摘要:
A photoionization detector comprised of a sensor having at least a collector electrode (304) and a grounding electrode (306), a gas discharge lamp that ionizes molecules of interest to create ionized molecules and electrons, and an amplifier connected to the collector electrode. Each of the collector electrode and the grounding electrode include a feed-thru pin (308, 310), an inner trace surrounding the feed-thru pin (312, 314), an outer trace surrounding the inner trace (320, 322), wherein the outer trace on each electrode is comprised of the same material, a channel between the inner trace and the outer trace (316, 318), wherein the channel is comprised of a different material than the outer trace and the inner trace, and a bridge connecting the outer trace with the inner trace (324, 326). The ionized molecules are collectable by a bias electrode (302) and electrons are collectable by the collector electrode.
摘要:
The invention provides an adaptive analytical instrument, comprising a computer controlled target-analyte permeation testing instrument programmed to (-) periodically measure target-analyte transmission rate throughout a permeation testing period, and (-) perform an individual zero of the target-analyte sensor at the conclusion of the permeation testing period when the ascertained target-analyte transmission rate of the test film is below a predetermined threshold value.
摘要:
The invention provides an adaptive analytical instrument, comprising a computer controlled target-analyte permeation testing instrument programmed to (-) periodically measure target-analyte transmission rate throughout a permeation testing period, (-) periodically rezero the target-analyte sensor throughout the permeation testing period, and (-) adjust frequency of future rezeros of the target-analyte sensor based upon the value of at least one previous target-analyte transmission rate measurement.
摘要:
A fiber optic analyte sensing needle (10, 20) employing an analyte-partial-pressure-sensitive photoluminescent probe (70), characterized by (i) a void volume channel (68) extending axially along the length of the lumen (29) between the inner surface of the tube and the outer surface of the fiber optic filament (50), and (ii) a total pressure sensor (90) in pressure communication with the distal tip (20 2 ) of the needle (20) via the void volume channel (68), whereby total pressure of a volume sampled by the sensing needle (20) can be routinely measured and used in pressure compensation of analyte-concentration values calculated from the analyte-partial-pressure readings taken from the analyte-partial-pressure-sensitive photoluminescent probe (70).
摘要:
A fiber optic analyte sensing needle (10) with a photoluminescent analyte-sensitive probe (70) nonadherently entrapped within the lumen (29) of the needle (20) between the distal tip (51) of a fiber optic filament (50) and the distal tip (21) of the needle (20) . The probe (70) has unimpeded fluid communication with the external environment through a port (28) in the needle (20).
摘要:
A sheet of sensors and a method of manufacturing such sheet of sensors. The sheet is configured with (A) a tessellated zipper pattern of identically shaped elements defining (i) a right longitudinal column consisting of a base portion of a right set of elements, (ii) a left longitudinal column consisting of a base portion of a left set of elements, and (iii) an intermediate longitudinal column consisting of alternating tab portions of the right and left elements, and (B) a continuous longitudinal strip of functional material positioned only within the intermediate column.
摘要:
A needle valve (10) with a hollow needle (70) effective for permitting a portion of the fluid passing through the valve to flow throughout the valve and exit through any leaks in the valve, whereby any environmental fluid within the valve is displaced by the fluid passing through the valve.
摘要:
A calibration card (10) and method of using the card (10) to calibrate an analytical instrument capable of reading a photoluminescent oxygen probe. The card (10) includes at least (a) a first mass of an oxygen sensitive photoluminescent dye (51) retained within a hermetically sealed space so as to isolate the dye (51) from environmental oxygen, and in fluid communication with an activated metal-air battery (70) whereby any oxygen permeating into the hermetically sealed space is quickly consumed by the battery (70), and (b) a second mass of an oxygen sensitive photoluminescent dye (52) in fluid communication with the environment whereby the second mass of photoluminescent dye (52) is exposed to an environmental concentration of oxygen.
摘要:
An instrument (10) for detecting leaks in a hermetically sealed package (100). The instrument (10) includes (i) a hollow needle (20), (ii) a mass flow rate sensor (70) in sealed fluid communication with the lumen defined by the hollow needle (20), and (iii) a vacuum pump (60). The vacuum pump (60) is in fluid communication with the lumen defined by the needle (20) for evacuating gas (102) from the hermetically sealed package (100), and in fluid communication with the mass flow rate sensor (70) for directing mass flow from the evacuated package (100) into operable contact with the mass flow rate sensor (70) so as to permit sensing of any continuing mass flow from the evacuated package (100). The instrument (10) may further include an oxygen sensor (40) in sealed fluid communication with the lumen defined by the hollow needle (20) for analyzing the oxygen concentration of the gas (102) within the hermetically sealed package (100).