Development of simple apparatus for measuring liquid-concentration by ultrasonic light diffraction effect

利用超声波光衍射效应测量液体浓度的简易装置的研制

基本信息

批准号：
12650051
负责人：
IKEDA Kiyoshi
金额：
$ 0.51万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650051/
关键词：
liquid concentration acousto-optic effect ultrasonic measurement light deflection sound velocity saccharose solution Raman-Nath diffraction food industry 超音波

项目摘要

We developed a measuring apparatus which has the absolute value for a sensitivity of the tracker voltage ,i.e., 35.3m V/ % at the driving ultrasonic frequency of 29.998 MHz using Raman-Nath diffraction effect owing to measure the concentration of the NaCl and saccharose solutions as liquid specimens. A summary of the other achievements is shown below.1. In the case of measuring the concentration for the 0.0-1.0 % NaCl and 0.0-5.0 % sugar solution, its measuring system may be designed using a deviation factor of 0.0078.2. Moreover, it became clear that the same temperature-compensation factor can be used for both the NaCl and sugar solutions deriving from the empirical equations of sound velocity. Specifically, its value in a 0.0-1.0 % NaCl solution at f_o=2.15 MHz for the PLLM is 3.381 kHz/℃, and that in a 0.0-5.0 % sugar solution is 3.379 kHz/℃ within the range of 25℃ ±2℃.3. The basic measuring values are obtained by the use of measuring apparatus which is equipped on the simple steel experimental optical tables without the vibration isolation mechanism4. There is no necessity for using always the glass plate for the transmission plane of the AO cell. The acrylic plate is enough suitable for the transmission plane for light at the cell.5. The most suitable value for the distance between the vidicon camera tube and the bright spot on the screen at the iris diaphragm is 30〜100mm to measure extreme sensitively the tracker voltage at the frequency used Raman-Nath diffraction effect.6. A temperature-compensation circuit is necessary due to the frequency proportional coefficient for the temperature sensitivity S_<tf> = 0.201 mV/ ℃.・MHz.7. From the experimental results and the deviation factor derived using the empirical equation of sound velocity obtained by the phase-locked loop ( PLL ), it was found that the sensitivity for the PLL-type AO improves 2.35 times that for an ordinary AO at f_a = 22.898 MHz.

我们开发了一种测量装置，由于测量氯化钠和蔗糖溶液的浓度，利用拉曼-纳斯衍射效应，在29.998 MHz的驱动超声波频率下，跟踪器电压的灵敏度绝对值为35.3m V/%其他成果总结如下： 1. 测量 0.0-1.0 % NaCl 的浓度。对于 0.0-5.0% 的糖溶液，其测量系统可以使用 0.0078.2 的偏差因子进行设计。此外，根据经验方程推导得出，相同的温度补偿因子可用于 NaCl 和糖溶液。具体而言，PLLM 在 0.0-1.0% NaCl 溶液中 f_o=2.15 MHz 时的声速值为 3.381 kHz/℃， 0.0-5.0%糖溶液在25℃±2℃范围内为3.379kHz/℃。 3.基本测量值是利用简单钢实验光学上配备的测量装置获得的。没有隔振机构的桌子4. 没有必要始终使用玻璃板作为AO 单元的传输平面，亚克力板足以适合单元处的光传输平面。5。距离摄像机管与虹膜光阑处屏幕上的亮点之间的距离为30~100mm，以极其灵敏地测量使用拉曼-纳斯衍射效应的频率下的跟踪器电压。6．由于该频率，需要一个温度补偿电路。温度灵敏度的比例系数S_<tf> = 0.201 mV/℃.·MHz.7. 根据实验结果和使用声速经验方程导出的偏差因子通过锁相环（ PLL ），发现在 f_a = 22.898 MHz 时，PLL 型 AO 的灵敏度比普通 AO 提高了 2.35 倍。