Temperature Pyrometer Sara Gunnarsson Niklas Nilsson History - PowerPoint PPT Presentation

Temperature Pyrometer Sara Gunnarsson Niklas Nilsson

History Oldschool pyrometer - uses expanding metal bars

Optical pyrometer principle

Optical pyrometer principle

Simple radiation pyrometer

Photomultiplier tube ● Usable in wide ranges ● When a photon hits the electrode it emits an electron which multiplies and creates a current

Modern radiation pyrometer Stefan-Boltzmanns law Emissivity varies with wavelength and material ● Selective radiation pyrometer - one wavelength ● Total radiation pyrometer - all infrared wavelengths

Accuracy, connections, cost ● Many different types with different ranges ● Many handheld devices, some connected via USB or serial (RS232) for monitoring and configuration ● Price from 200 SEK depending on range and accuracy ● Range is roughly -20°C to 3000°C ● Accuracy usually from 0,1°C up to 0,5°C