Abstract:
There is disclosed a device capable of continuously measuring the presence and concentration of an analyte or analytes and a method for using said device in a liquid and/or a gas phase reaction volume. The inventive device comprises a sensor probe, a reservoir, and a detector. The inventive device delivers reagent to the sensor probe in a flow method to directly and continuously renew reagent, thereby allowing the continuous measurement of the presence and the concentration of an analyte or analytes.
Abstract:
A conical illuminator for use in colorimetry, spectrophotometry, densitometry or sensitometry. In a preferred embodiment, light from a source such as a pulsed xenon lamp is integrated within a integrating chamber. The light source may be placed in a second integrating chamber adjacent to the aforementioned integrating chamber. Alternatively, the lamp may be placed directly within the integrating chamber. The light is emitted through an exit port and conformed to a conical configuration, according to a pre-selected standard, via an annular stop. An imaging optic relays the conformed light uniformly onto a sample plane. The annular stop is placed at or near the tangential focal length of the imaging optic. The annular stop may be coated with a light absorbing coating, or can be formed with a grooved or mirrored surface. Alternatively, in lieu of an integrating chamber, a diffuser may be employed for homogenizing the light. Various configurations of the imaging optic and annular stop are possible.
Abstract:
The invention is concerned with a method for manufacturing a channel device, especially for recordings of thermal conductivity, viscosity, density, dielectric constants, refractive indices, etc. of materials such as fluids and gases (called samples), where the material under investigation is guided through a measuring channel with at least one sensor and at least one inlet and one outlet orifice for the sample. The invention also concerns the fabrication procedure of the channel device, especially the recording unit for determining the thermal conductivit, viscosity, density, dielectric constant, etc. of samples where the material under investigation is passed through or brought into a measuring channel which is equipped with sensors and actuators.
Abstract:
A sensor for gases or ions with a light source, a detector and a sensor layer all of which are attached to a carrier. A thin sensor film, the absorptivity of which changes through the action of the measurement medium, is arranged on a light waveguide, the one flat side of which covers a flat end face of the light source, the end face of the carrier and a plane receiving surface of the detector. Thus, a sensitive sensor, especially for gases, is obtained in which the sensor layer, the light source and the detector form an integrated structural unit.