31-05-2012 дата публикации
Номер: US20120136268A1
A photo ionization detector (PID) is provided for selectively determining various compounds or gases present in a breath sample. The PID, comprises a substrate comprising a gas ionization chamber, at least one pair of ion sensing electrodes, and at least one amplifying circuit; and an ultraviolet (UV) ionization source to transmit a UV light beam into the gas ionization chamber. A system comprises the PID is also provided. A method of detecting a response pattern for various compounds or gases in breath using PID is also provided. 1. A photo-ionization detector (PID) , comprising: a gas ionization chamber,', 'at least one pair of ion sensing electrodes,', 'and at least one amplifying circuit; and, 'a substrate comprising'}at least one ultraviolet (UV) ionization source to transmit a UV light beam into the gas ionization chamber in the substrate.2. The photo-ionization detector of claim 1 , wherein the substrate further comprises a heating element.3. The photo-ionization detector of claim 1 , wherein the substrate further comprises a temperature sensor.4. The photo-ionization detector of claim 1 , wherein the substrate further comprises a temperature feedback control circuit.5. The photo-ionization detector of claim 1 , wherein the substrate is made of one or more conducting layers claim 1 , dielectric layers claim 1 , or combinations of conducting layers and dielectric layers.6. The photo-ionization detector of claim 1 , wherein the substrate is a printed circuit board.7. The photo-ionization detector of claim 1 , wherein the substrate comprises an array of holes or open slots.8. The photo-ionization detector of claim 1 , wherein the detector comprises a plurality of UV sources.9. The photo-ionization detector of claim 1 , wherein the ultraviolet (UV) ionization source is an ultraviolet lamp (UV lamp) claim 1 , or a light emitting diode (LED).10. The photo-ionization detector of claim 1 , wherein the UV light beam is directed into the gas ionization chamber ...
Подробнее