Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (1): 10103-010103.doi: 10.11889/j.0253-3219.2017.hjs.40.010103


An NC-type relative humidity control device for in-situ experiments

ZENG Jianrong1, WANG Shouzhi2, CAO Lingling3, LI Yan1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
    3 School of Electronic Engineering, Chengdu Technological University, Chengdu 611730, China
  • Received:2016-11-07 Revised:2016-12-21 Online:2017-01-10 Published:2017-01-11
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11305242)


Background: Relative humidity (RH) is one of the key environmental parameters in many experimental processes, and RH control is particularly important for in-situ synchrotron radiation experiments. However, there is no suitable commercial RH control equipment available for such experiments. Purpose: Based on the dynamic control of microcontroller, this study aims to develop an integrated set of numerically controlled (NC) RH control device, which can be conveniently loaded on the synchrotron radiation end-stations. Methods: A moisture channel and another dry air channel are connected to the sample chamber for humidification and dehumidification respectively. The dynamic equilibrium of RH at various values is controlled by the microcontroller using a fuzzy algorithm. Results: This device can hold the RH with an error of ±1.0% at any set value from 20% to 94%. It also can increase the RH from 20% to 90% and decrease the RH from 90% to 20% with an error of ±1.5% at a constant speed. Conclusion: This device can provide RH controlling environment with three switchable operation modes including RH holding, increasing and decreasing. It can meet various requirements of humidity control in kinds of synchrotron radiation in-situ experiments.

Key words: Synchrotron radiation, Relative humidity, Numerical control

CLC Number: 

  • TL99