Temperature estimation method, temperature estimation program and temperature estimation device

A temperature estimation apparatus comprising:

• a first thermal resistance member;
• a first temperature sensor on a surface of the first thermal resistance member configured to face a test subject;
• an actuator configured to bring the first thermal resistance member and the first temperature sensor into contact with the test subject and separate the first thermal resistance member and the first temperature from the test subject;
• a normalized temperature calculation circuit configured to calculate, for each time the first thermal resistance member and the first temperature sensor come into contact with the test subject, a normalized temperature by normalizing an instantaneous value of a temperature of a surface of the test subject measured by the first temperature sensor by a temperature of the first thermal resistance member measured by the first temperature sensor before the contact and a setting value of the temperature of the surface of the test subject after the contact;
• a temperature wave arrival time derivation circuit configured to derive, as a temperature wave arrival time, a time from a time point at which the first thermal resistance member and the first temperature sensor come into contact with the test subject until the normalized temperature reaches a threshold value;
• a proportionality coefficient derivation circuit configured to derive a proportionality coefficient based on the temperature wave arrival time;
• a second thermal resistance member configured to contact the test subject;
• a second temperature sensor on a surface of the second thermal resistance member on a test subject side and configured to measure the temperature of the surface of the test subject;
• a third temperature sensor on a surface of the second thermal resistance member on a side opposite to the surface on the test subject side of the second thermal resistance member and configured to measure a temperature at a position away from the test subject;
• and
• a temperature calculation circuit configured to calculate an internal temperature of the test subject based on the measurement results of the second and third temperature sensors after the first thermal resistance member and the first temperature sensor are separated from the test subject and the proportionality coefficient.

A temperature estimation method comprising:

• bringing a first thermal resistance member into contact with a test subject;
• measuring a first temperature of a surface of the test subject;
• calculating a temperature normalized by an instantaneous value of the first temperature of the surface of the test subject and a temperature of the first thermal resistance member and a setting value of the temperature of the surface of the test subject;
• deriving, as a temperature wave arrival time, a time from a time point at which the first thermal resistance member comes into contact with the test subject until the normalized temperature reaches a threshold value;
• deriving a proportionality coefficient based on the temperature wave arrival time;
• separating the first thermal resistance member from the test subject;
• measuring a second temperature of the surface of the test subject;
• measuring a third temperature of a surface of a second thermal resistance member on a side opposite to a surface of the second thermal resistance member on a test subject side;
• and
• calculating an internal temperature of the test subject based on the second temperature, the third temperature, and the proportionality coefficient.