公开(公告)号：CA1220050A

公开(公告)日：1987-04-07

申请号：CA462772

申请日：1984-09-10

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G01J3/12 ,  G01N21/35 ,  G01N21/55 ,  G01N21/86 ,  G01N33/34 ,  G01N21/47 ,  G01N21/49

Abstract: Monochromatic infrared radiation of variable wavelengths between 1.0 and 3.5 microns is directed upon a portion of a moving web, and the spectra of infrared radiation reflected from the web portion and of radiation transmitted through the web portion are separately measured by sensors located on both sides of the web. These spectra are combined to provide an absorption spectrum insensitive to any elastic scattering that is also present. Measures of the contents of the web constituents are generated by least-square fitting the individual absorption spectra of the constituents to the measured absorption spectrum of the web. Means for calibrating the reflectance and transmittance measurements and for keeping the sensor viewing windows free of dirt and dust are also disclosed.

公开(公告)号：FI71201B

公开(公告)日：1986-08-14

申请号：FI773457

申请日：1977-11-16

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G01N21/35 ,  G01N21/31 ,  G01N21/59 ,  G01N21/25

公开(公告)号：CA1046609A

公开(公告)日：1979-01-16

申请号：CA234457

申请日：1975-08-29

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G05D11/00

Abstract: In a multi-stage bleaching system in which respective bleaching chemicals are added to the stock in various stages, apparatus in which in the first stage in which chlorine is added to the brown stock, the first of a pair of sensing units associated with the stage comprises a source of red light directed onto the incoming brown stock and a suitable detector for sensing light scattered from the stock to produce a first signal representative of the brightness of the incoming stock and the second similar sensing unit of the pair senses the brightness of the stock immediately following the addition of chlorine to produce a second signal. The first and second signals are compared to produce a difference signal indicative of the change in brightness independently of the condition of the incoming stock and this difference signal is compared with a set point standard to provide a control signal for regulating the addition of the chlorine to the brown stock.

公开(公告)号：CA1196512A

公开(公告)日：1985-11-12

申请号：CA438862

申请日：1983-10-12

Applicant: SENTROL SYSTEMS LTD

Inventor： RIGGIN MICHAEL T ,  MACTAGGART JOHN W

IPC: G01N21/35 ,  G01N21/27

Abstract: Apparatus for measuring the moisture content of a moving web in which radiation from a source located at a point remote from the web is conveyed by a plurality of light pipes to a plurality of transmitting ports arranged across the surface of the web in a direction generally perpendicular to the direction of travel of the web. A plurality of receiving ports arranged in alignment with the transmitting ports collect radiation either reflected from or transmitted through the web. A second set of light pipes convey the collected radiation to a photodetector array located at a point remote from the web. The photodetector is monitored by a microprocessor control system which provides an indication of the moisture content of the web.

公开(公告)号：GB2147413A

公开(公告)日：1985-05-09

申请号：GB8423777

申请日：1984-09-20

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G01J3/12 ,  G01N21/35 ,  G01N21/55 ,  G01N21/86 ,  G01N33/34 ,  G01N21/47 ,  G01N21/49 ,  G01N21/59

Abstract: Monochromatic infrared radiation of variable wavelengths between 1.0 and 3.5 microns is directed upon a portion of a moving web, and the spectra of infrared radiation reflected from the web portion and of radiation transmitted through the web portion are separately measured by sensors located on both sides of the web. These spectra are combined to provide an absorption spectrum insensitive to any elastic scattering that is also present. Measures of the contents of the web constituents are generated by least-square fitting the individual absorption spectra of the constituents to the measured absorption spectrum of the web. Means for calibrating the reflectance and transmittance measurements and for keeping the sensor viewing windows free of dirt and dust are also disclosed.

公开(公告)号：DE3339435A1

公开(公告)日：1984-05-03

申请号：DE3339435

申请日：1983-10-29

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G01J3/50 ,  G01N21/86 ,  G01N21/89

Abstract: Apparatus for measuring the color, brightness and opacity of a moving web in which light from a plurality of sources is directed towards and through a moving web. Light reflected from the surface of the web is conveyed by a plurality of light pipes to a first photodetector array located at a point remote from the web. A circular variable bandpass filter varies the wavelength of the radiation reaching the detector substantially continuously through the optical spectrum to produce a detector output which periodically scans the optical spectrum. The detector outputs at various wavelengths are weighted by a microcomputer to produce brightness and X, Y and Z tristimulus values. Light transmitted through the web is conveyed by a plurality of light pipes to a second photodetector array also located at a point remote from the web. The photodetector is also monitored by the microcomputer to provide an indication of the opacity of the web.

公开(公告)号：FI71201C

公开(公告)日：1986-11-24

申请号：FI773457

申请日：1977-11-16

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G01N21/35 ,  G01N21/31 ,  G01N21/59 ,  G01N21/25

公开(公告)号：CA1169140A

公开(公告)日：1984-06-12

申请号：CA398458

申请日：1982-03-16

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: D06B23/26 ,  G01J3/12 ,  G01J3/46 ,  G01N21/86 ,  B05C11/10 ,  D06P5/00

Abstract: Apparatus for measuring and controlling the color of a moving web in which a circular variable bandpass filter having a passband varying substantially continuously with angular displacement through the optical spectrum is interposed in the optical path between the web and a detector and is rotated to produce a detector output which periodically scans the optical spectrum. In one disclosed embodiment, the detector outputs at the various wavelengths are weighted to produce X, Y and Z tristimulus values while, in another disclosed embodiment, dye flows are so controlled as to minimize the total square error between the measured reflectance spectrum and the desired reflectance spectrum.

公开(公告)号：NO820655A

公开(公告)日：1982-09-06

申请号：NO820655

申请日：1982-03-02

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G05D21/00 ,  D06B23/26 ,  G01J3/46 ,  G01J3/50 ,  G05D21/02 ,  G01N ,  G02F

CPC classification number: G01J3/50 ,  G01J3/0251 ,  G01J3/463 ,  G01J3/465 ,  G01J3/51 ,  G01J2003/467

公开(公告)号：FI820597L

公开(公告)日：1982-09-04

申请号：FI820597

申请日：1982-02-23

Applicant: SENTROL SYSTEMS LTD

Inventor： MACTAGGART JOHN W

IPC: G05D21/00 ,  D06B23/26 ,  G01J3/46 ,  G01J3/50 ,  G05D21/02 ,  G05B

Abstract: Apparatus for measuring and controlling the color of a moving web in which a circular variable bandpass filter having a passband varying substantially continuously with angular displacement through the optical spectrum is interposed in the optical path between the web and a detector and is rotated to produce a detector output which periodically scans the optical spectrum. In one disclosed embodiment, the detector outputs at the various wavelengths are weighted to produce X, Y and Z tristimulus values while, in another disclosed embodiment, dye flows are so controlled as to minimize the total square error between the measured reflectance spectrum and the desired reflectance spectrum.