采用虚拟仪器的种子呼吸测量系统设计

Design of seed respiration measurement system using virtual instrument

在种子呼吸CO2检测系统中,为了解决传统方法无法对种子呼吸CO2浓度实时测量的难题,本文根据种子呼吸CO2的特点,基于可调谐二极管激光吸收光谱(TDLAS)技术设计了基于虚拟仪器LabVIEW的种子呼吸检测系统。该系统主要包括激光光源及其控制器、基于多次反射池结构的种子呼吸容器、数据采集模块。上位机软件中主要设置了数据采集、信号处理、浓度反演等功能模块,其中浓度反演采用正交矢量的锁相放大算法,避免了参考信号与待测信号相位差产生的误差。实验结果表明,采用虚拟仪器软件实现的种子呼吸CO2检测系统,能够有效检测种子呼吸变化,抗干扰性和稳定性都较优,为后续的实验开展研发奠定了基础。

In the seed breathing CO2 detection system, the traditional method cannot measure the concentration of CO2 in the seed breathing in real time. According to the characteristics of seed breathing CO2, a seed breathing detection system based on virtual instrument LabVIEW is designed based on tunable diode laser absorption spectroscopy(TDLAS). The system mainly includes laser light source and its controller, seed breathing container based on multiple reflecting pool structure. The upper computer software is mainly set with data acquisition, signal processing, concentration inversion and other functional modules, in which the concentration inversion uses the orthogonal vector phase-locked amplification algorithm to avoid the error caused by the phase difference between the reference signal and the signal to be measured. The experimental results show that the CO2 detection system for seed respiration implemented by virtual instrument software can effectively detect the change of seed respiration, and has good anti-interference and stability, which lays a foundation for the subsequent experimental research and development.