Development of Age-Estimation System Using Thermoluminescence
| Project/Area Number |
07650290
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | UNIVERSITY OF THE RYUKYUS |
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Principal Investigator |
TAMAKI Shiro UNIV.OF THE RYUKYUS,FAC.OF ENG.PROFESSOR, 工学部, 教授 (80163666)
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| Co-Investigator(Kenkyū-buntansha) |
TANAHARA Akira UNIV.OF THE RYUKYUS,FAC.OF SCI.ASSOCIATE PROF., 理学部, 助教授 (00217100)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | THERMOLUMINESCENCE / AGE-ESTIMATION SYSTEM / Hinfinity CONTROL METHOD / MODEL PREDICTIVE CONTROL / OPTIMAL DIGITAL CONTROLLER / IMPULSE RESPONSE FILTER / CONSTANT-RISING TEMPERATURE / HEAT TRANSFER SYSTEM / スペクトル解析 / H無限大最適制御 / 温度制御系 / ウェーブレット変換 / 発光スペクトル / ウエーブレット変換 / 非線形特性 / 定速昇温制御 / ロバスト制御 / ウエーブレット解析 / アイオニウム法 |
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| Research Abstract |
Thermoluminescence (TL) is a calorescence phenomenon observed while heating minerals. TL from the natural mineral is particularly useful as a method of age determination in the archaeological and geological fields. Since the TL quantity depends on the heating rate of the specimens, constant raising of the temperature for the control system is necessary. In actual measurement it is important to obtain a stable measurement value in temperature range 150-400ﾟC.However, even the commercial apparatus for TL measurement usually fails this requirement.
This paper progress a new TL age-estimating method. To establish for this, three temperature control methods are designed and a measurement system for TL intensity is developed. Firstly, the H infinity control scheme is introduced to archive the improvement of tracking characteristics of low-frequency domain and robust stability in the high-frequency domain. Secondly, model predictive control scheme has proposed. This method avoid the linearization of a non-linear system and provides and provides robustness against non-linear input. Finally, the optimal digital feedback control algorithm based on impulse response of the system is applied to this control system. These control schemes show that the system can precisely control the constant raising temperature within permissive error of 1 degree for the temperature range 100-400ﾟC.
The age is estimated by calculating the proportion of the annual cumulative dose at sampling area to the sum of natural cumulative dose that obtained TL by integrated intensity measured at a constant rising temperature. The measured age estimation data is reasonable comparing with currently in use.
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Report
(4 results)
Research Products
(18 results)
