Sensing range limiting device
AssigneeNEC Corporation
InventorYutaka Yano
Life of this patent
Estimating the term…
Abstract
An optical fiber sensing range limiting device comprises: a blocking unit that, on the basis of a control signal and for a prescribed period, causes probe light that has been sent to an optical fiber used in optical fiber sensing and has returned from the optical fiber to be blocked from being transmitted to a light detection unit, or causes a detection signal that is detected with respect to the return light to be blocked from being transmitted to a downstream processing unit; and a control unit that outputs the control signal to the blocking unit. The prescribed period includes a period corresponding to the positional range for which acquisition of information from the detection signal is prohibited or for which it is undesirable to acquire the information.
Claims14
A sensing range limiting device comprising:
- a blocking unit configured to block transmission of return light to a light detection unit or transmission of a detection signal to a downstream processing unit, based on a control signal, for a predetermined period, the return light being relevant to probe light being transmitted to an optical fiber to be used for optical fiber sensing and being from the optical fiber, the detection signal being a signal detected with respect to the return light;
- and
- a control unit configured to output the control signal to the blocking unit,
- wherein
- in case where the blocking unit blocks the transmission of the return light to the light detection unit, the predetermined period includes a period during which the return light from a regulation area, the regulation area being a section of the optical fiber in which acquisition of information on the optical fiber sensing is regulated, is input to the blocking unit, and
- in case where the blocking unit blocks the transmission of the detection signal to the downstream processing unit, the predetermined period includes a period during which the detection signal obtained by detecting the return light from the regulation area is input to the blocking unit.
A transmitting and receiving device comprising:
- a receiving device;
- and a transmitting device that performs the transmission, wherein
- the receiving device includes a sensing range limiting device and a detection unit configured to perform the detection, wherein
- the sensing range limiting device includes
- a blocking unit configured to block transmission of return light to a light detection unit or transmission of a detection signal to a downstream processing unit, based on a control signal, for a predetermined period, the return light being relevant to probe light being transmitted to an optical fiber to be used for optical fiber sensing and being from the optical fiber, the detection signal being a signal detected with respect to the return light;
- and
- a control unit configured to output the control signal to the blocking unit, wherein
- in case where the blocking unit blocks the transmission of the return light to the light detection unit, the predetermined period includes a period during which the return light from a regulation area, the regulation area being a section of the optical fiber in which acquisition of information on the optical fiber sensing is regulated, is input to the blocking unit, and
- in case where the blocking unit blocks the transmission of the detection signal to the downstream processing unit, the predetermined period includes a period during which the detection signal obtained by detecting the return light from the regulation area is input to the blocking unit, wherein
- setting of one or more pieces of first combination information is enabled, the first combination information being information indicating a combination of a target range and an execution condition, the target range being the positional range for which blocking processing being processing for the blocking to be performed by the control unit is performed, the execution condition being a condition under which the blocking processing is performed for the positional range being predetermined, wherein
- a change of the first combination information is enabled, wherein
- the acquisition is prevented from being performed unless predetermined setting information within a validity period is input, and
- the setting information is information including the first combination information.
Dependencies are inferred from the claim text.