权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Developmental of high precision incremental heating device for Ar-Ar single mineral dating

Ar-Ar单矿物测年高精度增量加热装置的研制

基本信息

批准号：
06554022
负责人：
ITAYA Tetsumaru
金额：
$ 6.4万
依托单位：
Okayama University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06554022/
关键词：
Single mineral crystal Ar-Ar dating Laser probe High sensitive mass spectrometer Stepwise heating Infrared thermometer Temperature control Computer control 高感度質量分析

项目摘要

It is most important to analyze argon isotopes in gas phase fractions extracted from a single mineral by incremental heating for highly reliable Ar-Ar dating. This study is to develop a high precision incremental heating device with the temperature control system by using a laser probe heating apparatus and an infrared thermometer and to apply it to Ar-Ar single mineral dating. We have bought the main apparatuse of an infrared thermometer and then carried out the basic experiments using it and the former laser probe heating apparatuse. The new device to be developed makes it possible to measure the high temperature range using only the detector for medium temperature of infrared thermometer though the commercial base infrared thermometer has required the high temperature detector to measure the temperatures. This case follows our original idea to use a specific filter in measuring the high temperatures. In the calibration for energy loss of infrared rays coming through the filfter, we … More did not choose to re-write the program installed in the converter and does in stead to make a calibration curve between the true temperature and the out put voltage. This makes it possible to measure precisely and easily the sample temperatures controlled by laser incremental heating. This technique has been applied to Ar-Ar mineral dating of natural samples and some results have been presented at conferences.In proceeding this project, there is a by-product ; we had to modify slightly the content of this project. This lead us to recognize a economical but precise quadruple mass spectrometer for qualitative and quantitative analyzes of gas species extracted from specimens in meddium temperature range. This mass spectrometer makes it possible to measure immediately mass spector of gas species of which the intensity change quickly in time and to estimate the absolute abundance of each gas species at the time zero when the gas was introduced into the mass spectrometer. In highly reliable Ar-Ar dating, it is neccessary to take the age spectrum for many incremental heating gas fractions, requiring decreasing of analysing time of each fraction. This new mass spectrometer makes it possible to evaluate the gas purification time before introducing the gas into mass spectrometer. Less

对于高可靠的Ar-Ar定年，最重要的是从单一矿物中提取的气相馏分中通过增量加热分析氩同位素。本研究利用激光探针加热装置和红外测温仪，研制了一种具有温度控制系统的高精度增量加热装置，并将其应用于Ar-Ar单矿物定年。我们购买了一台红外测温仪的主要设备，然后用它和以前的激光探头加热设备进行了基础实验。所开发的新装置使商用红外测温仪的介质温度仅使用探测器即可测量高温范围成为可能，而商用红外测温仪则需要使用高温探测器来测量温度。这种情况沿用了我们最初的想法，使用特定的过滤器来测量高温。在对经过滤波器的红外线能量损失的校准中，我们没有选择重新编写安装在转换器中的程序，而是在真实温度和输出电压之间制作校准曲线。这使得激光增量加热控制样品温度的精确测量成为可能。该技术已应用于天然样品的Ar-Ar矿物定年，并在会议上发表了一些结果。在进行这个项目的过程中，有一个副产品；我们不得不稍微修改一下这个项目的内容。这使我们认识到一种经济而精确的四联质谱计，用于中温范围内样品中提取的气体种类的定性和定量分析。该质谱仪可以立即测量强度随时间变化较快的气体种类的质谱仪，并可以估计气体引入质谱仪时零时刻每种气体种类的绝对丰度。在高可靠的Ar-Ar定年中，需要对许多增量加热气体馏分取年龄谱，这就要求减少每个馏分的分析时间。这种新型质谱仪可以在将气体引入质谱仪之前对气体的净化时间进行评估。少