公开(公告)号：US09970821B2

公开(公告)日：2018-05-15

申请号：US14688617

申请日：2015-04-16

Applicant: Raytheon Company

Inventor： Steven F. Cook ,  Colton L. Noble ,  Justan V. Forsyth

IPC: G01J5/00 ,  G01J5/08

CPC classification number: G01J5/0003 ,  G01J5/00 ,  G01J5/0887

Abstract: A high SNR in-situ measurement of sample radiance in a low-temperature ambient environment is used to accurately characterize sample emissivity for transmissive, low-emissivity samples. A low-e mirror is positioned behind the sample such that the sample and low-e mirror overfill the field-of-view (FOV) of the radiometer. The sample is heated via thermal conduction in an open environment. Thermal conduction heats the sample without raising the background radiance appreciably. The low-e mirror presents both a low emission background against which to measure the sample radiance and reflects radiance from the back of the sample approximately doubling the measured signal. The low-e mirror exhibits a reflectance of at least 90% and preferably greater than 98% and an emissivity of at most 7.5% and preferably less than 2% over the spectral and temperature ranges at which the sample emissivity is characterized.

公开(公告)号：US20160305821A1

公开(公告)日：2016-10-20

申请号：US14688617

申请日：2015-04-16

Applicant: Raytheon Company

Inventor： Steven F. Cook ,  Colton L. Noble ,  Justan V. Forsyth

IPC: G01J5/00

CPC classification number: G01J5/0003 ,  G01J5/00 ,  G01J5/0887

Abstract: A high SNR in-situ measurement of sample radiance in a low-temperature ambient environment is used to accurately characterize sample emissivity for transmissive, low-emissivity samples. A low-e mirror is positioned behind the sample such that the sample and low-e mirror overfill the field-of-view (FOV) of the radiometer. The sample is heated via thermal conduction in an open environment. Thermal conduction heats the sample without raising the background radiance appreciably. The low-e mirror presents both a low emission background against which to measure the sample radiance and reflects radiance from the back of the sample approximately doubling the measured signal. The low-e mirror exhibits a reflectance of at least 90% and preferably greater than 98% and an emissivity of at most 7.5% and preferably less than 2% over the spectral and temperature ranges at which the sample emissivity is characterized.

Abstract translation: 在低温环境下采用高信噪比原样测量样品辐射，用于准确表征透射低发射样品的样品辐射率。 低e镜位于样品后面，使得样品和低e镜超过辐射计的视野（FOV）。 样品在开放环境中通过热传导加热。 热传导加热样品，而不会明显提高背景亮度。 低e镜呈现低发射背景，可测量样品辐射，并反射样品背面的辐射率近似将测量信号加倍。 低辐射镜在表征样品辐射率的光谱和温度范围内呈现至少90％，优选大于98％的反射率和至多7.5％，优选小于2％的发射率。