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Development of Laser-Doppler Vibrating Tube Densimeter with High Accuracy at High Temperatures and Pressures.

高温高压高精度激光多普勒振动管密度计的研制。

基本信息

批准号：
10555260
负责人：
SMITH Richard Lee Jr.
金额：
$ 6.85万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555260/
关键词：
Supercritical water Vivrating Tube Densimeter High temperatures and pressures Laser Doppler

项目摘要

We have developed a new vibrating tube densimeter that is capable of measurements of up to 870 K and pressures to 70 Mpa. The densimeter features a δ-shaped design to enhance the length of vibration harmonics, laser-doppler detection of of vibration, wide-range piezoelectric input stimulus, real-time display of all vibration modes, and the elimination of all magnets and tube attachments. Vibrational stimulus is applied to a tube filled with the substance of interest over a time step with a piezoelectric actuator. The input stimulus is simultaneously sensed by computer. A helium-neon laser vibrometer is used to detect transient vibrational changes and an FFT analyzer provides all vibration modes. In the calibrations, the 5ィイD1thィエD1 vibrational mode was used to achieve the greatest sensitivity. A statistical method was applied to develop a calibration equation that was valid over a wide range of temperatures and pressures. A flow apparatus was constructed to PVT at high-temperature and high-pressure conditions. The system consisted of a syringe pump feed, high temperature oven with preheat, densimeter and syringe pump receiver. The feed pump was run in constant flow mode while the receiver pump was run in constant pressure mode.With this apparatus, densities of water, methanol, or water+methanol mixtures were measured at supercritical conditions with an accuracy of 0.006g/cmィイD13ィエD1, which is fairly larger number than the resolution. The new densimeter along with the laser detection method eliminates magnets and extends the range of current vibration-type densimeters.

我们开发了一种新型的振动管密度计，能够测量高达870 K和70 Mpa的压力。该密度计采用δ形设计，可增加振动谐波的长度，激光多普勒检测，可测量振动频率，宽范围压电输入激励，实时显示所有振动模式，并消除所有磁铁和管附件。利用压电致动器在时间步长内将振动刺激施加到填充有感兴趣的物质的管。输入的刺激被计算机同时感知。氦氖激光测振仪用于检测瞬态振动变化，FFT分析仪提供所有振动模式。在校准中，使用第5个λ D1振动模式来实现最大灵敏度。一个统计方法被应用到开发一个校准方程，是有效的，在很宽的温度和压力范围。建立了一套高温高压下的PVT流动装置。该系统由注射泵进料、具有预热的高温烘箱、密度计和注射泵接收器组成。在超临界条件下，用该装置测量了水、甲醇或水+甲醇混合物的密度，其精度为0.006g/cm ~ 2·D ~（13）·D ~（11），比分辨率大得多。新的密度计沿着激光检测方法，消除了磁铁，并扩大了目前的振动型密度计的范围。