TP-X combines thin-film thermistor technology with silicon micro-machining.
This new thermopile design provides rapid, accurate detection even in a fluctuating temperature environment. TP-X is compliant with EN12470-5.

Infrared sensor of thermopile is developed by Ishizuka Electronics Corporation using its own technologies of both high-precision thermistor and micromachining.

Features

• Less temperature coefficient against responsivity
• Tight B-value tolerance of thermistor built-in : ±0.2%
• High output voltage & quick response

Applications

• Eardrum Thermometer
• Radiation Thermometer
• Microwave Oven
• Air Conditioner

Structure

Operating Principles

Thermopile is organized with a number of thermocouples connected in series, which thermocouples are made of thin films.
When the heat absorber receives infrared rays, the infrared rays are transduced into heat there. Then the temperature of the membrane is raised.
Thermocouples of thin films generate certain voltage depends on temperature.

Non-Contact Thermometer

• All objects radiate infrared rays in proportional to the absolute temperature.
• Non-contact measuring of temperature is achieved by measuring the amount of infrared rays.
• In general, a relation between object’s temperature and the amount of infrared rays can be given from the equation of TB4-TS4 (Stefan-Boltzmann Law) .
• From output voltage of the thermopile and resistance of the thermistor, the temperature of object is calculated with this equation.

Temperature Measurement of Eardrum

An application for Eardrum Thermometer

Block Diagram of Eardrum Thermometer & Calibration System

Structure of Calibration System

Tolerance of B-value vs. Temperature Error