Extended Data Fig. 4: Surface temperature measurement of the graded-pore carbon reactor.
From: Selective electrified polyethylene upcycling by pore-modulated pyrolysis
a, The surface temperature of the carbon pyrolysis reactor was measured using the optical two-color pyrometry method, which is based on Planck’s radiation law16. This method calculates temperature by analyzing radiation intensity at two wavelengths (650 nm and 750 nm), captured by a high-speed CMOS camera through bandpass filters. The camera’s measurements are synchronized and processed using a calibrated instrumental factor to determine the surface temperature. b, The temperature measurements of the three reactor zones over time clearly illustrate periodic fluctuations in surface temperature, as observed in the 3D graph. Additionally, the graph reveals a distinct temperature gradient across the three pyrolysis zones, indicating that each zone experiences a different temperature range, which is critical for optimizing the pyrolysis process and ensuring efficient heat distribution throughout the reactor. c, Characterization of the surface temperature at different time points. At the end of the 110 ms heating period, the temperature in the reactor reaches its maximum, with average peak temperatures in the three zones recorded as 630 °C, 525 °C, and 445 °C, respectively. Following 990 ms of cooling, the average surface temperatures decrease to 360 °C, 350 °C, and 330 °C across the same zones.
