سنسور  TS118-3 از سری سنسور های اندازه گیری دما (Thermometer) بدون تماس با جسم مورد نظر و از راه دور بوسیله مادون قرمز(Infra Red) می باشد. از مشخصات جالب این سنسور علاوه بر این که برای اندازه گیری دما نیازی به تماس با جسم مورد نظر ندارد. دقت و حساسیت بالای سنسور  از مزایای این سنسور می باشد. کاربرد این سنسور در ربات ها امدادگر ، نظامی ، صنعت ، کشاورزی ، پزشکی، معادن و ... می باشد.

Introduction

The OTP-538U is a thermopile sensor in classic TO-46 housing. The sensor is composed of 116
elements of thermocouple in series on a floating micro-membrane having an active diameter of 545
μm and with blacken surface to absorb the incident thermal infrared radiation, which induces a
voltage response at output terminals. The sensor chip is fabricated by a unique front-surface bulk
micromachining technology, which result in smaller size and faster to response ambient
temperature change.
The IR window is a bandpass filter having its 50% cut-on wavelength at 5 μm, and cut-down at
14μm. The sensor responses proportionally to the incident IR radiation and has a constant signal
response up to its cut-off frequency, which is limited by the sensor thermal time constant of tens
millisecond range.
The OTP-538U thermopile sensor provides nearly Johnson-noise-limited performance, which can
be calculated by its ohmic series resistance. A thermistor element, with a lead connected to
ground, is also provided inside the TO package for ambient temperature reference

Features

• Non-contact temperature detection
• Voltage output, easy to take signal
• Zero power consumption
• Wide detection temperature range