| Project/Area Number |
08555053
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Yamanashi University |
|---|
Principal Investigator |
ICHIMIYA Koichi Yamanashi University, Dept.of Mech.Sys.Eng., Professor, 工学部, 教授 (30037923)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MATSUO Hideto Tetsudo-kizai Co.LTD., Development Dept., Director, 開発部, 部長(研究職)
YAMADA Jun Yamanashi University, Dept.of Mech.Sys.Eng., Associate Professor, 工学部, 助教授 (40210455)
|
|---|
| Project Period (FY) |
1996 – 1997
|
| Project Status |
Completed (Fiscal Year 1997)
|
| Budget Amount *help |
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥5,500,000 (Direct Cost: ¥5,500,000)
|
|---|
| Keywords | Thermometry / Radiative thermometry / Radiation / Thermal Imaging / Infrared radiation / Thermography |
|---|
| Research Abstract |
This study deals with a new thermal imaging system using a thermography. The imaging system enables us to visualize temperature of objects with unknown emissivities.
Applying two-color thermometry to conventional thermography is performed by dividing the detectable wavelength range of thermography into two different ranges using respective band-pass filters, i.e., when the radiation energy emitted from objects of interest is passed through one filter at a time, the energy distribution corresponding to each filter's wavelength range is obtained. A thermal image can then be constructed from the two energy distributions if the relation between the emissivities of the two wavelength ranges for each object is known in advance. Here, we assume the two emissivities of any object are equal to each other, which is reasonable since the detectable wavelength range is narrow and the wavelengths in each are close to each other.
We demonstrated that the system modifying a conventional thermography ena
… More
bles us to take a correct thermal image of objects having different temperatures and unknown emissivities. Furthermore, error analysis has been carried out to improve the accuracy of imaged temperature. Assuming that the imager's range of detectable wavelength is divided into two ranges at a wavelength, lambdad ; the shorter range than lambdad and the longer range, the effect of lambdad on the error of imaged temperature has been numerically investigated. In the numerical analysis, the several parameters, such as the monochromatic characteristics of the thermograph's sensor, are given by those of a commercial thermograph having an InSb sensor with detectable wavelength range of 3.0 - 5.4 mum. This analysis revealed that there is the optimum value of lambdad which minimizes the error of the imaged temperature.
The accuracy for imaged temperature in this system has been numerically compared with that of a conventional thermal imaging system. The error of imaged temperature in the present system is about ten times larger than that in conventional system, if the emissivity data of objects of interest can be precisely given in the conventional system. Less
|
