Abstract:
A vertical beam spectrophotometer for measuring the light absorption of an assay prepared using standard wet chemistry procedures and conventional solid phase coated bead technology is disclosed. The spectrophotometer measures the absorption of the assay in a conventional reaction cuvette with the bead remaining in the cuvette. The light source of the spectrophotometer illuminates the bead, which diffuses the light into the surrounding assay solution. A lense projects the diffused light onto a photocell which converts it into an electrical signal having magnitude related to the light absorption of the assay. The signal is processed in a known manner by conventional processing circuitry to obtain an absorption value.
Abstract:
Endotoxin contents in samples can be determined qualitatively or quantitatively, singly or in parallel, with high precision in a short time by a process comprising applying a light to each sample solution, measuring an initial transmitted light amount I₀ and a transmitted light amount at a time t, I(t), to give a ratio R(t) = I(t)/I₀, and judging a gelation point by a threshold value of R(t), or further obtaining a gelation time from the gelation point. An apparataus used therefor is also disclosed.
Abstract:
57 Endotoxin contents in samples can be determined qualitatively or quantitatively, singly or in parallel, with high precision in a short time by a process comprising applying a light to each sample solution, measuring an initial transmitted light amount l o and a transmitted light amount at a time t, I(t), to give a ratio R(t) = l(t)/l o , and judging a gelation point by a threshold value of R(t), or further obtaining a gelation time from the gelation point. An apparatus used therefore is also disclosed.
Abstract:
Apparatus for measuring light scattering of a sample comprising a light beam source, means for collimating the beam and making it impinge on the sample in a perpendicular direction, at least one light sensor, and at least one spatial filter between the sample and the optical sensor, provided with two apertures, means for measuring the total power reaching the sensor and means for measuring the power of beams with a low k vector after the beam traverses the filter. The invention provides thus a simplified, portable and compact device for measuring different parameters like haze, turbidity, etc. can be built, for any sample and without the need of changing detectors.
Abstract:
The invention relates to a measuring device for luminescence measurement comprising a sample carrier (8) for receiving a luminescent sample (9), a first lens array (13) having numerous lenses (14) arranged in a grid-shaped fashion and serving for focusing luminescent radiation emerging from the luminescent sample (9), and comprising a light sensor (16) for detecting the luminescent radiation emitted by the luminescent sample (9), wherein the light sensor (16) is arranged downstream of the first lens array (13) in the beam path of the luminescent radiation. It is proposed that the first lens array (13) is a first microlens array (13) having numerous microlenses (14), wherein a first perforated mask (11) having numerous holes (12) is arranged in the beam path of the luminescent radiation between the sample carrier (8) and the first microlens array (13), wherein the individual microlenses (14) and the holes (12) are assigned to one another and have corresponding axes. The sample carrier (8) can have a substantially planar waveguide (8), wherein the excitation radiation from an illumination unit (1) is coupled into a waveguide edge (10) of the waveguide (8).
Abstract:
A tip for use in an optical detection system to analyze an analyte in a fluid sample drawn into the tip, using light reflected from a detection surface inside the tip that the analyte binds to, comprising a first detection surface and a second detection surface located in a same flow path with no controllable valve separating them, wherein the first and second detection surfaces have different surface chemistries.
Abstract:
A system and method for multimode imaging of at least one sample is disclosed. The system includes at least one light source; an optical system selected responsive to a mode of operation of the imaging system; and a detector capable of selective reading of pixels. The at least one sample is moved relative to the optical system using a sample movement technique selected from the group consisting of step sample moving and continuous sample moving. The method includes the steps of (1) selecting a mode of operation for the imaging system; (2) transmitting light from at least one light source through an optical system selected in response to the mode of operation for the imaging system; (3) moving the at least one sample relative to the optical system using a sample movement technique selected from the group consisting of step sample moving and continuous sample moving; and (4) selectively reading pixels with a detector.
Abstract:
A multi-channel fluorescence measuring optical system and a multi-channel fluorescence sample analyzer using the optical system are provided. The multi-channel fluorescence measuring optical system, which irradiates light onto a plurality of sample channels and detecting fluorescence radiated from samples, includes: a light source (60a-d); an integrator (70) for giving the light irradiated from the light source a uniform intensity distribution; a sample holder (80) having a plurality of sample channels on which the samples (m) are mounted, wherein the samples are exited by the light emitted from the integrator; and a beam splitter (75) between the integrator and the sample holder for dividing the incident light in a predetermined ratio. Since the light intensities of fluorescence images are detected using optical fiber bundles (85a-d) and photodiodes (89a-d), the manufacturing cost can be greatly reduced, and the optical system can be miniaturized.