公开(公告)号：US4652761A

公开(公告)日：1987-03-24

申请号：US677950

申请日：1984-12-04

Applicant: James B. Kerr ,  Charles T. McElroy ,  David I. Wardle

Inventor： James B. Kerr ,  Charles T. McElroy ,  David I. Wardle

IPC: G01J3/06 ,  G01J3/18 ,  G01J3/28 ,  G01J3/32

CPC classification number: G01J3/32 ,  G01J2003/063 ,  G01J2003/2866 ,  G01J2003/2876 ,  G01J2003/326 ,  G01J3/0202 ,  G01J3/0229 ,  G01J3/0291 ,  G01J3/1838

Abstract: A holographic grating spectrophotometer for detecting ozone and sulphur dioxide in the atmosphere is described which provides automatic calibration and which provides automatic linearity correction for the photomultiplier tube. Automatic calibration is provided by using a computer to control a stepper motor to move the grating so that the photomultiplier tube receives maximum intensity at the calibration wavelength of 302.1 nm from a mercury source. Automatic linearity correction is obtained by cycling a wavelength selection mask across exit slits located in the focal plane of the device and firstly combines separately taken counts of two different wavelengths and comparing this sum with the sum of counts of these wavelengths taken simultaneously. The difference is used to calculate photomultiplier tube deadtime and improve accuracy of the results. In a preferred embodiment five wavelengths are used to calculate ozone and sulphur dioxide levels, and a stepper motor driving a cylindrical wavelength selection mask permits exit slits to be exposed to predetermined wavelengths one at a time.

Abstract translation: 描述了用于检测大气中的臭氧和二氧化硫的全息光栅分光光度计，其提供自动校准，并且为光电倍增管提供自动线性校正。 通过使用计算机来控制步进电机来移动光栅来提供自动校准，使得光电倍增管在距离汞源的302.1nm的校准波长处接收最大强度。 通过将波长选择掩模穿过位于器件的焦平面中的出口狭缝来获得自动线性校正，并且首先将分离的两个不同波长的计数组合并将该和与同时采用的这些波长的计数之和进行比较。 差异用于计算光电倍增管死区时间，提高结果精度。 在优选实施例中，使用五个波长来计算臭氧和二氧化硫水平，并且驱动圆柱形波长选择掩模的步进电机允许出口狭缝一次暴露于预定波长。

公开(公告)号：US20180073923A1

公开(公告)日：2018-03-15

申请号：US15677606

申请日：2017-08-15

Applicant: Otsuka Electronics Co., Ltd.

Inventor： Nobuyuki INOUE ,  Taku NAGASHIMA

IPC: G01J3/02 ,  G01N21/359

CPC classification number: G01J3/027 ,  G01J3/0218 ,  G01J3/0221 ,  G01J3/0264 ,  G01J3/28 ,  G01J3/2803 ,  G01J2003/2876 ,  G01N21/274 ,  G01N21/359

Abstract: There is provided an optical measurement method using a detector having a detection sensitivity to at least a near-infrared region. The optical measurement method including: obtaining an output value by measuring a light sample at any exposure time with the detector; and correcting the output value with an amount of correction corresponding to the output value, when the exposure time at which the output value is obtained is within a second range. The amount of correction includes a product of a coefficient and a square of the exposure time, the coefficient indicating a degree to which an output value obtained when the light sample is measured with the detector at an exposure time within the second range deviates from output linearity obtained when the light sample is measured with the detector at an exposure time within a first range.

公开(公告)号：US20180058927A1

公开(公告)日：2018-03-01

申请号：US15560493

申请日：2015-03-24

Applicant: Otsuka Electronics Co., Ltd.

Inventor： Hisashi SHIRAIWA ,  Hiroyuki SANO

IPC: G01J1/44 ,  G01J1/08 ,  G01J1/04

CPC classification number: G01J1/44 ,  G01J1/0295 ,  G01J1/0407 ,  G01J1/08 ,  G01J3/02 ,  G01J3/0297 ,  G01J3/10 ,  G01J3/28 ,  G01J2001/0481 ,  G01J2001/083 ,  G01J2001/086 ,  G01J2001/444 ,  G01J2003/2866 ,  G01J2003/2876

Abstract: A reference light source device for calibration of a spectral radiance meter includes an integrating sphere having a radiance reference plane, which is an opening; and a plurality of first optical ports, which are formed apart from each other in an outer wall of the integrating sphere to allow light rays with equivalent wavelength characteristics to enter an interior of the integrating sphere.

公开(公告)号：US4997280A

公开(公告)日：1991-03-05

申请号：US413063

申请日：1989-09-27

Applicant: Karl Norris

Inventor： Karl Norris

IPC: G01J3/02 ,  G01J3/28 ,  G01J3/433

CPC classification number: G01J3/2889 ,  G01J2003/2866 ,  G01J2003/2876 ,  G01J3/433 ,  G01N21/4738

Abstract: In a spectrophotometric instrument, a system is provided to correct for distortion caused by rapid scanning of the spectrum. In the instrument, photodetectors detect light energy which is scanned through a spectrum at a rapid rate. An amplifier amplifies the output signal generated by the photodetectors. The output signal of the amplifier is sampled at increments and the samples are converted to digital values. A first derivative is determined from the digital values by subtracting from each value the value from the preceding increment. The first derivative values are multiplied times a constant selected to correct for the distortion and the resulting product values are added to the amplitude digital values to provide a set of corrected values representing the intensity detected by the photodetectors.