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US 8,265,881 B1Granted
Techniques for calculating gas concentrations in a fluid environment
AssigneeH2Scan Corporation
InventorsVikas Lakhotia, G. Jordan Maclay
Life of this patent
Estimating the term…
Abstract
A temperature of a gas sensor may be adjusted to a first temperature value for a first period of time and a second temperature value for a second period of time. A signal of the gas sensor may be measured during the first period of time to determine a first signal value and during the second period of time to determine a second value. Then, concentration information for at least one gas is calculated according to the first signal value and the second signal value. While the gas sensor signal may include information about a presence of a first gas and a second gas, the concentration information for the at least one gas may not substantially include concentration information for the second gas.
Claims26
A system comprising:
- a sensing unit including:
- a gas sensor configured to generate a gas sensor signal in response to a presence of at least one gas, and
- a heater configured to adjust a temperature of the gas sensor;
- at least one processor adapted to:
- control the heater to adjust the temperature of the sensor to a first temperature value for a first period of time,
- determine a first signal value by measuring the gas sensor signal during the first period of time,
- control the heater to adjust the temperature of the sensor to a second temperature value for a second period of time,
- determine a second signal value by measuring the gas sensor signal during the second period of time, and
- calculate concentration information for the at least one gas based at least in part on:
- the first signal value and a first calibration relationship of the sensing unit at the first temperature value, and
- the second signal value and a second calibration relationship of the sensing unit at the second temperature value;
- and
- wherein the first temperature value is different than the second temperature value.
10 more elements
A method comprising:
- adjusting a temperature of a gas sensor to a first temperature value for a first period of time;
- determining a first signal value by measuring a gas sensor signal from the gas sensor during the first period of time;
- adjusting the temperature of the gas sensor to a second temperature value for a second period of time;
- determining a second signal value by measuring the gas sensor signal during the second period of time;
- calculating concentration information for at least one gas based at least in part on:
- the first signal value and a first calibration relationship of the gas sensor at the first temperature value, and
- the second signal value and a second calibration relationship of the gas sensor at the second temperature value;
- and
- wherein the first temperature value is different than the second temperature value.
6 more elements
A method comprising:
- creating, over a first period of time, a first state for a target environment;
- measuring, during the first period of time, a signal of a sensing unit to determine a first value of the signal;
- creating, over a second period of time, a second state for the target environment;
- measuring, during the second period of time, the signal of the sensing unit to determine a second value of the signal;
- calculating concentration information for at least one gas in the target environment based at least in part on the first value and the second value of the signal;
- wherein the first state is different than the second state;
- wherein the first state includes a first pressure of the target environment;
- and
- wherein the second state includes a second pressure of the target environment.
6 more elements
A method comprising:
- creating, over a first period of time, a first state for a target environment;
- measuring, during the first period of time, a signal of a sensing unit to determine a first value of the signal;
- creating, over a second period of time, a second state for the target environment;
- measuring, during the second period of time, the signal of the sensing unit to determine a second value of the signal;
- calculating concentration information for the at least one gas in the target environment based at least in part on the first value of the signal, the second value of the signal, and a plurality of calibration relationships of the sensing unit at the first state and the second state;
- and
- wherein the first state is different than the second state.
4 more elements
A method comprising:
- creating, over a first period of time, a first state for a target environment;
- measuring, during the first period of time, a signal of a sensing unit to determine a first value of the signal;
- creating, over a second period of time, a second state for the target environment;
- measuring, during the second period of time, the signal of the sensing unit to determine a second value of the signal;
- calculating concentration information for at least one gas in the target environment based at least in part on the first value and the second value of the signal;
- wherein the first state is different than the second state;
- wherein the target environment includes a first gas and a second gas;
- wherein the first value of the signal includes information about concentrations of the first gas and the second gas;
- wherein the second value of the signal includes information about concentrations of the first gas and the second gas;
- and
- wherein the concentration information for the at least one gas includes concentration information for the first gas and does not substantially include concentration information for the second gas.
8 more elements
A method comprising:
- creating, over a first period of time, a first bias voltage of a gas sensor in the sensing unit;
- measuring, during the first period of time, a signal of the sensing unit to determine a first value of the signal;
- creating, over a second period of time, a second bias voltage of the gas sensor in the sensing unit;
- measuring, during the second period of time, the signal of the sensing unit to determine a second value of the signal;
- calculating concentration information for at least one gas in a target environment based at least in part on the first value and the second value of the signal;
- and
- wherein the first bias voltage is different than the second bias voltage.
4 more elements
Dependencies are inferred from the claim text.