1
Richard D McLachlan, Gary L Jewett, John C Evans: Fiber-optic probe for sensitive Raman analysis. The Dow Chemical Company, March 4, 1986: US04573761 (96 worldwide citation)

A fiber-optic probe, useful for light scattering and luminescence measurements, which comprises at least one optical fiber for transmitting light into a sample and at least two optical fibers for collecting light from the sample. The probe may further comprise a shield surrounding the fibers and hav ...


2
Richard D McLachlan, Leslie D Rothman: Fiber optic probe. The Dow Chemical Company, November 17, 1987: US04707134 (62 worldwide citation)

A fiber optic probe having a sealed, cylindrical housing closed at one end by a transparent window and at the opposite end by a wall through which a plurality of optical fibers extend toward the window. Adjacent the window the fibers are radially and circumferentially spaced about the axis of the ho ...


3
Richard D McLachlan, Ray W Chrisman: Method for measuring the size of objects in a fluid medium. The Dow Chemical Company, Leorman & McCulloch, September 6, 1988: US04768879 (41 worldwide citation)

A method for determining the size of moving objects present in a transparent or translucent fluid medium comprises illuminating a zone of the suspension with monochromatic light, collecting scattered light having a wavelength characteristic of the objects or of the medium, and measuring the intensit ...


4
Ray W Chrisman, Richard D McLachlan, Richard S Harner: Method for determining the onset of crystallization. The Dow Chemical Company, Learman and McCulloch, June 9, 1987: US04672218 (29 worldwide citation)

A method for determining the onset of nucleation wherein a zone of a translucent fluid in which crystals may be formed is illuminated by a beam of light. When crystallization commences the crystals in the illuminated zone reflect and scatter light. Some of the scattered light is collected and transm ...


5
Richard D McLachlan, Ray W Chrisman: Methods and apparatus for measuring the light absorbance of a fluid medium. The Dow Chemical Company, John K McCulloch, May 9, 1989: US04829186 (18 worldwide citation)

The presence and concentration of a light absorbing constituent in a fluid medium is determined in-situ by immersing in such medium a probe having a prism at one end whose refractive index is greater than that of the medium and causing light including a wavelength absorbable by such constituent to t ...


6
Richard D McLachlan, Mary A Leugers, Robert A Bredeweg: Variable path length light transmission probe. The Dow Chemical Company, John K McCulloch, Timothy S Stevens, April 12, 1994: US05303036 (16 worldwide citation)

A probe for use in situ analysis of light absorbing fluids wherein light emitted from a source is collimated by a lens and transmitted through a fluid onto and substantially perpendicular to a reflector. Light is reflected by the reflector back through the fluid and focused by the lens onto a reflec ...


7
Richard D McLachlan, Ray W Chrisman: Method for measuring the relative concentration of larger and smaller particles in suspension. The Dow Chemical Company, February 17, 1987: US04643573 (12 worldwide citation)

The concentration of larger particles in a suspension of relatively small and relatively large light scattering particles is determined by illuminating a zone of the suspension with light of such wavelength as to be scattered more efficiently by the larger particles than by the smaller particles. Th ...


8
Richard D McLachlan, Mary Anne Leugers: Apparatus for conducting Raman spectroscopy using fiber optics. The Dow Chemical Company, Timothy S Stevens, Stephen S Grace, November 6, 2001: USH0002002

A fiber optic probe apparatus useful for conducting Raman spectroscopy remotely over optical fibers with minimal interference from Raman scattering within said fibers which includes three elements. The first element is at least one transmitting optical fiber having a first end and a second end. The ...