Abstract:
Die Erfindung bezieht sich auf ein Zweistrahl-Interferometer zur Fourierspektroskopie, Insbesondere zur Emissionsmessung von Spurengas-Konzentrationen an Bord von Raumfahrzeugen, bei dem die optische Weglängendifferenz durch einen gleichförmigen rotierenden Exzenter (11,12), der über ein Gestänge (13,14) die lineare Auslenkung von Retroreflektoren (17,18) bewirkt, ermittelt wird. Ein terrestrischer Einsatz, etwa zur Emissionsmessung von Schornsteinen, wie auch ein Einsatz in Flugzeugen sind ebenfalls möglich. Ein Ausführungsbeispiel ist erläutert und in den Figuren der Zeichnung skizziert.
Abstract:
A photodiode array spectrometer for determining the spectral composition of a polychromatic beam of radiation comprises diffraction means (10) which generate from the polychromatic beam a diffracted beam with a plurality of spatially separated diffracted rays of different wavelengths (λ₁ ,λ₂ ,λ₃ ) . A photodiode array (11) receives the diffracted beam whereby each photodiode intercepts a different spectral portion of the beam. A rotatable transparent plate (8) is provided in the beam path in front of the diffraction means (10) which, due to refraction of the beam upon entering and leaving the plate (8), permits to vary the direction of the beam impinging on the diffraction means (10) and therefore the direction of the diffracted beam in small steps depending on the angle of rotation of the plate (8). By the stepwise displacement of the diffracted beam across the photodiode array (11) , a better sampling of the diffracted beam and therefore an improved spectral resolution is achieved. The invention can be used in the spectrometric analysis of a sample contained in a sample cell (5), whereby the sample cell is irradiated with polychromatic light from a light source (1).
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:
The invention relates on the one part to a method for measuring spectra in the course of which the intensity of the radiation to be tested is measured while varying the wavelength of the radiation. The measurement is performed either by varying the wavelength of the radiation step-by-step and keeping the product of the measuring period and the intensity detected at a constant value for each wavelength, or by varying the wavelength of the radiation continuously with a rate proportional to the momentary value of the intensity detected. The invention is on the other part an apparatus for measuring spectra comprising a device (7) for varying the wavelength of the radiation to be measured and a radiation detector (3) sensing the intensity of the radiation to be measured. In the apparatus an input (17) of a comparator (5) of adjustable threshold value is connected to an output (19) of the radiation detector (3) via an integrator (4), the output (18). of the comparator (5) is connected to the control input of the device (7) for varying the wavelength step-by-step, and there is a time measuring unit (12) for measuring the time interval necessary for the output signal of the integrator (4) to change from an initial value up to the adjustable threshold value (Figure 1).
Abstract:
A cam and follower arrangement in which the cam consists of a track (21), carried by a rotatable member (12), and has one or more abrupt directional transitions (30) and the follower (17) is biassed to engage one wall or the other (31, 32) of the track (21) appropriate to the direction of rotation of the member (12), by means including a direct-current electric motor (20) operated in a stalled condition. The arrangement is employed in a monochromator for spectrophotometric apparatus to drive a filter-holder 18, to position one of a number of optical filters (22, 23, 24, 25) in the incoming beam of light (26).
Abstract:
Anordnung (38) zur Beobachtung eines Himmelskörpers umfassend • ein Beobachtungsinstrument (11) mit einem Spektrographen (20) zur Zerlegung von durch die Eingangsöffnung (14) einfallendem Licht in Spektrallinien (23) sowie mindestens einem elektronischen Bildsensor (24) zur Detektion mindestens einer der Spektrallinien (23), • eine Ausgleichsvorrichtung (40) mit mindestens einer Ausgleichsachse (48, 56, 58) zum Ausgleich einer durch die Erdrotation hervorgerufenen Relativbewegung zwischen dem Himmelskörperbild und dem Beobachtungsinstrument (11), • mindestens eine Scanachse (45, 47, 63) zur Erzeugung einer Relativbewegung zwischen dem Himmelskörperbild und dem Beobachtungsinstrument (11), sowie Verfahren zum Bewegen eines Himmelskörperbildes gegenüber einem Beobachtungsinstrument (11) unter Verwendung der Anordnung (38) .
Abstract:
Beobachtungsinstrument (12) zur Beobachtung eines Himmelskörpers (14) mit • einer Eingangsebene (18) mit einem Eingangsspalt (20) zum Einlass mindestens eines Teils eines Himmelskörperbildes, • einem Spektrographen (22) zur Zerlegung von durch den Eingangsspalt (20) einfallendem Licht (24) in Spektrallinien (26), • einer Bilderzeugungsvorrichtung (28) zur Erzeugung des Himmelskörperbildes auf der Eingangsebene (18), umfassend oein erstes Reflexionselement (30) mit einer ersten optischen Achse (32), oein zweites Reflexionselement (34) mit einer zweiten optischen Achse (36), wobei das erste Reflexionselement (30) mit dem zweiten Reflexionselement (34) in optischer Wirkverbindung steht, und wobei die zweite optische Achse (36) gegenüber der ersten optischen Achse (32) einen translatorischen und/oder winkligen Versatz aufweist.
Abstract:
[Problem to be solved] An object of the present invention is to provide a microscopic Raman spectroscopy device that can achieve downsizing and cost reduction by simplifying a structure of a spectrometer and can always analyze samples with high accuracy. [Solution] A microscopic Raman spectroscopy device 1 includes laser oscillators (excitation light sources) 2 and 3 that emit excitation laser lights (excitation lights) L1 and L2 of different wavelengths, a spectrometer 10 that uses a diffraction grating 12 or 13 to disperse Raman scattering light R1 or R2 emitted from a sample S by irradiation with the excitation laser light L1 or L2 from the laser oscillator 2 or 3, and a CCD detector 20 that detects and photoelectrically converts the Raman scattering light R1 or R2 dispersed by the spectrometer 10. The spectrometer 10 includes incident apertures 11a and 11b, a plurality of (two) optical systems I and II that guide the Raman scattering light R1 or R2 incident from the incident aperture 11a or 11b to the diffraction grating 12 or 13, and a plurality of light beams dispersed by the diffraction grating 12 or 13 are incident on one imaging lens 14 in tandem.