| 摘要 |
<p>PURPOSE: To facilitate many kinds of heat sensing functions adaptive to various environmental conditions by setting heat sensing systems at the plural sections of an optical fiber and judgement values corresponding to the respective heat sensing systems and judging whether fires are generated at plural positions in a monitoring zone or not based on the set data. CONSTITUTION: A pulse driving part 21 is a light emitter for emitting pulse light according to a sampling trigger signal having fixed widthΔT0 and the pulse light is made incident from the input terminal of an optical fiber 1 through a light control part 22 provided with a beam splitter. A data processing part 24 calculates the temperature increase rate corresponding to the calculated temperature, which is calculated by processing light reception data photoelectrically transduced by a light receiving part 23, and temperature data in the past, which are stored in a temperature information memory 25, so that the light reception data can be transduced to temperature data and temperature increase rate data as temperature information and stored in the temperature information memory 25. A data diagnostic part 26 performs self-diagnosis based on the data and the presence/absence of abnormality is detected.</p> |
