A tilt sensor includes a notification unit adapted to provide notification about occurrence of tilt; a water storage chamber that contains an electrolytic solution; and a unit cell that includes a positive electrode, a negative electrode, and a separator placed between the positive electrode and the negative electrode. When the water storage chamber tilts, the electrolytic solution is injected into the separator and the unit cell starts generating power and supplies electric power needed to drive the notification unit.

A tilt sensor includes a notification unit adapted to provide notification about occurrence of tilt; a water storage chamber that contains an electrolytic solution; and a unit cell that includes a positive electrode, a negative electrode, and a separator placed between the positive electrode and the negative electrode. When the water storage chamber tilts, the electrolytic solution is injected into the separator and the unit cell starts generating power and supplies electric power needed to drive the notification unit.

The optical fiber sensing method of the present invention includes steps of: joining heat shrinkable tubes to two ends of a sensing segment of an optical fiber; coupling a fixing element on the heat shrinkable tube below the sensing segment; detachably connecting at least one floating element to the fixing element; placing the floating element into a fluid; and providing an input signal to the sensing segment and generating an output signal after the input signal is processed by the sensing segment, wherein the tensile force applied to the sensing segment would change with variation of the buoyant force upon the floating element, resulting in change of the output signal. Accordingly, the optical fiber sensing method has numerous advantages, including rapid on-site construction, recyclability of components and changeability of design parameters.

The objective of the invention is to improve the durability and reduce the weight of a device for measuring the difference between the drafts on the two sides of ship, by making it possible to prevent the occurrence of bubbles in a measuring liquid and prevent leakage of the measuring liquid. In order to measure the difference between the drafts on the two sides of a ship, a measuring device (1) is provided with: two liquid level measuring tubes (11) attached respectively to the port and starboard sides of the ship; a communicating hose (41) which causes the two liquid level measuring tubes (11) to communicate with one another; and a drum (51) to which a central portion of the communicating hose (41) is secured, and onto which a left hose section (41a) and a right hose section (41b) are wound simultaneously. In order to bend the central portion of the communicating hose (41) into a U-shape to catch said central portion, the measuring device (1) includes a hose catching projection (51c) which protrudes from an outer peripheral surface of a shaft member (51a) of the drum (51), and a resin coil spring (42) mounted on the central portion of the communicating hose (41).

The objective of the invention is to improve the durability and reduce the weight of a device for measuring the difference between the drafts on the two sides of ship, by making it possible to prevent the occurrence of bubbles in a measuring liquid and prevent leakage of the measuring liquid. In order to measure the difference between the drafts on the two sides of a ship, a measuring device (1) is provided with: two liquid level measuring tubes (11) attached respectively to the port and starboard sides of the ship; a communicating hose (41) which causes the two liquid level measuring tubes (11) to communicate with one another; and a drum (51) to which a central portion of the communicating hose (41) is secured, and onto which a left hose section (41a) and a right hose section (41b) are wound simultaneously. In order to bend the central portion of the communicating hose (41) into a U-shape to catch said central portion, the measuring device (1) includes a hose catching projection (51c) which protrudes from an outer peripheral surface of a shaft member (51a) of the drum (51), and a resin coil spring (42) mounted on the central portion of the communicating hose (41).

A tilt sensor includes a notification unit adapted to provide notification about occurrence of tilt; a water storage chamber that contains an electrolytic solution; and a unit cell that includes a positive electrode, a negative electrode, and a separator placed between the positive electrode and the negative electrode. When the water storage chamber tilts, the electrolytic solution is injected into the separator and the unit cell starts generating power and supplies electric power needed to drive the notification unit.

A tilt sensor includes a notification unit adapted to provide notification about occurrence of tilt; a water storage chamber that contains an electrolytic solution; and a unit cell that includes a positive electrode, a negative electrode, and a separator placed between the positive electrode and the negative electrode. When the water storage chamber tilts, the electrolytic solution is injected into the separator and the unit cell starts generating power and supplies electric power needed to drive the notification unit.

The optical fiber sensing method of the present invention includes steps of: joining heat shrinkable tubes to two ends of a sensing segment of an optical fiber; coupling a fixing element on the heat shrinkable tube below the sensing segment; detachably connecting at least one floating element to the fixing element; placing the floating element into a fluid; and providing an input signal to the sensing segment and generating an output signal after the input signal is processed by the sensing segment, wherein the tensile force applied to the sensing segment would change with variation of the buoyant force upon the floating element, resulting in change of the output signal. Accordingly, the optical fiber sensing method has numerous advantages, including rapid on-site construction, recyclability of components and changeability of design parameters.

A tiltmeter to measure a variation in inclination of a structure from a given starting position. The tiltmeter has two pots, each pot contains an identical volume and identical height of an identical liquid. A communication device connects the two pots and allows the liquid to flow between the two pots by the principle of communicating vessels. Two optical measuring devices are provided, one optical measuring device per pot. Each optical measuring device measures a variation in height of the level of liquid in the associated pot. The optical measuring devices are fiber optic devices coupled to a common light source.

A tiltmeter to measure a variation in inclination of a structure from a given starting position. The tiltmeter has two pots, each pot contains an identical volume and identical height of an identical liquid. A communication device connects the two pots and allows the liquid to flow between the two pots by the principle of communicating vessels. Two optical measuring devices are provided, one optical measuring device per pot. Each optical measuring device measures a variation in height of the level of liquid in the associated pot. The optical measuring devices are fiber optic devices coupled to a common light source.