Method of calibrating a radiation thermometer

A method of calibrating a radiation thermometer including a radiation sensor and a temperature-responsive resistor that serves as an ambient temperature sensor, wherein the temperature-responsive resistor has at a specified temperature a reference resistance R0 and a temperature dependence that is characterized by a linear temperature coefficient, said method comprising:

• using a first radiation standard having a known temperature TS(1);
• while the ambient temperature sensor is at a first ambient temperature TU, using the radiation thermometer to read the temperature of the first radiation standard;
• while using the radiation thermometer to read the temperature of the first radiation standard, measuring a first output signal U(1) of the radiation sensor;
• using a second radiation standard having a known temperature TS(2);
• while the ambient temperature sensor is at said first ambient temperature TU, using the radiation thermometer to read the temperature of the second radiation standard;
• while using the radiation thermometer to read the temperature of the second radiation standard, measuring a second output signal U(2) of the radiation sensor;
• measuring a resistance R(TU) of the ambient temperature sensor at said first ambient temperature TU;
• using a third radiation standard having a known temperature TS(3);
• while the ambient temperature sensor is at a second ambient temperature TU′, using the radiation thermometer to read the temperature of the third radiation standard;
• while using the radiation thermometer to read the temperature of the third radiation standard, measuring a third output signal U(3) of the radiation sensor;
• using a fourth radiation standard having a known temperature TS(4);
• while the ambient temperature sensor is at said second ambient temperature TU′, using the radiation thermometer to read the temperature of the fourth radiation standard;
• while using the radiation thermometer to read the temperature of the fourth radiation standard, measuring a fourth output signal U(4) of the radiation sensor;
• measuring a resistance R(TU′) of the ambient temperature sensor at said second ambient temperature TU′;
• and
• calibrating the ambient temperature sensor by using TS(1), TS(2), TS(3) and TS(4) and the values obtained for U(1), U(2), U(3) and U(4) and without using any values for TU and TU′ that are derived from measuring an output of the ambient temperature sensor, and wherein the step of calibrating involves calculating the first and second ambient temperatures TU and TU′ and calculating the reference resistance R0 and the linear temperature coefficient of the temperature-responsive resistor by using the calculated first and second ambient temperatures TU and TU′.

A method of calibrating a radiation thermometer including a radiation sensor and a temperature-responsive resistor that serves as an ambient temperature sensor, wherein the temperature-responsive resistor has at a specified reference temperature a reference resistance R0 and a temperature dependence that is characterized by a linear temperature coefficient and a quadratic temperature coefficient, said method comprising:

• using a first radiation standard having a known temperature TS(1);
• while the ambient temperature sensor is at a first ambient temperature TU, using the radiation thermometer to read the temperature of the first radiation standard;
• while using the radiation thermometer to read the temperature of the first radiation standard, measuring a first output signal U(1) of the radiation sensor;
• using a second radiation standard having a known temperature TS(2);
• while the ambient temperature sensor is at said first ambient temperature TU, using the radiation thermometer to read the temperature of the second radiation standard;
• while using the radiation thermometer to read the temperature of the second radiation standard, measuring a second output signal U(2) of the radiation sensor;
• measuring a resistance R(TU) of the ambient temperature sensor at said first ambient temperature TU;
• using a third radiation standard having a known temperature TS(3);
• while the ambient temperature sensor is at a second ambient temperature TU′, using the radiation thermometer to read the temperature of the third radiation standard;
• while using the radiation thermometer to read the temperature of the third radiation standard, measuring a third output signal U(3) of the radiation sensor;
• using a fourth radiation standard having a known temperature TS(4);
• while the ambient temperature sensor is at said second ambient temperature TU′, using the radiation thermometer to read the temperature of the fourth radiation standard;
• and
• while using the radiation thermometer to read the temperature of the fourth radiation standard, measuring a fourth output signal U(4) of the radiation sensor;
• measuring a resistance R(TU′) of the ambient temperature sensor at said second ambient temperature TU′;
• using a fifth radiation standard having a known temperature TS(5);
• while the ambient temperature sensor is at a third ambient temperature TU″, using the radiation thermometer to read the temperature of the fifth radiation standard;
• while using the radiation thermometer to read the temperature of the fifth radiation standard, measuring a fifth output signal U(5) of the radiation sensor;
• using a sixth radiation standard having a known temperature TS(6);
• while the ambient temperature sensor is at said third ambient temperature TU″, using the radiation thermometer to read the temperature of the sixth radiation standard;
• while using the radiation thermometer to read the temperature of the sixth radiation standard, measuring a sixth output signal U(6) of the radiation sensor;
• measuring a resistance R(TU″) of the ambient temperature sensor at said third ambient temperature TU″;
• and
• calibrating the ambient temperature sensor by using TS(1), TS(2), TS(3), TS(4), TS(5) and TS(6) and the values obtained for U(1), U(2), U(3), U(4), U(5) and U(6) and without using any values for TU, TU′, and TU″ that are derived from measuring an output of the ambient temperature sensor and wherein the step of calibrating involves calculating the first, second and third ambient temperatures, and calculating the reference resistance R0 and the linear temperature coefficient and the quadratic temperature coefficient of the temperature-responsive resistor by using the calculated first, second and third ambient temperatures TU, TU′, and TU″.

A method of calibrating a radiation thermometer including a radiation sensor and an ambient temperature sensor, wherein the ambient temperature sensor outputs at a specified reference temperature a reference output value R0 and has a temperature dependence that is characterized by a linear temperature coefficient, said method comprising:

• using a first radiation standard having a known temperature TS(1);
• while the ambient temperature sensor is at a first ambient temperature TU, using the radiation thermometer to read the temperature of the first radiation standard;
• while using the radiation thermometer to read the temperature of the first radiation standard, measuring a first output signal U(1) of the radiation sensor;
• using a second radiation standard having a known temperature TS(2);
• while the ambient temperature sensor is at said first ambient temperature TU, using the radiation thermometer to read the temperature of the second radiation standard;
• while using the radiation thermometer to read the temperature of the second radiation standard, measuring a second output signal U(2) of the radiation sensor;
• measuring the output value R(TU) of the ambient temperature sensor at said first ambient temperature TU;
• using a third radiation standard having a known temperature TS(3);
• while the ambient temperature sensor is at a second ambient temperature TU′, using the radiation thermometer to read the temperature of the third radiation standard;
• while using the radiation thermometer to read the temperature of the third radiation standard, measuring a third output signal U(3) of the radiation sensor;
• using a fourth radiation standard having a known temperature TS(4);
• while the ambient temperature sensor is at said second ambient temperature TU′, using the radiation thermometer to read the temperature of the fourth radiation standard;
• while using the radiation thermometer to read the temperature of the fourth radiation standard, measuring a fourth output signal U(4) of the radiation sensor;
• measuring the output value R(TU′) of the ambient temperature sensor at said second ambient temperature TU′;
• and
• calibrating the ambient temperature sensor by using TS(1), TS(2), TS(3), TS(4) and the values obtained for U(1), U(2), U(3) and U(4) and without using any values for TU and TU′ that are derived from measuring an output of the ambient temperature sensor, and wherein the step of calibrating involves calculating the first and second ambient temperatures TU, TU′ and calculating the reference output value R0 and the linear temperature coefficient of the ambient temperature sensor by using the calculated first and second ambient temperatures TU, TU′.

A method of calibrating a radiation thermometer including a radiation sensor and an ambient temperature sensor, wherein the ambient temperature sensor outputs at a specified reference temperature a reference output value R0 and has a temperature dependence that is characterized by a linear temperature coefficient and a quadratic temperature coefficient, said method comprising:

• using a first radiation standard having a known temperature TS(1);
• while the ambient temperature sensor is at a first ambient temperature TU, using the radiation thermometer to read the temperature of the first radiation standard;
• while using the radiation thermometer to read the temperature of the first radiation standard, measuring a first output signal U(1) of the radiation sensor;
• using a second radiation standard having a known temperature TS(2);
• while the ambient temperature sensor is at said first ambient temperature TU, using the radiation thermometer to read the temperature of the second radiation standard;
• while using the radiation thermometer to read the temperature of the second radiation standard, measuring a second output signal U(2) of the radiation sensor;
• measuring the output value R(TU) of the ambient temperature sensor at said first ambient temperature TU;
• using a third radiation standard having a known temperature TS(3);
• while the ambient temperature sensor is at a second ambient temperature TU′, using the radiation thermometer to read the temperature of the third radiation standard;
• while using the radiation thermometer to read the temperature of the third radiation standard, measuring a third output signal U(3) of the radiation sensor;
• using a fourth radiation standard having a known temperature TS(4);
• while the ambient temperature sensor is at said second ambient temperature TU′, using the radiation thermometer to read the temperature of the fourth radiation standard;
• while using the radiation thermometer to read the temperature of the fourth radiation standard, measuring a fourth output signal U(4) of the radiation sensor;
• measuring the output value R(TU′) of the ambient temperature sensor at said second ambient temperature TU′;
• using a fifth radiation standard having a known temperature TS(5);
• while the ambient temperature sensor is at a third ambient temperature TU″, using the radiation thermometer to read the temperature of the fifth radiation standard;
• while using the radiation thermometer to read the temperature of the fifth radiation standard, measuring a fifth output signal U(5) of the radiation sensor;
• using a sixth radiation standard having a known temperature TS(6);
• while the ambient temperature sensor is at said third ambient temperature TU″, using the radiation thermometer to read the temperature of the sixth radiation standard;
• while using the radiation thermometer to read the temperature of the sixth radiation standard, measuring a sixth output signal U(6) of the radiation sensor;
• measuring the output value R(TU″) of the ambient temperature sensor at said third ambient temperature TU″;
• and
• calibrating the ambient temperature sensor by using TS(1), TS(2), TS(3), TS(4), TS(5), TS(6) and the values obtained for U(1), U(2), U(3), U(4), U(5) and U(6) and without using any values for TU, TU′ and TU″ that are derived from measuring an output of the ambient temperature sensor and wherein the step of calibrating involves calculating the first, second and third ambient temperatures TU, TU′, TU″ and calculating the reference output value R0 and the linear temperature coefficient and the quadratic temperature coefficient of the ambient temperature sensor by using the calculated first, second and third ambient temperatures TU, TU′, TU″.