Using Infrared Sensor for Large Area Canopy Total Temperature Measurements of Rice Plants

2013 ◽  
Vol 29 (1) ◽  
pp. 115-122 ◽  
Author(s):  
M. Wang ◽  
D. Dong ◽  
W. Zheng ◽  
L. Jiao ◽  
X. Zhao ◽  
...  
Keyword(s):  
Temperature Measurements ◽  
Infrared Sensor ◽  
Large Area ◽  
Rice Plants ◽  
Total Temperature

scholarly journals Large Area Divertor Temperature Measurements Using A High-speed Camera With Near-infrared FiIters in NSTX

2011 ◽  
Author(s):  
B C Lyons ◽  
S J Zweben ◽  
T K Gray ◽  
J Hosea ◽  
R Kaita ◽  
...  
Keyword(s):  
High Speed ◽  
Near Infrared ◽  
Temperature Measurements ◽  
High Speed Camera ◽  
Large Area

An Analysis of the Efficacy of Wayside Hot-Box Detector Data

2018 ◽  
Author(s):  
Constantine Tarawneh ◽  
James A. Aranda ◽  
Veronica V. Hernandez ◽  
Claudia J. Ramirez
Keyword(s):  
Field Test ◽  
Dynamic Test ◽  
Operating Conditions ◽  
Temperature Measurements ◽  
Sensor Data ◽  
Similar Distribution ◽  
Infrared Sensor ◽  
Ir Sensor ◽  
The University ◽  
Class F

Wayside hot-box detectors (HBDs) are devices that are currently used to monitor bearing, axle, and brake temperatures as a way of assessing railcar component health and to indicate any possible overheating or abnormal operating conditions. Conventional hot-box detectors are set to alarm whenever a bearing is operating at a temperature that is 94.4°C (170°F) above ambient, or when there is a 52.8°C (95°F) temperature difference between two bearings that share an axle. These detectors are placed adjacent to the railway and utilize an infrared sensor in order to obtain temperature measurements. Bearings that trigger HBDs or display temperature trending behavior are removed from service for disassembly and inspection. Upon teardown, bearings that do not exhibit any discernible defects are labeled as “non-verified”. The latter may be due to the many factors that can affect the measurement of HBDs such as location of the infrared sensor and the class of the bearing among other environmental factors. A field test was performed along a route that is more than 483 km (300 mi) of track containing 21 wayside hot-box detectors. Two freight cars, one fully-loaded and one empty, and one instrumentation car pulled by a locomotive were used in this field test. A total of 16 bearings (14 Class F and 2 Class K) were instrumented with K-type bayonet thermocouples to provide continuous temperature measurement. The data collected from this field test were used to perform a systematic study in which the HBD IR sensor data were compared directly to the onboard thermocouple data. The analyses determined that, in general, HBDs tend to overestimate Class K bearing temperatures more frequently than Class F bearing temperatures. Additionally, the temperatures of some bearings were underestimated by as much as 47°C (85°F). Furthermore, the HBD data exhibited some false trending events that were not seen in temperature histories recorded by the bayonet thermocouples. The findings from the field test suggest that HBDs may inaccurately report bearing temperatures, which may contribute to the increased percentage of non-verified bearing removals. To further investigate the accuracy of the wayside detection systems, a dynamic test rig was designed and fabricated by the University Transportation Center for Railway Safety (UTCRS) research team at the University of Texas Rio Grande Valley (UTRGV). A mobile infrared sensor was developed and installed on the dynamic tester in order to mimic the measurement behavior of a HBD. The infrared temperature measurements were compared to contact thermocouple and bayonet temperature measurements taken on the bearing cup surface. The laboratory-acquired data were compared to actual field test data, and the analysis reveals that the trends are in close agreement. The large majority of temperature measurements taken using the IR sensor have been underestimated with a similar distribution to that of the data collected by the HBDs in field service.

Unsteady Total Temperature Measurements Downstream of a High-Pressure Turbine

1998 ◽  
Vol 120 (4) ◽  
pp. 760-767 ◽  
Author(s):  
D. R. Buttsworth ◽  
T. V. Jones ◽  
K. S. Chana
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Wind Tunnel ◽  
Convective Heat Transfer Coefficient ◽  
Fast Response ◽  
Temperature Measurements ◽  
High Pressure Turbine ◽  
Response Device ◽  
Temperature Probe ◽  
Total Temperature

An experimental technique for the measurement of flow total temperature in a turbine facility is demonstrated. Two thin film heat transfer gases located at the stagnation point of fused quartz substrates are operated at different temperatures in order to determine the flow total temperature. With this technique, no assumptions regarding the magnitude of the convective heat transfer coefficient are made. Thus, the probe can operate successfully in unsteady compressible flows of arbitrary composition and high free-stream turbulence levels without a heat transfer law calibration. The operation of the total temperature probe is first demonstrated using a small wind tunnel facility. Based on results from the small wind tunnel tests, it appears that the probe total temperature measurements are accurate to within ±1 K. Experiments using the probe downstream of a high-pressure turbine stage are than described. Both high and low-frequency components of the flow total temperature can be accurately resolved with the present technique. The probe measures a time-averaged flow total temperature that is in good agreement with thermocouple measurements made downstream of the rotor. Frequencies as high as 182 kHz have been detected in the spectral analysis of the heat flux signals from the total probe. Through comparison with fast-response aerodynamic probe measurements, it is demonstrated that the current measurement location, the total temperature fluctuations arise mainly due to the isentropic extraction of work by the turbine. The present total temperature probe is demonstrated to be an accurate, robust, fast-response device that is suitable for operation in a turbomachinery environment.

Real-Time Signal Processing Method for Infrared Sensor Arrays

2011 ◽  
Vol 105-107 ◽  
pp. 1835-1838
Author(s):  
Fu Xiang Zhang ◽  
Wen Zhong Li
Keyword(s):  
Real Time ◽  
Sensor Arrays ◽  
Time Signal ◽  
Infrared Sensor ◽  
Large Area ◽  
Infrared Sensors ◽  
Flexible Sensors ◽  
New Type ◽  
Different Color ◽  
Low Sensitivity

Infrared sensor arrays is a new type of apperceiving system of robots, which are made up of large-area and flexible sensors with data processing capabilities. In order to meet the requirement of real-time obstacle avoidance, sensors which can be covered on the surface of robots were designed to apperceive the environment and provide the environmental information by the infrared sensors and the controlling circuit on them. To get rid of the environmental disturbance to the infrared sensors, and to meet the requirement of system precision, real time and stability, a kind of reconfigurable architecture based on DSP+FPGA was designed and a kind of spectrum analyzing method based on FFT (Fast Fourier Transform) was used. Tests of the system with different color papers as the measured subjects showed that the output of sensor arrays had low sensitivity.

An Infrared Sensor for Large Area Temperature—To Avoid the Influence of Height

2016 ◽  
Vol 13 (4) ◽  
pp. 2340-2346
Author(s):  
Yun Lang ◽  
Leizi Jiao ◽  
Chong Jin ◽  
Dashan Wang ◽  
Jianping Liang ◽  
...  
Keyword(s):  
Infrared Sensor ◽  
Large Area
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