摘要:
Die Erfindung betrifft eine Vorrichtung (1) zur Bestimmung des Taupunktes eines Gases in einem Prozessraum (2) umfassend ein Temperierelement (3) und einen Temperatursensor (4) zur Bestimmung der Temperatur im Prozessraum (2), welcher in wärmeleitender Wirkverbindung mit dem Temperierelement (3) steht, wobei das Temperierelement (3) zum aktiven Erwärmen und Abkühlen des Temperatursensors (4) ausgebildet ist. Erfindungsgemäss ist der Temperatursensor in direktem Kontakt am Temperierelement (3) angeordnet.
摘要:
The dew point sensor device comprises a semiconductor substrate (1), a Peltier element (2), which may be integrated in the substrate (1), a temperature sensor (3), a capacitor (4) at an exposed surface (9) above the substrate (1) and in the vicinity of the temperature sensor (3), and an electronic circuit (5), which may also be integrated in the substrate (1). The capacitor (4) comprises a plurality of capacitor elements (40) each having a capacitance, and the electronic circuit (5) is provided for an individual determination of the capacitances. The dew point is determined by a measurement of the variation of the capacitances at decreasing temperatures and a measurement of the relevant temperature.
摘要:
Für eine faseroptische Messvorrichtung mit einem optisch transparenten Sensorkopf (2), der mit zumindest einer Lichtsendefaser (4) und zumindest einer Lichtempfangsfaser (5) oder einem zweiten Lichtleiter verbunden ist, mit einer Lichtquelle, die direkt oder wirkungsmäßig mit der Lichteingangsfaser (5) verbunden ist, wobei die Lichtsendefaser (4) zumindest einen Teil des Lichtes der Lichtquelle in den Sensorkopf (2) leitet, welches an zumindest einer optischen Grenzschicht (7) des Sensorkopfes (2) mindestens einmal reflektierbar ist und in die Lichtempfangsfaser (5) auskoppelbar ist und mit einem Lichtdetektor verbunden ist, soll eine Lösung geschaffen werden, die sich durch eine weitgehende Unempfindlichkeit gegenüber elektromagnetischen Störungen und sehr geringe eigene Abstrahlungen auszeichnet und mit der die Messung mehrerer Parameter wie der Betauungszustand und die Temperatur mittels eines Sensors möglich ist. Dies wird dadurch erreicht, dass in dem Sensorkopf (2) zumindest ein temperaturabhängiger Lumineszenzfarbstoff (9) eingelagert ist, der mittels des in die Lichtsendefaser (4) eingekoppelten Lichtes anregbar ist, und eine Abklingzeit eines Lumineszenzlichtes des Lumineszenzfarbstoffs von dem Lichtdetektor messbar ist, wobei das Lumineszenzlicht mittels der Lichtempfangsfaser (5) an den Lichtdetektor übertragbar ist.
摘要:
In a first aspect the invention relates to a sensor system (10) for determining a proximity to icing conditions of an environment. The system includes a sensor having a sensor surface (12) for exposure to the environment, an electrically powered heat pump means (16) for cooling and/or heating the surface (12), and a temperature detector (14) for providing a signal representative of the temperature of the surface (12). An environment temperature is determined, and a processor determines, from the temperature detected by the temperature detector (14) and the environment temperature, a proximity to icing conditions of the environment to which the surface (12) is exposed. In a second aspect of the invention the sensor system includes a power monitor for determining an amount of power required to heat or cool the surface through a temperature indicative of ice formation. The processor determines the proximity to icing conditions from the detected temperatures and the amount of cooling or heating power.
摘要:
The invention relates to a field of measuring engineering. For increase in speed, sensitivity and accuracy of measurement of a hydrocarbon dew point, a method for hydrocarbon dew point temperature measurement is provided, comprising feeding gas to be studied onto a cooled element with a condensation surface onto which a light flux is directed at an angle providing its reflection in the observation aperture, a cooling of condensation surface of a cooled element and registering the value of the light flux reflected from the condensation surface, advent of the hydrocarbon dew point being determined on the basis of the registered value, and as a material for condensation surface of a cooled element use silicon. The device for hydrocarbon dew point temperature measurement contains a cooled element (4) with condensation surface contained in a housing (1), having openings (2) and (3) for an input and an exit of the gas to be studied, a cooler (5), the temperature sensor (6), the light source (7), located in such a manner that a light flux from it is directed after reflection from condensation surface of a cooled element (4) to the observation aperture (8) on the registrar (9) of the reflected beams, and the cooled element (4) with condensation surface is made from dielectric with refraction factor greater than refraction factor of liquid hydrocarbons.
摘要:
The invention relates to a method and a sensor for determining the hydrocarbon dew point in a gas, in particular in a gaseous fuel. The invention provides a roughened condensation surface on a planar measurement surface of a transparent body. Light is shone onto the roughened condensation surface through the transparent body and the intensity of the light reflected back into the transparent body is measured. The hydrocarbon dew-point temperature can be inferred from changes in the intensity of the light which is reflected back when heating or cooling the condensation surface.
摘要:
The invention relates to a sensor unit for a device for avoiding condensation of a gas, in particular water vapour, on a surface of an object, comprising a temperature measuring device, for measuring an object temperature, a dew-point determining device for determining a dew-point temperature of the gas in an atmosphere surrounding said object and a regulation and control device which cooperates with the temperature measuring device and the dew-point determining device and by means of which an actuator for increasing a temperature difference between the object temperature and the dew-point temperature may be controlled a function of the data obtained from the temperature measuring device and the dew-point determining device such that a dropping of the object temperature to or below the dew-point temperature is avoided. According to the invention, the sensor unit is characterised in that the dew-point determining device is embodied as a dew-point sensor for the direct determination of the dew point and the temperature measuring device is embodied as a contactless temperature sensor. The invention further relates to a device and a method for avoiding the condensation of a gas, in particular water vapour, on a surface of an object.
摘要:
The invention concerns dew point hygrometers based on condensation of dew on ends of optical fibers, or on surfaces of an optical prism. The invention also concerns a dew sensor for determining the natural dew condensation by optical means and a dew sensor capable of detecting dew by detecting a change in capacitance.
摘要:
A dewpoint sensor comprises (100) a pressure vessel (104) having an entry port (106), an exit port (108), and a temperature controlled plate (110). A quartz crystal resonator (112) is housed within the pressure vessel (104) and disposed in intimate contact with the temperature controlled plate (110). A temperature sensor (114) is disposed to generate signals representative of the quartz crystal resonator temperature. Circuitry (116) is coupled to the quartz crystal resonator (112) and the temperature sensor (114), which circuitry is configured to control the temperature of the quartz crystal resonator, to measure the frequency of the quartz crystal resonator and to monitor the frequency of the quartz crystal resonator when exposed to a flow (118) between the entry port (106) and the exit port (108) so as to calculate a dewpoint value of the flow.