An optical loopback member attaches to a counterpart optical connector to face a plurality of optical fibers of the counterpart optical connector that includes a first input optical fiber, second input optical fiber, first output optical fiber, and second output optical fiber. The optical loopback member includes a first reflector including: a first output light reflection surface that reflects a first output light, outputted in a first direction, from the first output optical fiber; and a first input light reflection surface that reflects light reflected by the first output light reflection surface and directs the reflected light to the first input optical fiber arranged in a second direction with respect to the first output optical fiber. The second direction is perpendicular to the first direction.

An optical loopback member attaches to a counterpart optical connector to face a plurality of optical fibers of the counterpart optical connector that includes a first input optical fiber, second input optical fiber, first output optical fiber, and second output optical fiber. The optical loopback member includes a first reflector including: a first output light reflection surface that reflects a first output light, outputted in a first direction, from the first output optical fiber; and a first input light reflection surface that reflects light reflected by the first output light reflection surface and directs the reflected light to the first input optical fiber arranged in a second direction with respect to the first output optical fiber. The second direction is perpendicular to the first direction.

An optical safety sensor is inexpensively implemented. An optical safety sensor includes: a plurality of light projectors/receivers (a first light projector/receiver and a second light projector/receiver), which includes light projecting portions and light receiving portions; distance measurement portions, which measure distances using the time from light projecting to light receiving; and detection portions, which detect, based on measurement results, an abnormality occurring in any one of the plurality of light projectors/receivers; each of the light receiving portion provided in the plurality of light projectors/receivers receives reflected light caused by the light projected from the light projecting portions of all the plurality of light projectors/receivers.

An optical safety sensor is inexpensively implemented. An optical safety sensor includes: a plurality of light projectors/receivers (a first light projector/receiver and a second light projector/receiver), which includes light projecting portions and light receiving portions; distance measurement portions, which measure distances using the time from light projecting to light receiving; and detection portions, which detect, based on measurement results, an abnormality occurring in any one of the plurality of light projectors/receivers; each of the light receiving portion provided in the plurality of light projectors/receivers receives reflected light caused by the light projected from the light projecting portions of all the plurality of light projectors/receivers.

Techniques are disclosed that facilitate use of a distributed vibration sensing system for collecting data in a well application to provide improved collection of strain related data, such as for a seismic survey. The techniques facilitate selection of a variable optimal gauge length that optimally preserves the signal bandwidth and temporal resolution of the sensing system and that can be tuned using the actual apparent velocity and maximum recoverable frequency of the monitored parameters. Techniques for real-time processing of DVS data using a preliminary variable optimal gauge length are disclosed, as well as techniques for re-processing the DVS data at a later time using an updated variable optimal gauge length that is derived from the preliminary processing of the DVS data.

Techniques are disclosed that facilitate use of a distributed vibration sensing system for collecting data in a well application to provide improved collection of strain related data, such as for a seismic survey. The techniques facilitate selection of a variable optimal gauge length that optimally preserves the signal bandwidth and temporal resolution of the sensing system and that can be tuned using the actual apparent velocity and maximum recoverable frequency of the monitored parameters. Techniques for real-time processing of DVS data using a preliminary variable optimal gauge length are disclosed, as well as techniques for re-processing the DVS data at a later time using an updated variable optimal gauge length that is derived from the preliminary processing of the DVS data.

A flexible optical measuring device comprises an optical distance measuring module, an optical fiber adapter and an optical coupling module. The optical distance measuring module comprises a light source, an optical receiver and a computing unit. The optical fiber adapter is disposed and connected between the optical distance measuring module and the optical coupling module. The optical coupling module comprises a first optical fiber, a two-in-one optical coupler, a detector and a second optical fiber. A measuring beam is emitted from the light source and reaches the detector. The measuring beam then passes through the detector to the object and forms a reflected beam which is reflected back to the detector, then enters the second optical fiber and passes through the optical receiver and the optical receiver outputs a measurement signal. The computing unit calculates the distance between the object and a terminal of the detector accordingly.

An electronic device includes a case, a manipulation ring disposed on the case, a rotational unit, a waterproof member, and an optical tracking system (OTS) sensor. The case has a first chamber and a second chamber arranged outside the first chamber. The case has a thru-hole arranged between the first and second chambers. The rotational unit includes a shaft and a mating member arranged in the second chamber and connected to the shaft. The shaft has a first segment arranged in the first chamber and a second segment arranged in the thru-hole. The manipulation ring is spinable to rotate the mating member and the shaft. The waterproof member is configured to seal a gap between the second segment and an inner wall of the case defining the thru-hole. The OTS sensor is arranged in the first chamber and is corresponding in position to the first segment.

An electronic device includes a case, a manipulation ring disposed on the case, a rotational unit, a waterproof member, and an optical tracking system (OTS) sensor. The case has a first chamber and a second chamber arranged outside the first chamber. The case has a thru-hole arranged between the first and second chambers. The rotational unit includes a shaft and a mating member arranged in the second chamber and connected to the shaft. The shaft has a first segment arranged in the first chamber and a second segment arranged in the thru-hole. The manipulation ring is spinable to rotate the mating member and the shaft. The waterproof member is configured to seal a gap between the second segment and an inner wall of the case defining the thru-hole. The OTS sensor is arranged in the first chamber and is corresponding in position to the first segment.

A flexible optical measuring device comprises an optical distance measuring module, an optical fiber adapter and an optical coupling module. The optical distance measuring module comprises a light source, an optical receiver and a computing unit. The optical fiber adapter is disposed and connected between the optical distance measuring module and the optical coupling module. The optical coupling module comprises a first optical fiber, a two-in-one optical coupler, a detector and a second optical fiber. A measuring beam is emitted from the light source and reaches the detector. The measuring beam then passes through the detector to the object and forms a reflected beam which is reflected back to the detector, then enters the second optical fiber and passes through the optical receiver and the optical receiver outputs a measurement signal. The computing unit calculates the distance between the object and a terminal of the detector accordingly.