Abstract:
A dual wavelength optical sensor for measuring the optical characteristics of sensing films which are responsive to a particular quantity to be measured. The optical sensor includes a light source (16, 18) for producing light outputs at two distinct wavelengths and transmitting twin components of light to first and second outputs. A time-shared optical fiber (26) receives the two distinct wavelengths of light from the first output and carries the light on a time-shared basis to a sensor probe (14). A sample detector (30) receives the two distinct wavelengths of light transmitted from the thin sensing film. A reference detector (34) receives the two distinct wavelengths of light from the second output and monitors the output intensity of the light source. A signal processing system (35) combines the measurements of the optical characteristics of the thin sensing film in response to each of the two distinct wavelengths to provide measurements which account for changes in the optical properties of the thin sensing film.
Abstract:
A device (1) for photoelectrically sensing the color of an object (18) includes a plurality of light emitting diodes (4, 6, 8) emitting light in a narrow range of wavelengths and where the light is transmitted through a corresponding fiber optic bundle (10, 12, 14) with a diameter in proportion to the transmission loss of the bundle and in inverse proportion to the emitted light energy of the corresponding light emitting diode and in proportion to the spectral response of a receiving photodiode (24). A receiving section (22) utilizes a PIN type photodiode (24) with an input section (40) that matches the shape of a receiving optical fiber bundle termination (42) where the photodiode (24) converts the reflected light from the object (18) into electrical signals which are then processed by a microprocessor (28) which also controls the activation of the light emitting diodes (4, 6, 8) and outputs a signal indicative of the color of the object (18).
Abstract:
A soil test apparatus for field use comprises structure adapting the apparatus for transport over a field for testing the soil thereof; an infrared radiation generator (20) for producing infrared radiation at a plurality of predetermined wavelengths, an elongate light carrying member (24) coupled to the infrared radiation generator and extending therefrom for directing infrared radiation onto the soil; and a light detector (26) for detecting infrared radiation reflected from the soil and for producing corresponding electrical signals.
Abstract:
The fibre optic interrogation system comprises a plurality of collection fibres. A first end of each collection fibre is arranged to collect radiation from a particular zone and the second, opposite ends of the collection fibres are arranged in a pattern that permits such second ends to be interrogated individually for radiation transmission by the relevant collection fibre. Those collection fibres which have their first ends adjacent to one another have their second ends in non-adjacent positions in the pattern. The system finds application inter alia in diamond sorting.
Abstract:
The system for sensing ions in aqueous solution such as an electroplating bath includes a light source (18) which delivers light including a selected wavelength through a series of optical fibers (20, 24, 26, 32) to probe (14). The probe is partially immersed in the solution (12) and the light is delivered through the solution in the space (94) between prisms (82, 92). The return light is conducted by optical fibers (32, 38) to detector or opto-electronic transducer (44). A portion of the original light is diverted by splitter (22) through fiber (42) to opto-electronic transducer (46) so that a comparison of the signals determines the amount of light in selected wavelength is absorbed in the solution due to ions thereon. The signal processing unit (40) is preferably enclosed in an electromagnetic protected area (16) to avoid the adverse EMI and corrosive atmosphere effects near the electroplating tank (10).
Abstract:
Le procédé décrit consiste à transmettre une énergie rayonnante vers un élément sonde comportant une surface réfléchissante conique interne et une chambre pour échantillons fluides. Les parties de la lumière qui ont été transmises, partiellement atténuées, ou diffusées par un échantillon fluide dans la chambre pour échantillons sont dirigées par au moins une partie de la surface réfléchissante conique interne vers un organe destiné à recueillir la lumière transmise partiellement atténuée, ou diffusée. Un clapet de distillation incorporé dans l'élément sonde permet d'éliminer les bulles de gaz entraînées contenues dans la chambre. Dans une application spécifique de cette sonde, un analyseur à titrage est combiné avec des circuits de conversion et de traitement de signaux électro-optiques et avec une sonde selon l'invention, pour permettre une détermination colorimétrique par titrage des points terminaux en vue de mesurer la teneur en acides gras libres d'un fluide tel qu'une huile ou une graisse comestibles.
Abstract:
Il est proposé un dispositif pour mesurer la composition de fluides, en particulier des constituants de gaz d'échappement de moteurs à combustion interne, où le gaz d'échappement à mesurer est traversé par un rayon lumineux (32, 31) sur une distance de mesure (29) et où le gaz d'échappement est plus ou moins affaibli ou modifié suivant la teneur en constituants. Le signal lumineux récepteur est avantageusement capté par un récepteur de lumière de la distance de mesure (18), lequel est étanche à la source de lumière (14) émettant la lumière, et le signal est analysé dans un circuit d'évaluation (26) relativement à l'émission de lumière initiale. De cette façon on obtient d'une manière simple un renseignement précis sur la turbidité du gaz d'échappement ou sur la proportion de charge d'un fluide ou d'un gaz avec des constituants optiquement actifs.
Abstract:
In a method and apparatus for measuring a molecular weight distribution of polymers by high speed liquid chromatography analysis, the present invention heats a sample passing through a cell portion (1) to a temperature that does not cause deposition of the sample by use of a temperature controller (8), connects a spectro-detector consisting of a light source (10) and an optical detection portion (11) to the cell portion (1) by optical transmission means (13, 14) such as an optical fiber and measures transmission light through the sample in the absence of temperature influences from the cell portion and/or the sample. Thus, the invention can analyze easily and accurately a sample having a high melting point.