Abstract:
PURPOSE:To alleviate the phase delay in an output voltage, by attaching a buffer amplifier to the main body of a load cell with the amplifier made to approach a bridge circuit of strain resistors, and reducing distributed capacity, which is added to the load cell when a load is connected to the load cell. CONSTITUTION:A buffer amplifier 7 is made to approach to a bridge circuit 4 and attached to a metal body 1. The buffer amplifier 7 is connected to output terminals T1 and T2 and provided with resistors R5 and R6. An output voltage v'L is outputted from output terminals T1' and T2'. Owing to the presence of such a buffer amplifier 7, distributed capacity added to a load cell is small even though a load is connected across the output terminals T1' and T2'. Therefore, the phase delay in the output voltage can be made very small.
Abstract:
One or more strain sensors can be included in an electronic device. Each strain sensor includes a strain sensitive element and one or more strain signal lines connected directly to the strain sensitive element. The strain sensor(s) are used to detect a force that is applied to the electronic device, to a component in the electronic device, and/or to an input region or surface of the electronic device. A strain sensitive element is formed or processed to have a first gauge factor and the strain signal line(s) is formed or processed to have a different second gauge factor. Additionally or alternatively, a strain sensitive element is formed or processed to have a first conductance and the strain signal line(s) is formed or processed to have a different second conductance.
Abstract:
A device, method, and process for fabricating a sensor comprising a polymer-based microfluidic sensing platform for detecting distributed loads. The sensing platform comprises a polymer microstructure; and an electrolyte-enabled distributed transducer. The electrolyte-enabled distributed transducer comprises: a microchannel formed in the unitary polymer microstructure configured to hold an electrolyte; and an electrode underneath the microchannel. The microfluidic sensing platform is configured to detect distributed loads at the micron-millimeter scale.
Abstract:
A method of determining a parameter includes providing a sensor that provides a sensor analog voltage. The method also includes providing a peak detecting circuit for detecting a peak voltage in the sensor analog voltage. The method also includes providing the sensor analog voltage to the peak detecting circuit and detecting the peak voltage. The method also includes recording the peak voltage.
Abstract:
A method of determining a parameter includes providing a sensor that provides a sensor analog voltage. The method also includes providing a peak detecting circuit for detecting a peak voltage in the sensor analog voltage. The method also includes providing the sensor analog voltage to the peak detecting circuit and detecting the peak voltage. The method also includes recording the peak voltage.
Abstract:
A crank arm (200) includes a mechanical ring amplifier (232), having a cavity and a connecting bridge (140), to amplify the radial strain exerted on the crank arm by a rider. Strain sensors (234, 235) are positioned to detect the amplified radial strain. The crank arm (200) may include further strain sensors (228, 229) adapted to detect tangential strain on the crank arm, allowing both the tangential and radial forces exerted by a bicycle rider to be measured. The crank arm (200) may also comprise means for adjusting the position of a pedal axle relative to the crank arm, via the loosening, rotation and retightening of a carrier disc held by the crank arm, where the carrier disc has an eccentrically mounted aperture for holding the pedal axle.
Abstract:
The present invention provides a system (10) for measuring and remotely monitoring strain in an element 1 having a strain sensor (20), a telemetry circuit (40) for transmitting strain data to a remote location, and a reader module (60) for transmitting energy to the telemetry circuit and receiving said data.
Abstract:
MOSFETs (30, 40) are provided to connect the sensor input terminals (22, 24) of a ratiometric output sensor (20) to a pair of power terminals (12, 14), and the gate of each MOSFET is coupled to the opposite power terminal so that both MOSFETs are rendered conducting to power the sensor when a supply voltage of a predetermined polarity is connected across the power terminals but one of the MOSFETs (40) is rendered non-conducting when a voltage of the opposite polarity is so applied. The MOSFET that is rendered non-conducting is oriented so that any internal source-drain diode (48) does not bypass current around the MOSFET when voltage of the opposite polarity is applied. Optionally, over-voltage protection is provided by an input voltage sensor (64, 66) controlling the other MOSFET (30) through a third MOSFET (50).