A environmental parameters monitoring system for high-precision geometric measurement

To ensure normal operation of precision geometric metrology, a system by means of software LabVIEW is developed for measuring environmental parameters such as temperature, humidity, air pressure and CO₂ content. According to the slow-changing characteristics of the environmental signals, the mean- and median- filter are integrated to process raw data detected. The data of humidity, air pressure and CO₂ content are almost no change whether the measuring machine running or not, while temperature uniformity changes a lot. When the machine is off, the 9 spots temperature uniformity (the difference among each measurement spots at same time) is less than 0.5°C/8h; when system is working, the maximum of temperature uniformity is 3°C/8h.Experiments show that the system can monitor the data changes of the environmental parameters.