Detection means of the pan bottom temperature over the glass using the infrared sensor

Abstract

We studied the sensing technology that detected the pan bottom temperature through a top plate made of crystallized glass. We did the sensing with three sensors of the reflection sensor that measured the reflectance and the thermistor that agitation such as that at the top plate temperature of the thermopile and the pan bottom to detect radiant energy from the pan bottom and located it in the lower part of the top plate we were able to confirm that we could detect a different pan bottom temperature of the emittance at ±10°C by revision of the emittance using the reflection sensor output. As for the structure of the reflection sensor, the emission of light scattered the LED emission of light with a concave lens in the pan bottom side, irradiated it, and the light receiving region with to locate in the upper part of the emission of the light region. 40-60% of the heat agitation was included in the radiant energy that the thermopile that we placed in the lower part of the top-plate received. We were able to confirm that we could correct the heat agitation based on the correlation that we measured with the thermistor of the top-plate back side temperature and thermopile output. As a result of putting the pan bottom temperature sensing that put three sensors together on an induction cooktop, and having inspected the measurement accurately, we were able to confirm that we could detect the pan bottom temperature with an error of approximately ±10°C in the range of 140-260°C regardless of the emittance of the pan bottom.

Keywords

• induction cooktop
• thermopile
• infrared sensor
• temperature control