Temperature distribution measurement device and temperature distribution measurement method
A technology of temperature distribution and measuring devices, applied in measuring devices, thermometers, thermometers with physical/chemical changes, etc., can solve problems such as high operating costs and unoptimized energy saving
Active Publication Date: 2014-04-16
FUJITSU LTD
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However, if the air conditioner with a large cooling capacity is always operated at its maximum capacity, not only the operating cost becomes higher, but also energy saving and CO 2 It is also not preferable from the point of view of reducing
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[0032] figure 1 It is a schematic diagram showing the configuration of the temperature distribution measurement device of the embodiment. in addition, figure 2 is a graph showing the spectrum of backscattered light.
[0033] Such as figure 1 , The temperature distribution measurement device 20 according to this embodiment has: a laser light source 21, lenses 22a, 22b, a spectroscope 23, a wavelength separation unit 25, a photodetector 26, and a temperature distribution measurement unit 27. The temperature distribution measurement device 20 Connected to the optical fiber 24 for use.
[0034] Laser light with a predetermined pulse width is output from the laser light source 21 at a fixed cycle. The laser light enters the optical fiber 24 from the light source side end of the optical fiber 24 through the lens 22a, the beam splitter 23, and the lens 22b. also, figure 1 Among them, 24a denotes the cladding of the optical fiber 24, and 24b denotes the core of the optical fibe...
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[Problem] To provide a temperature distribution measurement device and temperature distribution measurement method capable of readily configuring an appropriate transfer function in accordance with variation in the total length of an optical fiber. [Solution] A temperature distribution measurement device (20) comprises a laser light source (21) optically connected to an optical fiber (24), a photodetector (26) for detecting backscattered light inside the optical fiber (24), and a temperature distribution measurement unit (27) for making a corrective calculation using a transfer function for a provisional measured temperature distribution obtained from the output of the photodetector (26) to arrive at a true measured temperature distribution. The temperature distribution measurement unit (27) stores the transfer function data configured for each total length of the optical fiber (24) and each position in the lengthwise direction. The temperature distribution measurement unit (27) uses transfer function data to modify the transfer function employed in the corrective calculation when the length of the optical fiber (24) is modified.
Description
technical field [0001] The present invention relates to a temperature distribution measuring device and a temperature distribution measuring method using an optical fiber. Background technique [0002] In recent years, with the advent of a highly informationized society, computers are used to process a large amount of data. In facilities such as data centers, many computers are often installed in the same room for unified management. Under such circumstances, a large amount of heat is generated from the computer, causing malfunctions and malfunctions, and therefore means for cooling the computer is required. Therefore, in a data center, the heat generated in the computer is generally exhausted by a fan (blower), and the temperature in the room is adjusted by an air conditioner (air conditioner). [0003] However, the amount of heat generated from a computer varies greatly depending on the operating state of the computer. In order to reliably prevent computer malfunctions a...
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IPC IPC(8): G01K11/12
CPCG01K2011/324G01K11/32G01K11/324
Inventor 笠嶋丈夫宇野和史石锅稔只木恭子武井文雄
Owner FUJITSU LTD