| Abstract from DBPedia | An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called black-body radiation emitted by the object being measured. They are sometimes called laser thermometers as a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns, to describe the device's ability to measure temperature from a distance. By knowing the amount of infrared energy emitted by the object and its emissivity, the object's temperature can often be determined within a certain range of its actual temperature. Infrared thermometers are a subset of devices known as "thermal radiation thermometers". Sometimes, especially near ambient temperatures, readings may be subject to error due to the reflection of radiation from a hotter body—even the person holding the instrument — rather than radiated by the object being measured, and to an incorrectly assumed emissivity. The design essentially consists of a lens to focus the infrared thermal radiation on to a detector, which converts the radiant power to an electrical signal that can be displayed in units of temperature after being compensated for ambient temperature. This permits temperature measurement from a distance without contact with the object to be measured. A non-contact infrared thermometer is useful for measuring temperature under circumstances where thermocouples or other probe-type sensors cannot be used or do not produce accurate data for a variety of reasons.放射温度計（ほうしゃおんどけい）は、物体から放射される赤外線や可視光線の強度を測定して、物体の温度を測定する温度計である。 これらの赤外線や可視光線といった熱放射は黒体放射によって生じ、温度と放出エネルギーとの関係を表すシュテファン＝ボルツマンの法則およびプランクの法則によって、物体の温度を算出することができるのを活用している(色温度)。 放射温度計の主な長所は、測定が高速に行えることと、非接触で測定可能な点である。非接触で測定可能なことは、熱伝導によって測定対象と温度計とが同じ温度になる必要がある多くの温度計・測定方法と違い、短時間で温度測定が可能となる要因ともなっている。 (Source: http://dbpedia.org/resource/Infrared_thermometer) |
