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Development of Age-Estimation System Using Thermoluminescence

利用热释光的年龄估计系统的开发

基本信息

批准号：
07650290
负责人：
TAMAKI Shiro
金额：
$ 1.41万
依托单位：
UNIVERSITY OF THE RYUKYUS
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

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.

热释光(TL)是加热矿物时观察到的一种热致发光现象。天然矿物中的热释光在考古和地质领域中作为一种确定年龄的方法特别有用。由于热释光的量取决于样品的加热速度，因此控制系统的温度必须不断升高。在实际测量中，获得在150-400ﾟC温度范围内稳定的测量值是很重要的，但即使是商用的热释光测量仪器也往往达不到这一要求。为此，设计了三种温度控制方法，并研制了热释光强度测量系统。首先，引入H_∞控制方案，改善了低频域的跟踪特性和高频域的鲁棒稳定性。其次，提出了模型预测控制方案。这种方法避免了非线性系统的线性化，并提供了对非线性输入的鲁棒性。最后，将基于系统脉冲响应的最优数字反馈控制算法应用于该控制系统。这些控制方案表明，该系统可以在10 0~4 0 0ﾟC温度范围内，将恒定升温温度精确控制在1度的允许误差范围内。年龄估算是通过在恒定升温温度下测量的积分强度，计算采样区域的年累积剂量与自然累积剂量之和而得到的。测得的年龄估计数据与目前使用的数据相比是合理的。