Abstract:
Anstelle der Ferraris-Läuferscheibe als Umlaufblende (1) in einem NDIR-Gasanalysator wird ein flachzylindrischer Rotor aus NE-Metall eingesetzt, der auf einer kreisringförmigen Teilfläche (3) in gleichmäßigen Abständen angebrachte, radial gerichtete schlitzförmige Durchbrechungen (4) aufweist, in welchen stabförmige Elemente (5) eines weichmagnetischen Werkstoffs angeordnet sind (in eine Ebene projizierter Kurzschluß-Käfigläufer). Der ein Drehfeld erzeugende Stator besteht aus mindestens zwei Elektromagnetsystemen (8, 8′), durch deren Luftspalte (11, 11′) sich die kreisringförmige Teilfläche (3) bewegt und die mit hinsichtlich Phasenlage und Amplitude oder Frequenz unterschiedlichen Wechselströmen gespeist sind. Die Erfindung wird angewandt als Chopper in Gasanalysegeräten.
Abstract:
The system is provided with a first branch (10, 12) and a second branch (14) which receive light from a sample and reference target respectively. A shutter (22) sequentially allows light from the two branches to pass to a mirror (20) having a slit (30), reflective portions (32) and transparent portions (34). Light from the first branch passes through portions (30) and (34) to a detecting branch (42, 46, 50-56) and some light is reflected through a lens (16) to eye piece (19). Similarly some light from the second branch passes through mirror (30) and (34) to eye piece (19) and some light is reflected to the detecting branch. Accordingly the measunngfield can be accurately identified by looking through the eye piece (19) whilst at the same time light is directed to the detecting branch for analysis.
Abstract:
The present invention relates to an ultraviolet ray sensor based on an etched optical fiber Bragg grating and an azobenzene polymer, which improves a reaction velocity as to an ultraviolet ray and a recovery velocity to an initial value in case the ultraviolet ray disappears, as maintaining the function of the ultraviolet ray sensor based on an optical fiber grating coated with the conventional azobenzene polymer as it is, by forming an etching area in a fixed section along the length direction of an optical fiber and then forming an optical reaction part by coating an azobenzene polymer on the etching area. The ultraviolet ray sensor based on an etched optical fiber Bragg grating and an azobenzene polymer according to the present invention includes an optical fiber which has a fiber Bragg grating (FBG) formed in the etching area as including the etching area; and the azobenzene polymer for inducing a tensile force in the fiber Bragg grating when exposed to an ultraviolet ray by being coated in the etching area of the optical fiber in the state of surrounding the fiber Bragg grating. Here, the etching area is formed by etching a whole cladding or a part of a core of a fixed section along the length direction of the optical fiber.
Abstract:
PURPOSE: A pyroelectric infrared sensor system is provided to improve convenience of use by preventing a convenience unit connected to the pyroelectric infrared system from being shut off. CONSTITUTION: A pyroelectric infrared sensor system includes an induction unit for inducing a secondary detection by using a pyroelectric infrared sensor and a chopper(32). In order to obtain a relationship between the pyroelectric infrared sensor and the chopper(32), data detected by the pyroelectric infrared sensor are inputted into a microprocessor. When the chopper is moved, a signal value is detected by means of an infrared ray source. When the infrared ray source moves from a left to a right of the pyroelectric infrared sensor, signals having plus and minus values are detected from an X-axis.
Abstract:
The invention relates to a method and a device for obtaining a low-noise optical signal.According to the method, a luminous beam is injected through two apertures and after detection respectively a basic optical signal (21) and a corrective optical signal (22) are generated. Both optical signals obtained (21, 22) are subtracted, so that a resulting optical signal is generated, forming the low-noise optical signal. The apertures are preferably two slits of a spectroscope, the optical signals being expressible relative to the wavelength.