A strain gauge includes first and second substrates spaced apart from one another. A first flexible printed circuit board portion is in contact with a top side of the first and second substrates, and has a first Wheatstone bridge formed therein. The first flexible printed circuit board portion positions the first Wheatstone bridge such that two resistors of the first Wheatstone bridge are positioned to span from the top side of the first substrate to the top side of the second substrate. A second flexible printed circuit board portion is in contact with a bottom side of the first and second substrates, and has a second Wheatstone bridge formed therein. The second flexible printed circuit board positions the second Wheatstone bridge such that two resistors of the second Wheatstone bridge are positioned to span from the bottom side of the first substrate to the bottom side of the second substrate.

A container carrier connects to a filling machine with a gripper on one end that suspends a container during transport thereof along a transport direction. A deformation sensor arranged on a surface of the carrier detects the carrier's deformation when, as a container is filled, the weight of filling product deforms the carrier.

A stress sensor is provided, including a substrate and a bridge circuit disposed thereon. The bridge circuit is coupled between an output node and a ground node. The bridge circuit includes a first and second branch, the first branch having a first resistor coupled to a tunable resistor at a first intermediate node. The second branch has a second resistor coupled to a variable reference resistor of value Rref at a second intermediate node, wherein the variable reference resistor is configured to sweep through a plurality of discrete values Rref. The bridge circuit also includes an amplifier having a positive input terminal coupled to the first intermediate node and a negative input terminal coupled to the second intermediate node. The amplifier is configured to generate a digital voltage output at the output node as a function of the mechanical stress applied to the substrate and of the value Rref.

A pressure sensor and a packaging method thereof. The pressure sensor comprises: a sensitive chip, which comprises a thin-wall part and a supporting part connected to the periphery of the thin-wall part, the supporting part being provided with an electrode; a sealing element, which is fitted over the sensitive chip and partially surrounds together with the sensitive chip to form a sealing cavity, the sealing element being provided with a through hole corresponding to the electrode; a conductive component, which is provided in the through hole in a sealed mode and electrically connected to the electrode, the conductive component and the sealing element being arranged in an insulating mode, and the conductive component comprising a filling part and a leading-out part embedded in the filling part.

A strain gauge includes first and second substrates spaced apart from one another. A first flexible printed circuit board portion is in contact with a top side of the first and second substrates, and has a first Wheatstone bridge formed therein. The first flexible printed circuit board portion positions the first Wheatstone bridge such that two resistors of the first Wheatstone bridge are positioned to span from the top side of the first substrate to the top side of the second substrate. A second flexible printed circuit board portion is in contact with a bottom side of the first and second substrates, and has a second Wheatstone bridge formed therein. The second flexible printed circuit board positions the second Wheatstone bridge such that two resistors of the second Wheatstone bridge are positioned to span from the bottom side of the first substrate to the bottom side of the second substrate.

The present invention provides a pressure detection circuit including an oscillator unit, configured to output an oscillation signal as a count clock signal of a counter unit; and the counter unit, connected to the oscillator unit and configured to acquire a frequency of the oscillation signal and count. The pressure detection circuit further includes a comparator unit, connected to the counter unit, and configured to detect a voltage variation obtained by a pressure conversion, and send a signal to control the counter unit to count or stop counting; a voltage converter unit, connected to one input terminal of the comparator unit, and configured to supply a fixed or variable comparable voltage to the comparator unit; a constant current source charging unit, connected to the other input terminal of the comparator unit, and configured to supply a linearly and gradually increased comparison voltage to the comparator unit; a charge/discharge control unit, connected to the constant current source charging unit, and configured to control the constant current source charging unit to charge or discharge, such that the comparable voltage output by the voltage converter unit is compared to cause an output terminal of the comparator unit to enable counting of the counter unit; wherein the oscillator unit or the voltage converter unit further includes a pressure acquiring unit, as a component of the voltage converter unit or the oscillator unit, configured to convert a pressure into a variation of the comparable voltage or the frequency of the oscillation signal. The invention also provides a pressure input device pressure detection device. The invention has the technical effects of high sensitivity and resolution, power saving, and wide applicability.

A touch feedback and sensing device includes a circuit board, a piezoelectric ceramic actuator on the circuit board; and at least one strain sensor on the circuit board. The piezoelectric ceramic actuator includes a piezoelectric ceramic block, a cathode and an anode on the piezoelectric ceramic block. Different voltages are applied to the cathode and the anode to vibrate the piezoelectric ceramic block. The circuit board vibrates with vibration of the piezoelectric ceramic block. The at least one strain sensor is configured to detect and monitor vibration of the circuit board.

A sensor may include a bladder, and a deformable conductor disposed on the bladder such that deformation of the bladder causes deformation of the deformable conductor, wherein the bladder is constrained so as to enhance the deformation of the conductor in response to the deformation of the bladder. A method may include applying a stimulus to a bladder having a deformable conductor attached thereto, detecting a change in an electrical characteristic associated with the deformable conductor in response to the stimulus, and selectively constraining the bladder to amplify the change in electrical characteristic in response to the stimulus.

There is a strap tension detector for detecting tension in a strap. A housing has an upper portion and a lower portion. The upper portion and lower portion are adapted to receive the strap. A strain beam is mounted to one of the upper portion and the lower portion. The strain beam is arranged at an angle to the strap to extend across the width of the strap when the strap is placed between the upper portion and the lower portion and extending through the first and second strap-receiving openings so that the strap bears on the strain beam when taut. A strain gauge is operatively connected to detect strain across the strain beam.

In a Force/Torque sensor employing strain gages, a hardware temperature compensation procedure substantially eliminates thermal drift of a plurality of load-sensing strain gages with changes in temperature, using trimming resistors and a single, unstressed strain gage. The strain gages are connected in a quarter-bridge configuration, in multiple parallel stages. An unstressed strain gage in quarter-bridge configuration is connected in parallel. Trimming resistors are added across one or more of the unstressed and load-sensing strain gages in a compensation procedure that substantially eliminates thermal drift of the load-sensing strain gages over a predefined temperature range.