Abstract:
Provided is a microscopic Raman device including: a first laser light source that generates a first laser light; a second laser light source that generates a second laser light having a wavelength different from a wavelength of the first laser light; a first optical element; a second optical element; a third optical element; a fourth optical element; and a spectrometer. When the first laser light is reflected by the first optical element and passes through the third optical element to irradiate a sample, a first Raman scattered light is generated from the sample. When the second laser light is sequentially reflected by the second optical element, the fourth optical element, and the third optical element to irradiate the sample, a second Raman scattered light is generated from the sample. The first Raman scattered light passes through the third optical element and the first optical element to enter the spectrometer.
Abstract:
A shutter assembly includes a first shutter blade having a first toothed arm extending therefrom and a first light transmitting aperture therein, and a second shutter blade positioned adjacent and parallel to the first shutter blade. The second shutter blade has a second toothed arm extending therefrom and a second light transmitting aperture therein. The first and second shutter blades are supported to allow parallel linear motion. A motor gear is disposed between, and meshed with, the first and second toothed arms such that rotation of the gear causes the first and second shutter blades to move linearly in opposite directions between an open position in which the first and second light transmitting apertures are in an overlapping relationship with respect to one another, and a closed position in which the first and second light transmitting apertures are in a non-overlapping relationship with respect to one another.
Abstract:
An automated shutter for dark acclimating a sample, comprising a base and a head mounted to the base and movable between an open and closed position. The automated shutter further comprises one or more artificial light sources and one or more optical detectors disposed in said head or base, and wherein the head is contiguous with the sample when moved into the closed position. Another embodiment comprises an enclosure placed over a sample to be dark acclimatised, with one or more artificial light sources and optical detectors disposed within or closely adjacent to said enclosure which is configured to be transformed between an optically transparent state and an optically opaque state.
Abstract:
Light photon detecting apparatus (10) comprises a photomultiplier tube (36) in a two-part housing (14), the underside (22) of which is open. The underside (22) is fitted with an elastomeric sealing ring (28) to make an airtight and hence light-tight seal with a surface (12). Two spring-loaded part (16, 18) of the housing (14) act as a pump to produce a partial vacuum which opens a shutter (60) to expose the photomultiplier tube (36).
Abstract:
A fluorometric analyzer includes a head assembly wherein the photomultiplier tube and excitation lamp of the analyzer are received in respective cavities and a transparent test cell is provided to receive a liquid sample. A first optical passage is provided between the lamp cavity and the test cell, and a second optical passage at right angles to the first optical passage is provided between the test cell and the photomultiplier tube cavity. A manually rotatable shutter assembly concentrically disposed about the test cell includes apertures for allowing light to pass through the optical passages when the shutter is rotated to a first position, and for simultaneously blocking the passage of light through the passageways when the shutter is rotated to a second position. Rotation of the shutter is limited by a first guide pin, and a second guide pin provides a desired degree of friction between the shutter assembly and the head assembly housing.
Abstract:
The invention relates to a method for detecting particles in a liquid sample. A stroboscopic principle is applied to image the particle and to provide an optical sectioning of the particles. The method has a large variety of applications such as live monitoring of e.g. the amount of microorganisms, such as bacteria, in water samples from waterworks.