A loading-dock signaling system includes an internal signal light, an external signal light and a wheel chock having a base and a handle extending from the base. A chock signal light is positioned on the handle. The internal signal light, the external signal light and the chock signal light are in signal communication with one another to provide at least a plurality of illuminated indicia to an exterior dock area and an interior dock area. The exterior dock area and the interior dock area are separated by a dock door.

A loading-dock signaling system includes an internal signal light, an external signal light and a wheel chock having a base and a handle extending from the base. A chock signal light is positioned on the handle. The internal signal light, the external signal light and the chock signal light are in signal communication with one another to provide at least a plurality of illuminated indicia to an exterior dock area and an interior dock area. The exterior dock area and the interior dock area are separated by a dock door.

A data telemetry system and method digitizes acoustic sensor data. Acoustic sensor data is digitized and used to apply strain to a series of Fiber Bragg Gratings (FBGs) in a fiber. Each FBG is assigned a nominal wavelength. A wavelength interrogator launches wavelengths into the fiber and scans the reflected wavelengths from the FBGs. A data telemetry rate of at least 5 kHz may be achieved. Acoustic sensors may be part of undersea acoustic sensing arrays with large element counts having reduced system cabling and improved Size, Weight and Power (SWaP). The system and method realizes low power loss per array element and efficient multiplexing of many data streams in a small form factor.

A leak detector includes a gas sensor and a purge gas supply in fluid communication with a probe head. The fluid communication has a first communication direction for the gas sensor and a second communication direction opposite to the first communication direction for the purge gas supply. The gas sensor and the purge gas supply are configured for communication through a common conduit for the fluid communication with the probe head through one or more probe head ports. Only one of the gas sensor or the purge gas supply can be in fluid communication with the probe head at a time.

A leak detector includes a gas sensor and a purge gas supply in fluid communication with a probe head. The fluid communication has a first communication direction for the gas sensor and a second communication direction opposite to the first communication direction for the purge gas supply. The gas sensor and the purge gas supply are configured for communication through a common conduit for the fluid communication with the probe head through one or more probe head ports. Only one of the gas sensor or the purge gas supply can be in fluid communication with the probe head at a time.

An optical transceiver includes a housing, a fastening component and a latch. The fastening component is disposed on the housing. The fastening component is movable with respect to the housing in a releasing direction from an electrical port of the optical transceiver toward a fiber optic port of the optical transceiver. The latch is movably disposed on the housing to be at either an unlocking position or a locking position. The fastening component is allowed to be moved with respect to the housing in the releasing direction when the latch is at the unlocking position, and a movement of the fastening component in the releasing direction is confined by the latch when the latch is at the locking position.

An optical transceiver includes a housing, a fastening component and a latch. The fastening component is disposed on the housing. The fastening component is movable with respect to the housing in a releasing direction from an electrical port of the optical transceiver toward a fiber optic port of the optical transceiver. The latch is movably disposed on the housing to be at either an unlocking position or a locking position. The fastening component is allowed to be moved with respect to the housing in the releasing direction when the latch is at the unlocking position, and a movement of the fastening component in the releasing direction is confined by the latch when the latch is at the locking position.

A specifying system according to the present disclosure includes an optical fiber (30) laid along a levee (20) of a river (10), a communication unit (41) configured to receive, from the optical fiber (30), an optical signal containing a pattern that changes according to a state of the levee (20), and a specifying unit (51) configured to specify a water level of the river (10) based on the pattern that changes according to the state of the levee (20).

A specifying system according to the present disclosure includes an optical fiber (30) laid along a levee (20) of a river (10), a communication unit (41) configured to receive, from the optical fiber (30), an optical signal containing a pattern that changes according to a state of the levee (20), and a specifying unit (51) configured to specify a water level of the river (10) based on the pattern that changes according to the state of the levee (20).

An optical fiber sensing system is acquired by adding an optical fiber sensing function to an optical communication cable system, and the optical fiber sensing is performed by an interrogator by sending probe light to an optical fiber, detecting backscattered light of the probe light, and performing sensing on environmental information around the optical fiber. A first sensing device installed at a remote place different from a terminal station of the optical communication cable system includes the interrogator, a power source unit configured to receive power via the optical communication cable system and supply power into the device, and a communication unit configured to communicate with a second sensing device. The interrogator generates sensing data at each point on the optical fiber by performing sensing on environmental information around the optical fiber being connected to the first sensing device.