Thermal imaging system
    1.
    发明授权
    Thermal imaging system 失效
    热成像系统

    公开(公告)号:US06175113B1

    公开(公告)日:2001-01-16

    申请号:US09043496

    申请日:1998-03-27

    IPC分类号: G01J530

    CPC分类号: H04N5/33 G01J5/522 H04N5/3651

    摘要: A thermal imaging system (10) which is accoupled and by scanning recreates a thermal image by superimposing measured variations in infrared emission from a scene (22) onto a reference level supplied by a light emitting diode (28). The diode (28) is both a positive and negative luminescent emitter. Emitted flux is current controlled to be equivalent to black body radiation at a range of temperatures which may be colder or hotter than ambient. A signal generated with the system (10) switches between scene and diode observation is a measure of the difference between the mean scene temperature and the diode effective temperature. In response to this digital, control means adjust the bias current through the diode (28) in order to reduce the temperature difference. The reference temperature converges towards the mean scene temperature as this process is repeated. Absolute temperature is thus restored and some image defects removed.

    摘要翻译: 通过将来自场景(22)的红外发射中的测量变化叠加到由发光二极管(28)提供的参考电平上而被耦合并通过扫描重新产生热图像的热成像系统(10)。 二极管(28)既是正的和负的发光发射器。 电流通量控制在相当于在比环境温度更冷或更热的温度范围内的黑体辐射。 通过系统(10)产生的信号在场景和二极管观测之间切换是平均场景温度和二极管有效温度之间差异的度量。 响应于该数字,控制装置调节通过二极管(28)的偏置电流,以便降低温度差。 当该过程重复时,参考温度趋向于平均场景温度。 因此恢复绝对温度并消除一些图像缺陷。

    Thermal sensing system having a fast response calibration device
    2.
    发明授权
    Thermal sensing system having a fast response calibration device 失效
    具有快速响应校准装置的热感测系统

    公开(公告)号:US6127679A

    公开(公告)日:2000-10-03

    申请号:US983349

    申请日:1998-01-09

    摘要: A thermal sensing system (10) including an array of photon detectors (14) produces a detector-dependent response to irradiation. Variations in individual detector characteristics produce a fixed pattern noise which degrades an image or other response. A switchable mirror (M1) may at one position (P.sub.cal) direct infrared radiation from a light emitting diode (20) onto the detector array (14). The diode (20) is both a negative and positive luminescent emitter, the flux emitted is current controlled to be equivalent to black body radiation at a range of temperatures both colder and hotter than ambient. Calibration relationships comprising transfer functions relating incident intensity to signal response are derived for each detector. Alternatively the mirror (M1) may be at an observation position (P.sub.obs) and infrared radiation from a remote scene reaches the detector array (14). Resulting detector signals are converted into corrected fluxes using individual calibration relationships previously derived and an image or response with reduced fixed pattern noise is obtained.

    摘要翻译: PCT No.PCT / GB96 / 01805 Sec。 371日期1998年1月9日 102(e)1998年1月9日PCT PCT 1996年7月29日PCT公布。 出版物WO97 / 05742 日期1997年2月13日包括光子检测器(14)阵列的热感测系统(10)产生对照射的检测器相关响应。 单个检测器特性的变化产生固定模式噪声,降低图像或其他响应。 可切换镜(M1)可以在从发光二极管(20)到检测器阵列(14)的一个位置(Pcal)的直接红外辐射。 二极管(20)都是负极和正极的发光发射器,所发射的电流被电流控制在相当于在比环境温度更冷和更热的温度范围内的黑体辐射。 对于每个检测器导出包括将入射强度与信号响应相关联的传递函数的校准关系。 或者,反射镜(M1)可以在观察位置(Pobs)处,并且来自远程场景的红外辐射到达检测器阵列(14)。 所得到的检测器信号使用先前导出的各个校准关系转换成校正通量,并且获得具有降低的固定模式噪声的图像或响应。