JPS62197021U - - Google Patents

Description

[Brief explanation of drawings]

FIGS. 1 to 5 are diagrams showing embodiments 1 to 5 of this invention, respectively. FIG. 6 and FIG. 7 are diagrams for explaining the effects of the embodiment of this invention. FIGS. 8A and 8B are schematic diagrams showing an example of a conventional optical fiber sensor. FIG. 9, FIG. 10, and FIG. 11 are diagrams for explaining the temperature influence of a signal in an optical fiber sensor. In the figure, 20, 21, 50, 58 are light emitting elements, 26, 27, 52, 60 are optical fiber cables, 32, 42, 56 are light receiving elements, 24, 40 are current sources, 28, 36, 54 are temperature detection Part, 30,
38 is a current control unit, and 22 and 34 are constant temperature ovens.

Claims (1)

[Claims for Utility Model Registration] (1) An optical signal input/output control section, an optical fiber path coupled to the optical signal input/output control section, and an optical transducer section inserted into the optical fiber path,
An optical fiber sensor that calculates a measured value based on a change in an output optical signal with respect to an input optical signal, characterized in that the optical signal input/output control section is provided with signal amount correction means for temperature changes. . (2) The optical signal input/output control unit includes a light emitting element for applying an optical signal to the optical fiber path, and a current control unit for causing the light emitting element to emit light, and the signal amount correction means is configured to control the light emitting element or its The optical fiber sensor according to claim 1, which includes current correction means for detecting temperature changes in the vicinity and correcting the output current of the current control section. (3) The light emitting element is placed in a thermostatic oven to maintain a substantially constant temperature, and the signal amount correction means is configured to detect a change in temperature of the thermostatic oven. The optical fiber sensor according to the second item in the range. (4) The optical signal input/output control section includes a light receiving element that receives the optical signal output from the optical fiber path and converted by the optical transducer section, and a light receiving sensitivity adjustment that adjusts the light receiving sensitivity of the light receiving element. and the signal amount correction means includes means for detecting a temperature change in or near the light receiving element and correcting the adjustment value of the light receiving sensitivity adjustment part, as set forth in claim 1 of the utility model registration claim. fiber optic sensor. (5) The light-receiving element is arranged in a thermostatic oven to keep the temperature substantially constant, and the signal amount correction means is adapted to detect a change in temperature of the thermostatic oven. The optical fiber sensor according to item 4. (6) The optical signal input/output control unit includes a light receiving element that receives the optical signal output from the optical fiber path and converted by the optical transducer unit, and a known function that stores a known function given in advance. storage means; and arithmetic means for calculating a measured value based on the output of the light receiving element and the known function; The optical fiber sensor according to claim 1, further comprising: a calculated value correcting means for correcting the calculated value of the calculating means based on the output of the sensor.