# US 8,786,290 B2 · Corona effluent sensing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,290 B2 - Document ID: US8786290B2 - Status: Granted - Kind: B2 - Application number: 13/314,880 - Filed: 2011-12-08 - Published: 2012-04-05 - Granted: 2014-07-22 - Earliest claimed: 2009-04-03 - Assignees: Xerox Corporation - Applicants: Richard Klenkler - Inventors: Richard Klenkler - Web page: https://patentgrep.com/patent/US8786290B2 ## CPC - G01R 31/1218: {using optical methods; using charged particle, e.g. electron, beams or X-rays} - G01N 27/126: {comprising organic polymers} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract The presently disclosed embodiments are directed to the detection and monitoring of corona effluent. The present embodiments pertain to a corona sensing device that employs a film of organic charge transporting material, as the active component in a corona effluent sensing device, that is disposed onto a patterned electrode bearing support member. ## Claims ### Claim 1 A corona sensing system, comprising: a scorotron including a corona wire and an insulating mount, where the scorotron is energized by applying a current to the corona wire and corona effluents are generated; a corona sensing device, including: a support member; a first electrode and a second electrode placed on the support member; a semiconducting film disposed on the support member and the first and second electrodes, the semiconducting film comprising an organic charge transporting material; and a first wire lead and a second wire lead allowing for connection of the first electrode and the second electrode to an external resistivity monitoring circuit; and an external resistivity monitoring circuit comprising an ammeter and a constant voltage power supply for detecting corona effluents generated by the applying of the current to the corona wire, the corona effluents detected by monitoring for any decrease in resistivity through the semiconducting film with the external resistivity monitoring circuit as indicating the presence of corona effluents. ### Claim 2 (depends on 1) The corona sensing system of claim 1, wherein the semiconducting film comprises from about 20% to about 80% charge transporting molecules. ### Claim 3 (depends on 2) The corona sensing system of claim 2, wherein the charge transporting molecules are selected from the group comprising of N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD), 1,1-bis((di-4-tolylamino)phenyl)-cyclohexane (TAPC), N,N-bis(3,4-dimethylphenyl)-4-aminobiphenyl (DMPAB), p-diethylaminobenzaldehyde diphenylhydrazone (DEH) and mixtures thereof. ### Claim 4 (depends on 3) The corona sensing system of claim 3, wherein the charge transporting molecule is N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD). ### Claim 5 (depends on 1) The corona sensing system of claim 1, wherein the semiconducting film comprises from about 20% to about 80% polycarbonate of 4,4′-(propan-2-ylidene)diphenol (bisphenol A) or 4,4′-cyclohexylidenebisphenol (bisphenol Z type). ### Claim 6 (depends on 1) The corona sensing system of claim 1, wherein the semiconducting film comprises about 50% N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine and about 50% polycarbonate. ### Claim 7 (depends on 1) The corona sensing system of claim 1, wherein the semiconducting film has a thickness of from about 0.2 μm to about 10 μm. ### Claim 8 (depends on 1) The corona sensing system of claim 1, wherein the first and second electrodes have a thickness of from about 0.05 μm to about 0.2 μm. ### Claim 9 (depends on 1) The corona sensing system of claim 1, wherein a separation distance between the first electrode and the second electrode is from about 10 μm to about 50 μm. ### Claim 10 A corona sensing system, comprising: a scorotron including a corona wire and an insulating mount, where the scorotron is energized by applying a current to the corona wire and generates corona effluents; and a corona sensing device, including a support member; a first electrode and a second electrode placed on the support member; a semiconducting film disposed on the support member and the first and second electrodes, the semiconducting film comprising an organic charge transporting material comprising from about 20% to about 80% N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine and from about 20% to about 80% polycarbonate; and a first wire lead and a second wire lead allowing for connection of the first electrode and the second electrode to an external resistivity monitoring circuit, wherein a measurement of a decrease in resistivity indicates the presence of corona effluents. ### Claim 11 A method for detecting and monitoring corona effluents, comprising: providing a scorotron including a corona wire and an insulating mount; applying a current to a corona wire to energize the scorotron and generate corona effluents; providing a corona sensing device including a support member; a first electrode and a second electrode placed on the support member; a semiconducting film disposed on the support member and the first and second electrodes, the semiconducting film comprising an organic charge transporting material; and a first wire lead and a second wire lead allowing for connection of the first electrode and the second electrode to an external monitoring circuit; and monitoring for any decrease in resistivity through the semiconducting film with the external monitoring circuit, wherein a measurement of a decrease in resistivity indicates the presence of corona effluents. ### Claim 12 (depends on 11) The method of claim 11 further including resetting the corona sensing device after exposure to corona effluents by applying a mild heat treatment of from about 50° C. to about 100° C. ### Claim 13 (depends on 11) The method of claim 11, wherein the semiconducting film comprises from about 20% to about 80% charge transporting molecules. ### Claim 14 (depends on 11) The method of claim 11, wherein the charge transporting molecules are selected from the group comprising of N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD), 1,1-bis((di-4-tolylamino)phenyl)-cyclohexane (TAPC), N,N-bis(3,4-dimethylphenyl)-4-aminobiphenyl (DMPAB), p-diethylaminobenzaldehyde diphenylhydrazone (DEH) and mixtures thereof. ### Claim 15 (depends on 14) The method of claim 14, wherein the charge transporting molecule is N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD). ### Claim 16 (depends on 11) The method of claim 11, wherein the semiconducting film comprises from about 20% to about 80% polycarbonate of 4,4′-(propan-2-ylidene)diphenol (bisphenol A) or 4,4′-cyclohexylidenebisphenol (bisphenol Z type). ### Claim 17 (depends on 11) The method of claim 11, wherein the semiconducting film comprises about 50% N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine and about 50% polycarbonate. ### Claim 18 (depends on 11) The method of claim 11, wherein the semiconducting film has a thickness of from about 0.2 μm to about 10 μm. ### Claim 19 (depends on 11) The method of claim 11, wherein the first and second electrodes have a thickness of from about 0.05 μm to about 0.2 μm. ### Claim 20 (depends on 11) The method of claim 11, wherein a separation distance between the first electrode and the second electrode is from about 10 μm to about 50 μm.