Temperature measurement with a Pyromter

In summary, the conversation discusses the use of a near infrared pyrometer to measure the temperature of a metal surface surrounded by glass. The possibility of the glass affecting the accuracy of the measurement is raised, with a suggestion to test the glass's effect by taking a reading with and without the glass. The speaker also mentions the use of a thermocouple to calibrate the sample and obtain an effective emissivity.
  • #1
long qi
1
0
I want to measure the temperature of a metal surface surrounded by glass with a near infrared pyrometer(1.45 micron to 1.7 micron). I am not sure the influence of the glass on the measuremental accuracy. You know the infrared radiation may be absorbed by the glass to make uncertainty.

Please give me some advices on this issue.
 
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  • #2
Welcome to PF.

Depending on the type of glass, the transmission is likely 90%, give or take a few %, over that range. That means the reading will be about 2% to 4% lower than the actual temperature, on an absolute (eg. Kelvin) temperature scale. (Based on the T4 dependence of radiation.)

Do you have a sample of the same glass, without the metal in it? You can test the glass's effect by taking a reading, then hold the test glass in front of the pyrometer and take another reading. See how much the reading drops, and add that number to the original reading.
 
  • #3
I've done similar measurements using infrared cameras. It's not a clean measurement- what kind of accuracy are you going for?

The best solution is to 'calibrate' the sample using a thermocouple to obtain an effective emissivity.
 

What is a Pyrometer and how does it measure temperature?

A Pyrometer is a non-contact temperature measurement device that uses infrared technology to measure the temperature of an object. It works by detecting and measuring the thermal radiation emitted by an object, and then converting it into a temperature reading.

What are the advantages of using a Pyrometer over traditional thermometers?

Pyrometers offer several advantages over traditional thermometers. They can measure temperature without touching the object, making them ideal for measuring high temperatures or objects that are difficult to access. They also have a faster response time and can measure a wider range of temperatures.

How accurate is a Pyrometer in temperature measurement?

The accuracy of a Pyrometer depends on several factors, such as the type of Pyrometer used, the distance from the object being measured, and the emissivity of the object. Generally, modern Pyrometers have a high level of accuracy, with some models being able to measure temperature with an accuracy of up to 0.1 degrees Celsius.

What are the applications of Pyrometers in different industries?

Pyrometers have a wide range of applications in various industries, including metalworking, glass manufacturing, food processing, and automotive. They are commonly used for monitoring and controlling temperature in industrial processes, as well as for quality control and safety purposes.

What are the precautions to take when using a Pyrometer for temperature measurement?

Some precautions to take when using a Pyrometer include ensuring that the Pyrometer is calibrated correctly, selecting the appropriate Pyrometer for the temperature range being measured, and considering the emissivity of the object being measured. It is also important to follow the manufacturer's instructions and safety guidelines to avoid any accidents or damage to the Pyrometer.

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