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:
The object of the invention is to provide a process and sensor arrangement for detecting condensations on surfaces characterised by a simple design and simple signal evaluation, and which avoid errors caused by dirt or dew formation delays. This object is attained by a process in which the temperature is measured at the capacitor by an electric resistance sensor which at the same time heats the arrangement, so that when the arrangement cools down a detectable water film is already formed a few Kelvin degrees below the dew point, which causes the arrangement to generate a signal that can be evaluated. A process and sensor arrangement are disclosed for detecting condensations on surfaces by means of a stray field capacitor arranged on a support layer.
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:
A novel freezing point measuring method by which the cloud point of an object to be measured can be measured quickly and accurately. The totally reflected light from a liquid to be inspected, such as the light oil, etc., is measured at each temperature by making light incident to the liquid at an incident angle theta which satisfies a relation, theta
摘要:
The disclosure relates to a condensation monitor for measuring condensation on one side of a window (10) from the other side thereof, the window being located in an enclosure (23) mounted on a chamber wall with a part opening with the interior of the chamber. The monitor comprises a pair of optical prisms (14, 20) positioned on the other side of the window at spaced apart locations to provide transmission of an obliquely angled beam of light into the window and transmission of an obliquely angled beam of light out of the window. A light source (12, 13) adjacent one of the devices provides a parallel beam of light to be transmitted by said device into the window to travel along the window by reflection from side to side to the other device from where the light beam emerges and a ligth sensor (22) measures the amount of light emerging from the window. The amount of light transmitted along the portion between the optical devices depends on the amount of condensation on said one side of the window, condensation facilites losses of the light through said one side by refraction reducing the amount of light transmitted along the window to the light sensor.
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:
The object of the invention is to provide a process and sensor arrangement for detecting condensations on surfaces characterised by a simple design and simple signal evaluation, and which avoid errors caused by dirt or dew formation delays. This object is attained by a process in which the temperature is measured at the capacitor by an electric resistance sensor which at the same time heats the arrangement, so that when the arrangement cools down a detectable water film is already formed a few Kelvin degrees below the dew point, which causes the arrangement to generate a signal that can be evaluated. A process and sensor arrangement are disclosed for detecting condensations on surfaces by means of a stray field capacitor arranged on a support layer.
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.