The alkali-atom density measurement method based on light absorption is highly suitable for a spin-exchange relaxationfree(SERF)atomic magnetometer because of its high-precision measurement and complete nonmagnetic in...The alkali-atom density measurement method based on light absorption is highly suitable for a spin-exchange relaxationfree(SERF)atomic magnetometer because of its high-precision measurement and complete nonmagnetic interference.In this study,the optical rotation angle detection system based on polarization balance detection is utilized to realize the alkali-atom density real-time measurement without affecting magnetic field measurement.We discovered that there exists an optimal frequency detuning of the probe light,which offers the highest sensitivity in alkali-atom density measurement and the lowest susceptibility to temperature fluctuations in terms of the scale factor.In contrast to conventional light absorption measurements based on pump light,this method demonstrated a threefold improvement in alkali-atom density measurement sensitivity while remaining immune to ambient magnetic fields and incident light intensity fluctuations.Furthermore,we utilized this method to achieve closed-loop temperature control with an accuracy of 0.04℃.展开更多
Circuit of the temperature measurement equipment was improved in order to develop temperature telemetering system for cultivating fruit facilities.The traditional temperature measuring equipments used in monitoring te...Circuit of the temperature measurement equipment was improved in order to develop temperature telemetering system for cultivating fruit facilities.The traditional temperature measuring equipments used in monitoring temperature changes in greenhouse include mercury column,merbromine column,kerosene column glass rod thermometer and mechanical inductive thermometer.Compared with the traditional method of temperature measurement the new system reduces the labor requirement and promotes precision monitoring and control of the temperature.In addition,the temperature in the greenhouse was very accurate especially at night or in rainy and snowy weather.This new temperature telemetering system will promote the development of the fruit protection cultivation.展开更多
文摘The alkali-atom density measurement method based on light absorption is highly suitable for a spin-exchange relaxationfree(SERF)atomic magnetometer because of its high-precision measurement and complete nonmagnetic interference.In this study,the optical rotation angle detection system based on polarization balance detection is utilized to realize the alkali-atom density real-time measurement without affecting magnetic field measurement.We discovered that there exists an optimal frequency detuning of the probe light,which offers the highest sensitivity in alkali-atom density measurement and the lowest susceptibility to temperature fluctuations in terms of the scale factor.In contrast to conventional light absorption measurements based on pump light,this method demonstrated a threefold improvement in alkali-atom density measurement sensitivity while remaining immune to ambient magnetic fields and incident light intensity fluctuations.Furthermore,we utilized this method to achieve closed-loop temperature control with an accuracy of 0.04℃.
基金the International S&T Cooperation Project of China(Project No.2012DFR30700)Special Fund for Agro-scientific Research in the Public Interest of China(Project No.200903019)+1 种基金The Ministry of Agriculture 948 Project of China(Project No.2011-Z40)Shandong agricultural improved variety project[No.(2010)6]and Taian scientific and technological development planning item(20075014).
文摘Circuit of the temperature measurement equipment was improved in order to develop temperature telemetering system for cultivating fruit facilities.The traditional temperature measuring equipments used in monitoring temperature changes in greenhouse include mercury column,merbromine column,kerosene column glass rod thermometer and mechanical inductive thermometer.Compared with the traditional method of temperature measurement the new system reduces the labor requirement and promotes precision monitoring and control of the temperature.In addition,the temperature in the greenhouse was very accurate especially at night or in rainy and snowy weather.This new temperature telemetering system will promote the development of the fruit protection cultivation.
