled to the display and including instructions stored in memory executable by a processor of the control unit to:
- acquire an output voltage from a strain gauge of a scale, the strain gauge including a wheatstone bridge with four resistors, the output voltage indicative of a change in force applied to the scale;
- acquire four individual voltages, each of the four individual voltages acquired across a different one of the four resistors;
- determine a drift voltage from the acquired four individual voltages;
- determine a drift-compensated weight value based on a difference between the acquired output voltage and the determined drift voltage;
- and
- displaying the determined drift-compensated weight value via the display.
Dependencies are inferred from the claim text.