In order to solve the lack of relevant evaluation research on the accuracy of HMP155A humidity sensor calibration results in the past, this paper designs the corresponding experimental scheme, and obtains the correspo...In order to solve the lack of relevant evaluation research on the accuracy of HMP155A humidity sensor calibration results in the past, this paper designs the corresponding experimental scheme, and obtains the corresponding calibration results according to the experimental scheme;Then the measurement uncertainty of the indication error in the calibration results is evaluated by GUM, and the corresponding extended uncertainty </span><i><span style="font-family:Verdana;">U</span></i><sub><span style="font-family:Verdana;">95</span></sub><span style="font-family:Verdana;"> is obtained. Finally, according to the requirements of JJF1094-2016 characteristic evaluation of measuring instruments, combined with the calibration results and the actual situation of </span><i><span style="font-family:Verdana;">U</span></i><sub><span style="font-family:Verdana;">95</span></sub><span style="font-family:Verdana;">, the conformity of the indication error of calibration is determined. The result is that each calibration point of the sensor meets the requirements of conformity determination and is within the qualified range. This research effectively makes up for the blank of the previous research on the conformity determination of the indication error of the calibration results and has strong theoretical and practical significance.展开更多
The straight channel optical waveguide coated with the SnO_(2) nanoparticle is studied as an all-optical humidity sensor.The proposed sensor shows that the transmission loss of the waveguide increases with increasing ...The straight channel optical waveguide coated with the SnO_(2) nanoparticle is studied as an all-optical humidity sensor.The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity(RH)from 56%to 90%with very good repeatability.The sensitivity to changes in relative humidity is~2 dB/%RH.The response time of the humidity sensor is 2.5 s,and the recovery time is 3.5 s.The response to humidity can be divided into 3 different regions,which are correlated to the degree of water adsorption in the SnO_(2) nanoparticle layer.Compared with the previous all-optical humidity sensor based on SnO_(2),the proposed sensor exhibits more rapid response,simpler fabrication process,and higher sensitivity.The proposed sensor has a potential application in the long distance,remote agriculture,and biological humidity sensing.展开更多
To measure the performance of high precision air-pressure sensors in below normal pressure,an automatic measurement instrument has been designed and implemented.It can simulate environment of low pressure from 300hPa ...To measure the performance of high precision air-pressure sensors in below normal pressure,an automatic measurement instrument has been designed and implemented.It can simulate environment of low pressure from 300hPa to 1 000hPa with high accuracy by proportional-integral-derivative(PID)control quickly,and it can also generate various relative humidity by two-pressure control.The results show that this instrument can reach controlled pressure quickly.And it works well with the minimum average pressure difference,and the fluctuation is±0.02hPa at 500hPa.And it can keep in a stable status for a long time.It works well in performance testing of pressure sensors.The structure of the system is simple,takes small investment,and can be operated conveniently.展开更多
文摘In order to solve the lack of relevant evaluation research on the accuracy of HMP155A humidity sensor calibration results in the past, this paper designs the corresponding experimental scheme, and obtains the corresponding calibration results according to the experimental scheme;Then the measurement uncertainty of the indication error in the calibration results is evaluated by GUM, and the corresponding extended uncertainty </span><i><span style="font-family:Verdana;">U</span></i><sub><span style="font-family:Verdana;">95</span></sub><span style="font-family:Verdana;"> is obtained. Finally, according to the requirements of JJF1094-2016 characteristic evaluation of measuring instruments, combined with the calibration results and the actual situation of </span><i><span style="font-family:Verdana;">U</span></i><sub><span style="font-family:Verdana;">95</span></sub><span style="font-family:Verdana;">, the conformity of the indication error of calibration is determined. The result is that each calibration point of the sensor meets the requirements of conformity determination and is within the qualified range. This research effectively makes up for the blank of the previous research on the conformity determination of the indication error of the calibration results and has strong theoretical and practical significance.
基金supported by the Ministry of Research,Technology&Higher Education of Indonesia with PMDSU scholarship fundingthe Malaysia Ministry of Higher Education(MOHE)(LRGS(2015)/NGOD/UM/KPT)。
文摘The straight channel optical waveguide coated with the SnO_(2) nanoparticle is studied as an all-optical humidity sensor.The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity(RH)from 56%to 90%with very good repeatability.The sensitivity to changes in relative humidity is~2 dB/%RH.The response time of the humidity sensor is 2.5 s,and the recovery time is 3.5 s.The response to humidity can be divided into 3 different regions,which are correlated to the degree of water adsorption in the SnO_(2) nanoparticle layer.Compared with the previous all-optical humidity sensor based on SnO_(2),the proposed sensor exhibits more rapid response,simpler fabrication process,and higher sensitivity.The proposed sensor has a potential application in the long distance,remote agriculture,and biological humidity sensing.
基金National Basic Research Program of China(No.2011CB302104)Special Fund for Public Welfare(No.GYHY201004004)
文摘To measure the performance of high precision air-pressure sensors in below normal pressure,an automatic measurement instrument has been designed and implemented.It can simulate environment of low pressure from 300hPa to 1 000hPa with high accuracy by proportional-integral-derivative(PID)control quickly,and it can also generate various relative humidity by two-pressure control.The results show that this instrument can reach controlled pressure quickly.And it works well with the minimum average pressure difference,and the fluctuation is±0.02hPa at 500hPa.And it can keep in a stable status for a long time.It works well in performance testing of pressure sensors.The structure of the system is simple,takes small investment,and can be operated conveniently.
