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The Design of Double Wavelength Optical Fiber Pyrometer and Research of Data Wireless Transmission

Author: SunXiaoXi
Tutor: LiuPing
School: Northeastern University
Course: Mechanical Manufacturing and Automation
Keywords: Colorimetry Optical fiber Optical signal Electric signal Wireless data transmission
CLC: TH811
Type: Master's thesis
Year: 2008
Downloads: 51
Quote: 0
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Abstract


Currently used in the field of high temperature measurement thermometer they use-contact temperature measurement, temperature-sensitive element in direct contact with the measured object, such as widely used in the world of consumption-type thermocouple. Although the technology has been very mature, but there are still a lot of problems. Such as a temperature probe is a one-time, higher temperature measurement costs; must be replaced after each measurement probe, it is difficult to achieve automation; continuous high frequency temperature measurement. Especially in the environment of high temperature, high pressure, high magnetic field limit temperature measurement, temperature sensing element and even measuring instruments are highly vulnerable to damage and corrosion. With the development of optical fiber sensing technology, the rapid development of optical radiation thermometry technology fiber optic temperature measuring instrument practical application. Fiber-optic high-temperature measurements of the research instrument (for example) in order to measure the temperature of molten steel, non-contact temperature measurement methods, an excellent solution to the above problems, and using colorimetric, make up a small temperature range of the ordinary optical fiber thermometer, vulnerable thermometry environmental interference, large errors and shortcomings. Elaborated the basic principles of radiation thermometry, according to Planck's law and Wien's displacement law deduced the dual-wavelength colorimetry temperature theoretical formula, and analyze the advantages of the method: This method greatly reduces the emission rate the impact of temperature measurement results. This article describes in detail constitutes the principle and performance of the various parts of the fiber-type high-temperature measuring instrument, and a lot of related experiments. The design includes high temperature probe design study, photoelectric conversion and electronic signal amplification, signal processing and wireless data transmission. The specific step of the optical signal is extracted through the optical fiber probe, converts the light signal into a voltage signal by the photoelectric conversion circuit, the voltage signal with the size change of the light intensity of the radiation to reflect the actual temperature of the object. Very weak due to the voltage signal after photoelectric conversion, the need for the two amplified and filtered, so as to achieve the requirements of the digital-analog conversion, and then fed to the microcontroller, the system uses a 12-bit A / D and D / A converters, to ensure that there is sufficient precision protection. Software systems using structured programming methods in software design, the instrument used in all C51 prepared to improve the readability and portability. System hardware and software debugging through the FBI system, approximate linear relationship between the light intensity and the voltage last verified through simulation, and analysis of the instrument's measurement accuracy and measurement error. In addition, the instrument developed preliminary data wireless transmission function, low-power transmitter chip nRF401 the use of new technology, the chip operates in the 433MHz frequency. NRF401 RF transceiver chip wireless transceiver system design, low cost, short-range wireless data transmission has a wide range of applications. Wireless transmission instead of the original cable transmission, both economical, convenient and safe, timely transmission of measurement data to the host computer for storage, save large amounts of data for future inquiries. The fiber-optic high-temperature measuring instrument in various fields of application have broad prospects.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Thermal measuring instruments > Temperature measuring instruments
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