Multi-frequency sensing system and method

A method, comprising:

• providing, by a controller of a sensor system, one or more control signals to cause generation of a plurality of stimulus signals, each with a different frequency, to a sensing element of the sensor system, wherein the sensing element is configured to receive the plurality of stimulus signals across a frequency range, wherein the plurality of stimulus signals comprise:
• a first stimulus signal at a first frequency;
• a second stimulus signal at a second frequency, wherein the second frequency is separated from the first frequency by a first step width;
• and
• a third stimulus signal at a third frequency, wherein the third frequency is separated from the second frequency by a second step width;
• wherein the first stimulus signal, the second stimulus signal, and the third stimulus signal make up at least a portion of a frequency sweep operation across the frequency range, and wherein the first step width and the second step width are based on a type of sensing material of the sensing element, a type of fluid, or a combination thereof;
• receiving, by the controller, a plurality of sensor responses from the sensing element in response to providing the plurality of stimulus signals;
• determining, by the controller, one or more noise values, one or more baseline drift values, or both based on analyzing the plurality of sensor responses, wherein analyzing the plurality of sensor responses comprises applying a multivariate curve resolution algorithm configured to reduce the one or more noise values, the one or more baseline drift values, or both;
• determining, by the controller, at least one noise reduction value, at least one baseline drift reduction value, or both;
• and
• reducing, by the controller, at least one noise value of the one or more noise values based on the at least one noise reduction value, at least one baseline drift value of the one or more baseline drift values based on the at least one baseline drift reduction value, or both.

A non-transitory computer-readable medium comprising computer-executable instructions that, when executed, are configured to cause a processor to:

• provide one or more control signals to an excitation circuit of a sensor system to generate a plurality of stimulus signals, each with a different frequency, to a sensing element of the sensor system, wherein the sensing element is configured to receive the plurality of stimulus signals across a frequency range, wherein the plurality of stimulus signals comprise:
• a first stimulus signal at a first frequency;
• a second stimulus signal at a second frequency, wherein the second frequency is separated from the first frequency by a first step width;
• and
• a third stimulus signal at a third frequency, wherein the third frequency is separated from the second frequency by a second step width;
• wherein the first stimulus signal, the second stimulus signal, and the third stimulus signal make up at least a portion of a frequency sweep operation across the frequency range, and wherein the first step width and the second step width are based on a type of sensing material of the sensing element, a type of fluid, or a combination thereof;
• receive a plurality of sensor responses from the sensing element in response to providing the plurality of stimulus signals;
• determine one or more noise values, one or more baseline drift values, or both based on analyzing the plurality of sensor responses, wherein analyzing the plurality of sensor responses comprises applying a multivariate curve resolution algorithm configured to reduce the one or more noise values, the one or more baseline drift values, or both;
• determine at least one noise reduction value, at least one baseline drift reduction value, or both;
• and
• reduce at least one noise value of the one or more noise values based on the at least one noise reduction value, at least one baseline drift value of the one or more baseline drift values based on the at least one baseline drift reduction value, or both.