Method of sensing an amount of moisture on a surface of a substrate with temperature compensation
First Claim
1. A method of determining an amount of moisture on a surface of a substrate, said method comprising the steps of:
- transmitting a transmitter signal to generate a vibrational wave;
propagating the vibrational wave to vibrate the substrate;
detecting the vibrations of the substrate;
convening the vibrations into a receiver signal;
sensing the temperature of the substrate; and
compensating for a phase shift between the transmitter signal and the receiver signal attributable to the temperature of the substrate to determine the amount of moisture on the surface;
wherein said step of compensating includes determining a measured phase shift corresponding to at least one of the amount of moisture on the surface and the temperature of the substrate;
wherein said step of compensating includes determining a temperature phase shift attributable to the temperature of the substrate;
wherein said step of determining the temperature phase shift includes ascertaining the temperature phase shift as a function of the temperature of the substrate; and
wherein said step of determining the temperature phase shift includes storing the temperature phase shift as a function of the temperature of the substrate in a table.
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Abstract
A method for determining an amount of moisture on a surface of a substrate includes a step of transmitting a transmitter signal to generate a wave. The transmitter signal has a first phase. The wave is propagated to vibrate the surface. Vibrations in the surface are detected and converted into a receiver signal. The receiver signal has a second phase different than the first phase. The method includes the step of sensing the temperature of the substrate. The amount of moisture on the surface is computed based on a phase shift between the transmitter signal and the receiver signal that has been compensated to account for surface temperature.
36 Citations
24 Claims
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1. A method of determining an amount of moisture on a surface of a substrate, said method comprising the steps of:
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transmitting a transmitter signal to generate a vibrational wave; propagating the vibrational wave to vibrate the substrate; detecting the vibrations of the substrate; convening the vibrations into a receiver signal; sensing the temperature of the substrate; and compensating for a phase shift between the transmitter signal and the receiver signal attributable to the temperature of the substrate to determine the amount of moisture on the surface; wherein said step of compensating includes determining a measured phase shift corresponding to at least one of the amount of moisture on the surface and the temperature of the substrate; wherein said step of compensating includes determining a temperature phase shift attributable to the temperature of the substrate; wherein said step of determining the temperature phase shift includes ascertaining the temperature phase shift as a function of the temperature of the substrate; and wherein said step of determining the temperature phase shift includes storing the temperature phase shift as a function of the temperature of the substrate in a table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of determining an amount of moisture on a surface of a substrate, said method comprising the steps of:
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storing a plurality of temperature phase shift values in a table, wherein each temperature phase shift value corresponds to a temperature of the substrate; transmitting a transmitter signal to generate a vibrational wave; propagating the vibrational wave to vibrate the substrate; detecting the vibrations of the substrate; convening the vibrations into a receiver signal; sensing the temperature of the substrate; retrieving the temperature phase shift value corresponding to the sensed temperature of the substrate from the table; determining a temperature phase shift attributable to the temperature of the substrate based on the temperature phase shift value; and determining the amount of moisture on the surface based on the phase shift between the transmitter signal and the receiver signal while compensating for the temperature phase shift attributable to the temperature of the substrate. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification