摘要:
A receiver (10) according to the present disclosure includes: a detection unit (11) including a sensor configured to receive a first optical signal of a wavelength included in an absorption band of water molecules and a second optical signal of a wavelength included in an absorption band of carbon dioxide molecules, a signal processing unit (12) configured to calculate a water vapor concentration and a carbon dioxide concentration from changes of intensities of the first and second optical signals, and a determination unit (13) configured to determine whether or not there is a fire that is caused by alcohol combustion based on the water vapor concentration and the carbon dioxide concentration.
摘要:
The subject invention provides devices, and methods of making and using the same, for the non-invasive detection of ethanol in a sample. In specific embodiments, the fuel cell based ethanol detector of the subject invention is capable of measuring the concentration of ethanol vapor in the presence of water vapor, which is known to confound signal readings in conventional detectors. Advantageously, the electrochemical sensors provided herein are highly stable and accurate, especially suitable for low-cost, continuous monitoring of ethanol content in transdermal perspiration samples.
摘要:
A temperature and pressure regulating biogas sample extraction system and method for providing a conditioned biogas sample for constituent analysis.
摘要:
A gas measurement apparatus includes: a body unit including a delivery port in which a user's breath is delivered, a gas sensor connected to the inside of the delivery port, and an absorbent housing unit that houses an absorbent; a cover unit capable of being operated to be slid in a predetermined direction with respect to the body unit and thereby being set to one of an open state in which the delivery port and the absorbent housing unit are exposed and a closed state in which the delivery port and the absorbent housing unit are cut off from an outside air, wherein at least in the closed state, a space in which the gas sensor is provided and the inside of the absorbent housing unit are connected to each other.
摘要:
There is provided a highly accurate gas sensor by improving an S/N ratio of a circuit. One ends (1a), (2a), of heat generating element (1) and reference resistor (2) brought into contact with a detected gas are commonly connected, and respective contacts of first switch (3) are respectively connected to respective sides of other terminals (1b), (2b). First switch (3) is connected with power source apparatus (4) for supplying a current to heat generating element (1) or reference resistor (2). Voltage measuring portion (5) for measuring a voltage across both ends generated across both ends of heat generating element (1) or reference resistor (2) is connected in parallel with heat generating element (1) or reference resistor (2) when first switch (3) is switched. Operating portion (6) switches first switch (3) to a side of reference resistor (2) and switches first switch (3) to the side of heat generating element (1) by a predetermined timing by determining a condition of controlling power source apparatus (4) for supplying at least 3 stages of step-like currents to heat generating element (1) from the voltage across both ends generated at reference resistor (2). Heat generating element (1) is continuously supplied with successively at least 3 stages of step-like currents to carry out operation of inputting the voltage across both ends of heat generating element (1) in correspondence with magnitudes of the respective currents to operating portion (6) by way of voltage measuring portion (5) and calculating and outputting a concentration of a detected gas by making the current off.
摘要:
A gas sensor includes a gas detection chamber into which a detection gas is introduced, a detecting element and a compensating element each disposed in the gas detection chamber, a detection device which detects the concentration of a detection target gas contained in the detection gas, in accordance with a difference in electrical resistance values between the detecting element and the compensating element, and a dehumidifying element which is provided in the gas detection chamber, and reversibly absorbs water contained in the detection gas and drains off the water absorbed in the dehumidifying element.
摘要:
Sensor module package having a housing element (3) with an opening (4) to a sensor cavity (6) for allowing outside air to reach a sensor device (1) positioned in the sensor cavity (6) for sensing a characteristic of the outside air. Sensor electronics (9) are connected to the sensor device (1) for providing an output signal. The sensor device (1) and sensor electronics (9) are positioned on a substrate (2). The sensor cavity (6) is formed by at least a cavity part of the substrate (2), at least a part of the housing element (3) and the opening (4). A cover member (11) is provided with a mechanical firming element (13) for mounting the sensor module package (10) in a vehicle.
摘要:
A gas sensor based on a field effect transistor (“FET”) evaluates both a change in work function of a gas-sensitive layer of the FET and a change in the capacitance of the layer. Thus, two physically independent signals are read from the gas-sensitive layer, each signal representing a sensitivity to a different gas. This reduces the effect of cross-sensitivities; that is, of one gas on the target gas. The underlying physical mechanisms, the first causing a change in the work function in a reaction with gases and the second causing a change in the capacitance of the sensitive layer, are widely different. Because of this, the two parameters demonstrate different gas sensitivities. If the reactions to both gases are known, the effect of the interfering gas on the sensor signal can be compensated for, and with this the concentration of the target gas can be determined.
摘要:
A method for producing a sensor (1) for detecting at least one gas constituent in the exhaust gas of an internal-combustion engine. An electrode structure (3), acting as a capacitor, is applied to a substrate (2). A gas-permeable zeolite layer (6) is applied to the electrode structure (3) and the substrate (2). After the application of the zeolite layer (6), the sensor (1) is heated in the presence of water vapor. During the heating, a voltage is applied to the electrode structure (3). A bias voltage, superimposed on the operating voltage of the electrode structure 3, is applied to a first connection 4 and/or to a second connection 5 of the electrode structure 3.
摘要:
A vaporizer (14) supplies hydrogen peroxide and water vapor to a high level disinfection or sterilization region (20). Mid-infrared light detectors (32) detect light in the mid-infrared range which has traversed a region of the treatment chamber in a first narrow spectrum centered at 8,000 nanometers which is absorbed by the hydrogen peroxide vapor, a second narrow spectrum which is absorbed by the water vapor, and a third spectrum that is absorbed by neither the hydrogen peroxide vapor nor the water vapor. From these measurements, an absorbance or transmittance is determined (40) from which the concentrations of hydrogen peroxide and water vapor are determined (42). Monitored temperature (44) and the determined concentrations are converted into a percent saturation (54). The supply of hydrogen peroxide and water vapor to the chamber is controlled (60) in accordance with the determined percent saturation.