公开(公告)号：US5386295A

公开(公告)日：1995-01-31

申请号：US005321

申请日：1993-01-15

Applicant: Steven C. Switalski ,  David S. Uerz ,  Alan J. Lowne ,  James R. Sandifer ,  Hsue-Yang Liu

Inventor： Steven C. Switalski ,  David S. Uerz ,  Alan J. Lowne ,  James R. Sandifer ,  Hsue-Yang Liu

IPC: G01J1/44 ,  G01J3/08 ,  G01J3/28 ,  G01J3/51 ,  G01N21/31 ,  G01N21/35 ,  G02B26/04 ,  G01J3/02 ,  G01N21/64 ,  G01N21/65

CPC classification number: G01J3/42 ,  G01J3/02 ,  G01J3/0218 ,  G01J3/0232 ,  G01J3/0235 ,  G01J3/0289 ,  G01J3/08 ,  G01J3/44 ,  G01N21/314 ,  G02B26/04 ,  G01J2001/4242 ,  G01J2003/1213 ,  G01J2003/2866 ,  G01N2021/3133 ,  G01N2021/3159 ,  G01N2021/3174 ,  G01N2021/4742 ,  G01N21/359 ,  G01N2201/0826 ,  G01N2201/1283

Abstract: A postacquired spectrophotometer, for use with a sample and reference. The spectrophotometer has a filter unit, defining an axis of movement, and pluralities of designated sites and dark sites disposed in uniform relation to the axis. The designated and dark sites are disposed in alternation. Alternating designated sites have apertures and filters covering the apertures. Further, a main member, coaxial with the filter unit, has sample and reference beam paths, which are intersected by the sites. The main member has disposed, in operative relation to the actuators, an actuator sensor, which generates an integration actuator signal upon alignment with each integration actuator and a clamping actuator signal upon alignment with each clamping actuator. Moreover, a drive continuously moves the filter unit relative to the axis and beam paths. Further, a light distribution system directs light separately from the sample and reference to respective beam paths, and then to a detector, which produces a detector signal responsive to light received. Finally, means for processing the signals is provided, including a clamping circuit, integrators, and a demultiplexer.

Abstract translation: 一个采用分光光度计的分光光度计，用于样品和参考。 分光光度计具有限定运动轴线的过滤器单元以及与轴线均匀关系地设置的多个指定位置和暗点。 指定的和黑暗的地点交替处置。 交替指定的位置具有覆盖孔的孔和过滤器。 此外，与过滤器单元同轴的主构件具有与位置相交的样品和参考光束路径。 主构件以致动器的方式相对于致动器设置致动器传感器，其在与每个积分致动器对准时产生积分致动器信号，并且在与每个夹紧致动器对准时产生夹紧致动器信号。 此外，驱动器相对于轴和梁路连续地移动过滤单元。 此外，配光系统将光从样品分开引导并参考各个光束路径，然后引导到检测器，该检测器响应于所接收的光产生检测器信号。 最后，提供用于处理信号的装置，包括钳位电路，积分器和解复用器。

公开(公告)号：US5352963A

公开(公告)日：1994-10-04

申请号：US785553

申请日：1991-10-31

Applicant: Steven A. Garand ,  Carl P. Daniel

Inventor： Steven A. Garand ,  Carl P. Daniel

IPC: H02P8/16 ,  G01N35/00 ,  G01N35/02 ,  G01N35/04 ,  G01N35/10 ,  H02P8/00

CPC classification number: G01N35/1002 ,  G01N35/028 ,  G01N2021/1759 ,  G01N2035/00079 ,  G01N2035/00455 ,  G01N2035/042 ,  G01N2035/0425 ,  G01N2035/0463 ,  G01N2035/0475 ,  G01N2201/0407 ,  G01N2201/0446 ,  G01N2201/08 ,  G01N2201/1283 ,  G01N35/025

Abstract: An improved control system for a stepper motor coil includes a flyback circuit that dissipates coil energy slowly while the coil is energized and operated in the chopping mode, while dissipating coil energy rapidly when the coil is switched to its de-energized phase.

Abstract translation: 用于步进电动机线圈的改进的控制系统包括回扫电路，其在线圈被通电并且以斩波模式操作时缓慢地消散线圈能量，同时当线圈切换到其断电阶段时迅速消散线圈能量。

公开(公告)号：US5251006A

公开(公告)日：1993-10-05

申请号：US666139

申请日：1991-03-07

Applicant: David E. Honigs ,  Timothy G. Kelly

Inventor： David E. Honigs ,  Timothy G. Kelly

IPC: G01J3/02 ,  G01J3/28 ,  G01J3/42 ,  G01N21/27 ,  G01J3/06 ,  G01J3/18

CPC classification number: G01N21/274 ,  G01J3/28 ,  G01J2003/2879 ,  G01J3/42 ,  G01N2201/1283

Abstract: In a spectrophotometer having an oscillating grating, an automatic calibration system is provided to ensure that the instrument constants are recomputed before each measurement of an unknown sample. In the system, whenever a reference scan is carried out, a second scan through an absorbance standard is carried out automatically and the data obtained is used to correct the instrument coefficients relating the angular position of the grating to the wavelength. The corrected coefficients are then stored to be used in the measurement of the unknown sample immediately thereafter. For near infrared spectrum measurements, the absorbance standard is a polystyrene plate. For visual measurements, the absorbance standard is a didymium plate. The didymium plate is mounted on the polystyrene plates eclipse a portion of the polystyrene plate.

公开(公告)号：US4549080A

公开(公告)日：1985-10-22

申请号：US505387

申请日：1983-06-17

Applicant: Lowell L. Baskins ,  James M. Keene ,  John G. Montfort

Inventor： Lowell L. Baskins ,  James M. Keene ,  John G. Montfort

IPC: G01J1/02 ,  G01J1/18 ,  G01J1/44 ,  G01N21/03 ,  G01N21/35 ,  G01N21/53 ,  G01J1/00

CPC classification number: G01N21/3504 ,  G01J2001/182 ,  G01J2001/4242 ,  G01N2021/536 ,  G01N21/0332 ,  G01N2201/0216 ,  G01N2201/1245 ,  G01N2201/1283

Abstract: A mixture of H.sub.2 O, CO.sub.2 and CO are measured in the same sample chamber by infrared radiation passing through the chamber and absorption filters passing a narrow band in their respective absorption curves to an infrared detector. Background radiation is zeroed by grounding the detector response when an opaque segment is disposed in the path. A reference filter detects drift which is automatically corrected.

Abstract translation: 通过红外辐射通过室和吸收滤光片在相同的样品室中测量H 2 O，CO 2和CO的混合物，吸收滤光片通过其各自的吸收曲线中的窄带到红外检测器。 当不透明段设置在路径中时，通过将检测器响应接地来对背景辐射进行归零。 参考滤波器检测自动校正的漂移。

公开(公告)号：US4037970A

公开(公告)日：1977-07-26

申请号：US653848

申请日：1976-01-30

Applicant: Donald R. Webster ,  Eugene R. Ganssle

Inventor： Donald R. Webster ,  Eugene R. Ganssle

IPC: G01J1/18 ,  G01J3/12 ,  G01J3/28 ,  G01N21/31 ,  G01N21/35 ,  G01N33/10 ,  G01J3/48

CPC classification number: G01N21/314 ,  G01N33/10 ,  G01J2001/182 ,  G01J2003/1243 ,  G01J2003/2866 ,  G01N2021/3129 ,  G01N2021/3159 ,  G01N2021/4769 ,  G01N21/35 ,  G01N21/3563 ,  G01N21/4738 ,  G01N2201/1283

Abstract: An automatic test instrument for gaging the percentage of various constituents in organic substances by comparing the reflective optical density of the subject at various wavelengths. Narrow band optical filters are connected together in the form of a rotatable paddle wheel positioned so that the filters can be individually swept through the incident light path between the specimen and wideband light source. As the filter wheel turns, the band of light passed by each filter is progressively shifted with the changing angle of the filter relative to the light path. The filter wheel configuration includes opaque vanes extending from the ends of the filters to periodically interrupt the passage of light to the specimen. Photocells are positioned to sense the level of light reflected from the specimen. The output of the photocells is sampled at predetermined times relative to the rotation of the filter wheel to yield values indicative of reflected intensity at certain wavelengths. Using these values, an electronic circuit in one embodiment calculates three optical density difference values corresponding to moisture, protein and oil content of the specimen. The difference values are automatically inserted in three linear equations which are solved to obtain readings representing the true percentages of oil, water and protein contained in the specimen. Each time a new specimen is loaded for testing, the instrument is automatically calibrated against a standard sample, preferably Teflon (Trademark). The output of the photocells is amplified in a special circuit which subtracts the level of dark period current from the output when the photocells are illuminated.