Abstract:
Methods and apparatuses for detecting moisture are disclosed. Embodiments detect the existence and/or level of moisture in electronic devices, such as by using one or more moisture sensors that removably connect to a pre-existing port in the electronic device (such as a headphone jack or similar port). Some embodiments detect a component of the ambient air (such as moisture level) to improve the accuracy of the moisture detector. Some embodiments decrease pressure at the port using a pneumatic pump and move gas from the electronic device into the moisture detector. Some embodiments detect the movement of air in the vicinity of at least one moisture sensor (such as by measuring pressure) and use this information to improve the accuracy of the moisture detector. Some embodiments display information related to the moisture in the electronic device and/or the ambient air.
Abstract:
A humidity sensor and filter assembly are housed within a cylindrical barrel that is positioned in a process gas stream such as combustion flue gas. A portion of sample flue gas is conducted through the barrel and the filter assembly past the sensor located inside the filter so that accurate humidity measurements can be taken. Unwanted flue gas particulate matter accumulated on the outside surface of the filter is ejected by pulsed purge gas admitted into the filter to reverse the flow through the filter. In one embodiment a heat exchange chamber preheats the purge gas. In another embodiment the pulsed purge is supplied by a reciprocal piston contiguous with the internal volume of the filter that reverses the flow through the filter using the process gas.
Abstract:
Bei dem Verfahren wird in eine durch Bewegung intensiv mit ggf. darin enthaltenem freien Wasser durchmischte Probe der zumindest darauf zu prüfenden Flüssigkeit eine an das Probenvolumen angepasste Menge von stark hygroskopischen, durch zumindest Aufnahme des freien Wassers aufquellend sich vergrößernden Festkörperpartikel gegeben, wie z. B. "Superabsorber" genannte superabsorbierende Polymer-Kunststoffpartikel in einer Grössenordnung von typischerweise 10 bis 100 μm, und die Probe wiederum durch Bewegung intensiv durchmischt; nach einer angemessenen Reaktionszeit wird die Probe durch den Messkanal eines Messgeräts geleitet, wie z. B. eines handelsüblichen, laserbasierten optischen, nach dem Lichtabschattungsprinzip arbeitenden Partikelmess- bzw. -Zählgeräts, und dabei die Größe der einzelnen aufgequollenen Festkörperpartikel über das Ausmaß der von ihnen jeweils bewirkten Lichtabschattung, sowie ggf. auch ihre Anzahl gemessen und daraus mittels einer Messwerte-Auswerteeinheit zumindest der Gehalt an freiem Wasser in der Probe ermittelt und als z. B. numerischer Wert z. B. angezeigt und/oder ausgedruckt.
Abstract:
A fluid sensor (10) comprises a senor housing (12), a sensor package (14), an actuator and a switch (18). The sensor package(14) is disposed within the sensor housing (12) and includes first and second screens and at least one sensing membrane (34). The sensing membrane (34) is disposed between the first and second screens and is adapted to expand when exposed to a predetermined quantity of a first predetermined fluid. The actuator (10) is disposed proximate the sensor package within the sensor housing and moveable between a first position and a second position through an intermediate position. The switch is disposed proximate the actuator and is operable between closed and open positions. When the actuator (16) is in the second position at least a portion of the actuator depresses the switch to control an electrical circuit connected therewith.
Abstract:
Un procédé pour déterminer la qualité d'un matériau hygroscopique, tel que du bois ou autres matériaux de construction analogues, comprend les étapes consistant : à mesurer la vitesse de propagation d'ondes sonores à l'intérieur du matériau hygroscopique, - à mesurer le taux d'humidité du matériau hygroscopique, à mesurer la dureté du matériau hygroscopique, et à calculer des valeurs de masse volumique, de module d'élasticité et de résistance à la rupture en flexion pour le matériau hygroscopique, en fonction de la vitesse de propagation d'ondes sonores mesurée, du taux d'humidité mesuré et de la dureté mesurée.
Abstract:
An apparatus and mehtod for measuring the vapor or gas content of a vacuum chamber (1) by a vapor sensor (21) located in the fore-line of a vacuum system is provide. The gas or vapor content is determined by first providing a zero condition for the sensor using the vacuum pump (25) and them referencing the sensor response to the chamber gas during the evacuation cycle.
Abstract:
A first sensor (2, 4, 120, 230, 232, 300) senses an organic gas, liquid or vapor and includes a first support (30, 32, 102, 210, 212, 306) having a first support surface with a layer of material (26, 28, 112, 216, 218, 302) fastened to it. In the presence of liquid, gas or vapor, the material (26, 28, 112, 216, 218, 302) swells and expands so as to vary at least one of its dimensions. Such expansion develops a stress at an interface between the first support surface and the material (26, 28, 112, 216, 218, 302), and strain sensitive devices (14, 16, 100, 204, 206, 210, 212, 306, 308) detect the stress and produce an output which varies as a function of the stress at the interface.
Abstract:
Embodiments of the present invention relate to freshness indication. In some embodiments, a freshness indicating device is provided. The freshness indicating device comprises a collector and an indicator. The collector is adapted to collect water from an object. The object includes at least one of fruits and vegetables. The indicator is adapted to indicate the freshness of the object based on the amount of the collected water. A corresponding method and a container comprising the freshness indicating device are disclosed as well.
Abstract:
Some aspects of the present disclosure feature a system for sensing a change in environment comprising a MMR sensor and a reader. The MMR sensor is configured to be disposed in the environment. The MMR sensor comprises a magnetic bias layer, a resonator, a spacer, and an environmental change receptor. The reader is configured to measure a frequency characteristic of the MMR sensor after the environmental variable changes and the change to the environmental variable is evaluated based on the frequency characteristic.