Photometrically modulated delivery of reagents
View Patent ↗A process system adapted for processing of or with a material therein. The process system includes: a sampling region for the material; an infrared photometric monitor constructed and arranged to transmit infrared radiation through the sampling region and to responsively generate an output signal correlative of the material in the sampling region, based on its interaction with the infrared radiation; and process control means arranged to receive the output of the infrared photometric monitor and to responsively control one or more process conditions in and/or affecting the process system.
1. A method of performing process control in a manufacturing process, the method comprising
monitoring a gaseous material using a system adapted to supply the gaseous material to a gaseous material-utilizing manufacturing process region, the system comprising: (a) a sampling region for analyzing the gaseous material; (b) a monitor in sensory communication with the sampling region, the monitor being constructed and arranged to responsively generate an output signal correlative of presence or concentration of any of (i) at least one species of said gaseous material, and (ii) at least one decomposition by-product of said gaseous material or a species thereof; and (c) a process controller arranged to receive the output signal of the monitor and to responsively control one or more process conditions in and/or affecting the gaseous material-utilizing manufacturing process region, and
controlling one or more process conditions in and/or affecting the gaseous material-utilizing manufacturing process region responsive to the output signal of the monitor.
2. The method of claim 1 , wherein the monitor comprises an infrared radiation source arranged to emit infrared radiation into the sampling region; and a photometric detector arranged to receive infrared radiation from the sampling region.
3. The method of claim 2 , wherein the monitor further comprises at least one infrared radiation filter element optically coupled between the infrared radiation source and the photometric detector.
4. The method of claim 1 , wherein the monitor comprises a photometric monitor.
5. The method of claim 4 , wherein the process controller is adapted to receive the output signal to determine whether degradation of gaseous material exceeds a predetermined level.
6. The method of claim 2 , wherein monitoring the gaseous material comprises photometrically detecting radiation emitted into the sampling region and responsively generating an output signal correlative of presence or concentration of any of (i) at least one species of said gaseous reagent material, and (ii) at least one decomposition by-product of said gaseous reagent material or a species thereof.
7. The method of claim 1 , further comprising utilizing the process controller to suppress degradation of the gaseous responsive to the output signal from the monitor.
8. The method of claim 1 , wherein the gaseous material is generated from a non-gaseous material.
9. The method of claim 8 , wherein the non-gaseous material is transformed into the gaseous material by vaporizing, subliming, volatilizing, or atomizing.
10. The method of claim 1 , wherein gaseous material further comprises a solid or a liquid.
11. The method of claim 1 , wherein the monitor comprises an infrared photometric monitor constructed and arranged to transmit infrared radiation through the sampling region and to responsively generate an output signal correlative of presence or concentration of the gaseous reagent species in the sampling region, based on its interaction with the infrared radiation.
12. The method of claim 1 , wherein said process controller is adapted to control a delivery parameter selected from gaseous material flow rate, vaporizer temperature, pressure and combinations thereof.
13. The method of claim 1 , further comprising supplying the gaseous material to the gaseous material-utilizing manufacturing process region from a source vessel.
14. The method of claim 1 , further comprising flow circuitry for the gaseous material.
15. The method of claim 14 , wherein a portion of the flow circuitry is heated.
16. The method of claim 1 , wherein the sampling region comprises a gas cell, and the gas cell is heated to prevent condensation.
17. The method of claim 1 , wherein the process controller controls flow rate of the gaseous material, temperature of the gaseous material, or utilization of the gaseous material in the gaseous-material utilizing manufacturing process region.
18. The method of claim 1 , comprising controlling gaseous material flow rate, temperature, or utilization in the gaseous-material utilizing manufacturing process region.
19. The method of claim 2 , wherein the process controller is adapted to control a delivery parameter selected from gaseous material flow rate, temperature, pressure and combinations thereof.
20. The method of claim 2 , comprising controlling gaseous material flow rate, temperature, or utilization in the gaseous-material utilizing manufacturing process region.