Overview

This user manual describes the usage procedures, precautions, and other information regarding D6T-series MEMS Thermal Sensors. This document also serves as a supplement to the product catalog. Reference this document together with the product catalog when using this device.

Product Description

MEMS Thermal Sensors measure the surface temperature of objects. The D6T series consists of a small circuit board onto which a silicon lens, thermopile sensor, specialized analog circuit, and logic circuit for conversion to a digital temperature value are arranged. This product only requires one connector to connect these modules. The module has been optimized by placing the specialized downstream processing circuit adjacent to the sensor chip to achieve low-noise temperature measurements. Using our MEMS Thermal Sensors as a human sensor eliminates the problems in using conventional pyroelectric sensors to detect the presence of people. Pyroelectric sensors can be used to detect movement of people based on the principle of detecting change components of infrared rays, but the measurement signal is lost during times of no movement. Conversely, Thermal Sensors continue to generate a measurement signal during times of no movement. The sensitive areas of elements are wider than the FOV-specification width. If the size of the measured object is smaller than the sensitive area of an element, the background temperature of objects other than the intended object will become a factor. Our Thermal Sensors use a reference heat source (a blackbody furnace) to correct temperature values. However, note that differences in emissivity due to composition of measured objects, surface shape, and the occupancy ratio of objects within sensitive areas all affect temperature values. The measurable area (FOV) enlarges as the distance between the measured object increases. The occupancy ratio of objects (people) in the FOV reduces as the distance increases. For this reason, as the distance increases, the temperature values become more a representation (level of influence) of the background temperature than the temperature of the intended object (people). In other words, to correctly measure temperature of the intended objects, the measured object must be sufficiently larger than the FOV area. Using a MEMS Thermal Sensor as a human sensor is limited to close-distance applications for simple determination of temperature value only. To increase the detection distance, determination accuracy must be improved through software processing that factors temporal changes, position of heat sources, human behavior information, and so on.

Product Attributes

• Brand: Omron (implied by product name D6T)
• Material: Silicon lens, circuit board
• Usage: Measuring surface temperature of objects, human sensing
• Advantages: Continuous measurement signal generation (unlike pyroelectric sensors), low-noise temperature measurements
• Application Scenarios: Close-distance applications for simple determination of temperature value, human sensing

Technical Specifications