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。

公开(公告)号：US20160349113A1

公开(公告)日：2016-12-01

申请号：US14724247

申请日：2015-05-28

Applicant: Raytheon Company

Inventor： Steven F. Cook

IPC: G01J3/453 ,  G01J3/02

CPC classification number: G01J3/453 ,  G01J3/027 ,  G01J3/0275 ,  G01J5/522

Abstract: The absolute spectral radiance of an unknown IR source is measured by bracketing the radiance measurements of the source over a spectral band with radiance measurements of a characterized blackbody at different temperatures. The absolute spectral radiance (or effective temperature) is calculated for the blackbody and paired with the relative radiance measurements. The absolute spectral radiance for the unknown IR source is derived via interpolation. The use of a characterized plate blackbody and a FTIRS allows for rapid and accurate characterization of the unknown IR source across a spectral band.

Abstract translation: 未知红外光源的绝对光谱辐射度是通过在不同温度下通过在特征黑体的辐射测量的光谱带上包围光源的辐射度测量来测量的。 计算黑体的绝对光谱辐射度（或有效温度），并与相对辐射度测量值配对。 未知红外光源的绝对光谱辐射是通过插值得出的。 使用特征板黑体和FTIRS可以快速准确地表征光谱带上的未知红外源。