Abstract

In this paper, we report the design of a system equipped with a multielement thermopile for monitoring the temperature of indoor objects. We evaluate the performance of our measurement system, which comprises two microcontrollers, an analog-to-digital converter, two stepping motors, and four microswitches. We use an RS-232 or a wireless RS-232 interface that transmits temperature values and uses colors to indicate the temperature range on a PC screen. The system is inexpensive and can be used for three-dimensional temperature measurements. The effective detection range of this system is from −20°C to 120°C or 180°C; the measurement error is within ±1°C. Experimental results demonstrate the effectiveness of the system for monitoring temperatures of remote indoor objects. Hence, it is possible to identify a hot spot in electrical heating equipment, a smoldering source hidden in upholstery, or the activities of a person in a room.

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