Abstract:
Systems and methods for controlling fluids in microfluidic systems are generally described. In some embodiments, control of fluids involves the use of feedback from one or more processes or events taking place in the microfluidic system. For instance, a detector may detect one or more fluids at a measurement zone of a microfluidic system and one or more signals, or a pattern of signals, may be generated corresponding to the fluid(s). In some cases, the signal or pattern of signals may correspond to an intensity, a duration, a position in time relative to a second position in time or relative to another process, and/or an average time period between events. Using this data, a control system may determine whether to modulate subsequent fluid flow in the microfluidic system. In some embodiments, these and other methods can be used to conduct quality control to determine abnormalities in operation of the microfluidic system.
Abstract:
A blood purification instrument for extracorporeally circulating a patient's blood and a concentration detector detects a concentration of liquid during blood purification wherein the concentration detector has a light emitter irradiating light onto the liquid, a light receiver receives the light as transmitted through the liquid, a reference light receiver receives reference light branched from the light emitter without transmission through the liquid, and a detector detecting the light intensity respectively of the transmitted light and the reference light received by the light receiver and the reference light receiver, respectively. The blood purification apparatus further includes an error corrector detecting the concentration of the liquid based on the received light intensity of the light received by the light receiver and detected by the detector and for correcting a detected error of the concentration detector based on the received light intensity of the reference light received by the reference light receiver.
Abstract:
A light emission system that comprises a light source that comprises at least one light emitting diode (LED) that provides ultraviolet light. The system also comprises a controller that controls the intensity of the ultraviolet light provided by the light source such that the ultraviolet light provided by the light source simulates a vehicle exhaust plume.
Abstract:
A device for measuring the mass of solids contained in a fluid with light. The device includes at least two pairs of light transmitters arranged crosswise. The light transmitters in each pair are able to, at the same time, transmit pulses of light with a certain wavelength, where the wavelengths of the pairs of transmitters are different from each other. The device further includes at least one detector that is able to detect light pulses reflected from the solids as a result of the transmitted light pulses. The detected light pulses are processed to obtain a measurement of the mass of the solids contained in the fluid.
Abstract:
The invention is directed to an apparatus for optically evaluating colorimetric coloration zones automatically wherein not only a single testing tube but also a plurality of reaction zones applied one behind the other to a common carrier can be evaluated. The least quantity of indicator substances for the coloration zones is used and an adequate signal intensity with the least possible consumption of power for the optical signal evaluation is attained. At the same time, the sensitivity to faults is reduced. Such an apparatus includes transmission as well as receiving units on a common mounting carrier. The light of the transmitting unit is conducted via a light conductor through the region of the reagent carrier which is transmittent and the coloration of the channel-shaped reaction zones of the carrier is detected in transmission and reflectance.
Abstract:
A near-infrared quantitative analysis instrument for measuring a constituent of a sample material is disclosed which effectively utilizes energy in the 1200 to 1800 nanometer wavelengths regions by isolating and employing harmonic wavelengths emitted by typical, low cost commercially available light emitting diodes (LEDs) or infrared emitting diodes (IREDs). The analysis instrument utilizes these very desirable wavelength regions for quantitative analysis measurements by interposing suitable narrow bandpass filters which permit passage of only the selected harmonic wavelengths.
Abstract:
An optoelectric detector having transparent tubes separated by a thin opaque barrier with LEDs in one tube adjacent one side of the barrier and a photoconductor in the other tube adjacent to the opposite side of the barrier. The LEDs and photoconductor being in close proximity with the photoconductor with the photoconductor only receiving light emitted by the LEDs which is reflected from the solids in medium in which the detector is used.
Abstract:
A densitometer includes a light source positioned to project light rays to a test surface. A photodetector is positioned to receive light rays from the surface, and has an output which is characteristic of the amount of light received. The densitometer includes a voltage source and a photodetector which generates an output signal which is a function of a measured density and of the voltage of the source. A log amp produces a signal which is substantially proportional to the ratio of the output of the photodetector and a second output signal which is also a function of the voltage of the source.
Abstract:
A method and means for generating synthetic spectra allowing quantitative measurement utilizes dual chip alternatively energized IREDs with optical bandpass filter(s) passing two optical bands which could be combined with curvilinear interpolation to be utilized in a low cost small size quantitative measuring instrument.