| 主权项 |
1. A photo-ionization detector (PID), comprising:
a substrate comprising
a gas ionization chamber,at least one pair of ion sensing electrodes,at least one amplifying circuit to amplify a response signal generated by the ion sensing electrodes to form amplified signals;and a heating element; an ultraviolet (UV) ionization source to transmit a UV light beam into the gas ionization chamber, wherein the substrate is a multilayered substrate comprising an alternating arrangement of at least four conducting layers insulated by at least three dielectric layers positioned therebetween, the four conducting layers having at least a first layer and at least a third layer each comprising pairs of ion sensing electrodes; at least a second layer comprising a fence electrode to prevent leakage of current between ion sensing electrodes; and at least the fourth layer comprising the heating element; wherein each of the conducting layers and the dielectric layers are interconnected by multiple open holes or open slots, and the open holes and the open slots provide channels to form the gas ionization chamber throughout said multilayered substrate, and wherein the photo-ionization detector is configured to detect aliphatic hydrocarbons, aromatic hydrocarbons, aldehydes, ketones, or alcohols. |
