Absolute humidity sensor

An absolute humidity sensor comprising:

• a temperature sensor placed in an environment allowing air to flow and configured to output a temperature signal as a sensor signal corresponding to temperature of air;
• a relative humidity sensor placed in the environment and configured to output a relative humidity signal as a sensor signal corresponding to relative humidity of air;
• and
• an absolute humidity acquisition unit configured to acquire absolute humidity of air from the temperature signal and the relative humidity signal, wherein
• the temperature sensor and the relative humidity sensor are placed at positions displaced in an upstream-downstream direction of a flow of air in the environment,
• the absolute humidity sensor further comprising:
• an advance adjustment unit configured
• to advance an output from a downstream sensor corresponding to one of the temperature sensor and the relative humidity sensor placed downstream and
• to reconcile change-behaviors of an output from the temperature sensor and an output from the relative humidity sensor in response to a state change in air, wherein
• the absolute humidity acquisition unit is configured to acquire the absolute humidity based on a sensor signal from an upstream sensor placed upstream and a sensor signal that is acquired from the downstream sensor and is advanced in the advance adjustment unit.

An absolute humidity sensor comprising:

• a temperature sensor placed in an environment allowing air to flow and configured to output a temperature signal as a sensor signal corresponding to temperature of air;
• and
• a relative humidity sensor placed in the environment and configured to output a relative humidity signal as a sensor signal corresponding to relative humidity of air, wherein
• the temperature sensor and the relative humidity sensor are placed at positions displaced in an upstream-downstream direction of a flow of air in the environment,
• one of the temperature sensor and the relative humidity sensor placed downstream is a downstream sensor, and
• an other of the temperature sensor and the relative humidity sensor placed upstream is an upstream sensor,
• the absolute humidity sensor further comprising:
• a processor configured to execute instructions to perform:
• reconciling change-behaviors of the sensor signal from the temperature sensor and the sensor signal from the relative humidity sensor in response to a state change in air by advancing the sensor signal from the downstream sensor or by delaying the sensor signal from the upstream sensor;
• and
• acquiring an absolute humidity of air based on the reconciled sensor signals.