US 12,405,246 B2
Photoionization detector lamp and its method of manufacture
Chuang Huang, Shanghai (CN); and Qingling Wang, Shanghai (CN)
Assigned to HONEYWELL INTERNATIONAL INC., Charlotte, NC (US)
Filed by HONEYWELL INTERNATIONAL INC., Charlotte, NC (US)
Filed on May 15, 2023, as Appl. No. 18/317,180.
Claims priority of application No. 202210615209.3 (CN), filed on Jun. 1, 2022.
Prior Publication US 2023/0393095 A1, Dec. 7, 2023
Int. Cl. G01N 27/66 (2006.01); G01N 30/64 (2006.01)
CPC G01N 27/66 (2013.01) [G01N 30/64 (2013.01); G01N 2030/642 (2013.01)] 20 Claims
OG exemplary drawing
 
15. A photoionization detector comprising:
two electrodes; and
a vacuum ultraviolet lamp comprising:
a glass tube, the glass tube defining a first end;
a crystal window sealed to the first end of the glass tube, wherein sealing the crystal window to the first end of the glass tube comprises:
applying a mixed powder coating composition onto an edge surface of the first end of the glass tube, the mixed powder coating composition comprising indium powder and glass powder;
applying a glass powder coating composition over the mixed powder coating composition;
attaching the crystal window to the edge surface of the first end of the glass tube; and
heating the glass tube and the crystal window to seal the crystal window to the glass tube.