A detachable speed determining device includes an optical detecting module, an energy generating module and an energy storage module. The optical detecting module is adapted to determine axial rotational displacement of a bike component by detecting a movement of a pattern on the bike component. The energy generating module is adapted to generate energy. The energy storage module is sealed inside a housing of the detachable speed determining device in a water-resistance manner and electrically connected with the optical detecting module and the energy generating module. The optical detecting module is powered by the energy storage module, and the energy storage module is charged by the energy generating module. The detachable speed determining device further includes a bolted joint and a quick releasing handle, the bolted joint passes through an axle of the bike component, and the quick releasing handle is foldably disposed on the bolted joint.

A system for measuring a conveyor belt includes a first detector fixed at a location along a path of a conveyor belt. A first signal generator is affixed at a first location of the conveyor belt such that the first signal generator is detectable by the first detector when the first signal generator is in range of the first detector. The first detector is configured to provide a first signal as the first signal generator approaches the first detector. The first detector is configured to provide a second signal as the first signal generator moves away from the first detector. A processor is in electronic communication with the first detector and configured to calculate a belt speed based on an elapsed time between the first signal and the second signal.

Provided is an apparatus for measuring a droplet length using a capacitive electrode including: a disposable panel; a board separated from the disposable panel and configured to be reused separately from the disposable panel; a sensing electrode unit patterned on an upper surface of the board and configured to measure a length of a droplet depending on a voltage value measured depending on a capacitance value of the fluid passing through the microfluid channel; a thin film provided on a lower surface of the disposable panel; and a negative pressure forming means configured to apply a negative pressure between the disposable panel and the board so that the disposable panel and the board are attached to or detached from each other.

The present invention provides a device for detecting the position of a piston, which includes a magnetic substance and is arranged so as to be movable inside a cylinder, the piston position detection device comprising: a first sensor for detecting the position of the piston by sensing a magnetic field generated by the magnetic substance; a second sensor for preventing false detection of the first sensor by sensing, before the first sensor, an external magnetic field; and a housing, which is mounted on the outer circumferential surface of the cylinder and accommodates the first sensor and the second sensor therein.

In a method for determining the elongation of segments of a chain of a chain drive during operation, a plurality of measured values is determined at different positions of the chain. A plurality of length values is determined from the plurality of measured values and the length values are assigned to the segments of the chain, with the length of the segments of the chain being smaller than the length of the chain.

In a method for determining the elongation of segments of a chain of a chain drive during operation, a plurality of measured values is determined at different positions of the chain. A plurality of length values is determined from the plurality of measured values and a position of the segments of the chain is determined. The length values are assigned to the segments of the chain, with the length of the segments of the chain being smaller than the length of the chain.

A system and method for determining a change in a thickness and temperature of a surface of a material are disclosed herein. The system and the method are usable in a thermal protection system of a space vehicle, such as an aeroshell of a space vehicle. The system and method may incorporate micro electric sensors arranged in a ladder network and capacitor strip sensors. Corrosion or ablation causes a change in an electrical property of the sensors. An amount of or rate of the corrosion or the ablation and a temperature of the material is determined based on the change of the electrical property of the sensors.

A detachable speed determining device includes an optical detecting module, an energy generating module and an energy storage module. The optical detecting module is adapted to determine axial rotational displacement of a bike component by detecting a movement of a pattern on the bike component. The energy generating module is adapted to generate energy. The energy storage module is sealed inside a housing of the detachable speed determining device in a water-resistance manner and electrically connected with the optical detecting module and the energy generating module. The optical detecting module is powered by the energy storage module, and the energy storage module is charged by the energy generating module. The detachable speed determining device further includes a bolted joint and a quick releasing handle, the bolted joint passes through an axle of the bike component, and the quick releasing handle is foldably disposed on the bolted joint.

A detachable speed determining device includes an optical detecting module, an energy generating module and an energy storage module. The optical detecting module is adapted to determine axial rotational displacement of a bike component by detecting a movement of a pattern on the bike component. The energy generating module is adapted to generate energy. The energy storage module is sealed inside a housing of the detachable speed determining device in a water-resistance manner and electrically connected with the optical detecting module and the energy generating module. The optical detecting module is powered by the energy storage module, and the energy storage module is charged by the energy generating module. The detachable speed determining device further includes a bolted joint and a quick releasing handle, the bolted joint passes through an axle of the bike component, and the quick releasing handle is foldably disposed on the bolted joint.

The present disclosure discloses a sensing system for sensing a position of a gear shaft. The present disclosure may implement determination of whether the gear shaft is at a reverse gear position, a forward gear position or a neutral gear position by: partitioning a magnet into a first length region magnet and a second length region magnet, wherein the first length region magnet and the second length region magnet have different magnetic field directions, sensing and generating an inductive electrical signal reflecting motions of the first length region magnet and the second length region magnet; storing, by a memory unit, a first type reference signal for the first length region magnet and a second type reference signal for the second length region magnet, which are sensed by simulation; and comparing, by a processing unit, the inductive electric signal against the first type reference signal and the second type reference signal, which reflect different gear positions, respectively. By arranging only one magnet and one set of circuitry mechanical elements to sense a position of the gear shaft, the sensing apparatus according to the present disclosure effectively implements detection of the neutral gear position and the reverse gear position of the gear shaft, which reduces the manufacturing cost and lowers the failure rate.