Abstract:
An automated photometer is provided having a monochromator which generates light signals at least two controllable wavelength, for use in a dual wavelength analyzer system. Chopped light is alternately directed from two entrance slits 57 displaced from each other onto a fixed grating 60, thereby providing an alternating light source having light pulses at two defined wavelengths. The light signal is passed through one or more cuvettes 92A, 92B each containing a sample, and a photodetector 93A, 93B on the other side of the cuvette generates a periodic electrical signal representative of the absorbance of the test sample at the two defined wavelengths. An electronic processing channel 1, 2 is provided for each cuvette, adapted to process the periodic electrical signal which contains information derived at the two wavelengths and to provide output signals representative of the two absorbance values.
Abstract:
The invention provides a system having a broadband spectrometer 20 with a fiber optic reformattor 16 for field use in detecting and identifying gas clouds within a field of view. The system includes a grating type spectrometer 20, a fiber optic reformattor 16, a focal plane detector array 24 and electronics 42-52 for background signal substraction techniques for generating spectral signature data which is analyzed for gas detection and outputting a decision making signal for recognition.
Abstract:
Method and apparatus for obtaining derivatives of photometric signals in spectroscopy wherein an analogue signal characteristic of a sample (12) is converted to a digital signal which is differentiated using an approximation algorithm in a non-recursive digital filter (18) operating at predetermined differentiating intervals. The derivative is then low pass filtered in a recursive digital filter (23) at filtering intervals shorter than the differentiating intervals to reconstruct an interpolated derivative.
Abstract:
In the present equipment for spectroscopic measurement of a gas in a gas mixture, for example a gas in the atmosphere, a filter device is used to filter out one spectral line from other spectral lines belonging to other gases and the transmitted light is detected by a detector which gives a signal to devices for calculating and displaying the measurement data. The filter device consists of an interference filter (1), at least one fixed etalon (2) and a Fabry-Perot interferometer (1). In a preferred design, the filter can be fitted with two fixed etalons instead of one.
Abstract:
An inductively coupled plasma spectrometer including shielding/sampling means (1) located between a plasma torch (3) and an optical system (4) of the spectrometer, wherein said shielding/sampling (1) means is associated with an enclosure (9) for the plasma torch such that a relatively high independance path (10, 11) is established for limiting flow of electrical current between said shielding/sampling means (1) and said enclosure (9).
Abstract:
An apparatus for the calibration and quality assurance of a multichannel spectrophotometer, particularly an ELISA spectrophotometer, comprises a series of filters having a known first color and linearly increasing optical density. The response of the spectrophotometer is measured against the known color and linearly increasing optical density. Additional filters of at least one additional color permit checking the color response of the spectrophotometer. An algorithm determines whether the response conforms to predetermined conditions. An output is produced to provide a record of the calibration and quality assurance of the spectrophotometer. The invention has particular utility for conducting calibration and quality assurance of ELISA spectrophotometers used in clinical laboratory screening for infection diseases, such as Hepatitis B and the AIDS viruses.
Abstract:
A photometer adapted to receive light deflected from a microscope observation axis (15) to alternatively provide image or wavelength scanning modes. The photometer comprises an entrance axis (29) for light received from the microscope, a pin hole occluder (12) positioned at one end of the entrance axis (29), a detector axis (27) having a detector (18) at one end thereof, and first and second scanning axes (16, 28) selectively connecting the entrance axis (29). The first scanning axis (16) is provided with a first imaging means (14) positioned thereon for imaging the pin hole occluder (12 near said detector (18). The second scanning axis (28) is provided with monochromator means (32) to reflect a single wavelength of light and a second imaging means for imaging the pin hold occluder (12) near the detector (18). The photometer also includes selector means (26) for connecting a chosen scanning axis (16, 28) to said entrance and detector axes (29, 27). By means of this arrangement image scanning' can be performed when said first scanning axis (16) connects said entrance and detector axes (29, 27), and wavelength scanning can be performed when said second scanning axis (28) connects said entrance and detector axes (29, 27).
Abstract:
A spectrophotometer includes means for ensuring that the active area of a detector is always filled regardless of the resolution aperture setting of the instrument.
Abstract:
Für die Abbildung von kleinen Bereichen mit großem Öffnungswinkel werden Objektive angegeben, die aus zwei Kegelschnittkörpern (zB 1a, 1b, 6a, 6b) aus optisch isotro pen Material bestehen und bei denen die Ablenkung der Lichtstrahlen durch Totalreflektion an den Mantelflächen (zB 10, 15, 60, 65) erfolgt. Die Lichtein- und austrittsflächen sind als Kugelflächen (zB 13, 18, 63, 68) ausgebildet, deren Mittelpunkte (zB 14, 19, 64, 69) mit den Brennpunkten (zB 11, 16, 61, 66) der Kegelschnittkörper mindestens annähernd in einem Punkt vereinigt sind.
Abstract:
A spectrometer (20) is formed from two supports (10, 30). A first of the supports (10) has a diffraction grating (11) for dispersing light, source locating means (12) for locating a source of said light, and detector locating means (13) for locating a detector of said dispersed light. The other support is a mirror support (30) having a body and at least two reflective surfaces (31, 32) integrally formed with the body of the support (30). In preferred embodiments, one of the reflective surfaces may be divided into segments (32, 32'; 33). The spectrometer (20) can be cheaply mass-produced. In aspects of the invention, the distances between the source, detector and dispersive means are accurately fixed during manufacture in a simple and inexpensive manner.