Optical sash sensing system for fume hoods
First Claim
1. A system for quickly controlling directional airflow into a fume hood having a vertical sash that is composed of:
- a. An optical sensing device mounted inside the fume hood with a light source that shines onto a reflective source and a sensing device that can sense the reflected light and determine the number of iterations of a repeated pattern on the reflective source and produce an output control signal that corresponds to sash movement to produce desired airflow into the fume hood b. A smart controller device that receives output control signals from the optical sensing device, said controller device having its own intelligence capable of producing a drive signal c. An actuation device capable of receiving the output signal from the controlling device to adjust an airflow control device such as a venturi valve or blade damper or some other device that modulates airflow into a duct or other airflow stream, d. Reflective tape mounted strategically on a fume hood sash(es) with proportional, repetitive, encoded patterns on it that can be read by the optical sensing device as the sash is opened or closed on the fume hood.
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Accused Products
Abstract
A fume hood optical sash sensing system for controlling the flow of air into a fume hood to maintain a constant face velocity by utilizing an optical sensing device mounted inside the fume hood that can sense the movement of a sash based on repeatable reflexive tape to produce an output control signal that corresponds to sash movement to produce desired airflow into the fume hood. The system includes an optical sensing device with a light source, reflexive tape with a repetitive, quadrature encoded pattern, a smart controller device that receives output control signals from the optical sensing device, and an actuation device capable of receiving the output signal from the controlling device to control the damper device that will result in constant face velocity across the face of the sash. Obvious permutations of the above can be adapted for various fume hood sash configurations.
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Citations
24 Claims
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1. A system for quickly controlling directional airflow into a fume hood having a vertical sash that is composed of:
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a. An optical sensing device mounted inside the fume hood with a light source that shines onto a reflective source and a sensing device that can sense the reflected light and determine the number of iterations of a repeated pattern on the reflective source and produce an output control signal that corresponds to sash movement to produce desired airflow into the fume hood b. A smart controller device that receives output control signals from the optical sensing device, said controller device having its own intelligence capable of producing a drive signal c. An actuation device capable of receiving the output signal from the controlling device to adjust an airflow control device such as a venturi valve or blade damper or some other device that modulates airflow into a duct or other airflow stream, d. Reflective tape mounted strategically on a fume hood sash(es) with proportional, repetitive, encoded patterns on it that can be read by the optical sensing device as the sash is opened or closed on the fume hood. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification