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How does emissivity affect infrared thermometers? Emissivity of common substances

Abstract: 红外测温仪是一种安全的非接触式测温工具,适用于食品检测、安检、火检等多个领域。激光指示有助于精确瞄准测试目标。发射率是描述材料辐射能量特性的指标,影响测温仪的测量准确度。大多数有机材料和涂有油漆或氧化的表面发射率约为0.95。发光或光滑金属表面会影响读数,应使用遮蔽材料进行校准。常见物质的发射率范围从0.70(纸)到0.98(冰),不同材料的发射率差异显著,这在测量时需要考虑。

The laser pointer can easily aim at the target and measure the temperature more accurately , making the work faster and more effective. It is a safe non-contact temperature measurement tool. Infrared thermometers are used for food inspection, security inspection, fire inspection, injection molding, painting, ink and diesel engine maintenance, etc.

locate hotspots

Point the meter at the desired test area, then scan the thermometer up and down until the hot spot of the test point is identified.

hint

①Do not use the meter to measure shiny or polished metal surfaces (stainless steel, aluminum, etc.) Refer to: emissivity

② Do not measure the instrument through a transparent surface (such as glass).

③Steam, dust, smoke, etc. will block the infrared rays of the instrument and affect the measurement accuracy.

emissivity

Emissivity describes the property of a material to radiate energy, and most (90%) organic materials and painted or oxidized surfaces have emissivity of 0.95. Measuring shiny metal surfaces may cause inaccurate readings. To make readings correct, cover the surface to be tested with masking tape or black paint. Wait for a period of time for the tape or paint to reach the same temperature as the surface it is covering, then measure the temperature of the tape or painted surface.

substanceemissivitysubstanceemissivity
asphalt0.90 to 0.98Cloth (black)0.98
concrete0.94human skin0.98
cement0.96soap bubbles0.75 to 0.80
sand0.90.charcoal (powder)0.96
soil0.92 to 0.96lacquerware0.80 to 0.95
water0.92 to 0.96 Lacquerware (matte)0.97
ice0.96 to 0.98Rubber (black)0.94
Snow0.83plastic0.85 to 0.95
Glass0.90 to 0.95wood0.9
ceramics0.90 to 0.94Paper0.70 to 0.94
marble0.94.Chromium oxide0.81
plaster0.80 to 0.90Copper oxide0.78
stucco0.89 to 0.91iron oxide0.78 to 0.82
brick0.93 to 0.96 textile0.9


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