3. Acquire a Transient Thermoreflectance (TR) Measurement

3. Acquire a Transient Thermoreflectance (TR) Measurement

The Transient Thermoreflectance module acquires thermal imaging data for pulses between 50 µs and 5 ms; it is only available with the Visible Camera. Worked example (values as given in the source):

1. Turn off the "Int Vo 20mA Range" button in Project Manager.
2. Set the "DUT Pulse" control to the desired pulse width (500 µs in the source example).
3. Set "Voltage to Device" (6.0 V in the example) and select "Update Values."
   • Switch to "Thermal Imaging" mode.
   • Confirm the device is heating as expected for the 500 µs delay.
4. Set "Image Delay(s)" to 0 to initialize the delay to 0 µs. (A transient measurement can be started at any initial delay time.)
5. Go to File > Setup Sweep. [diagram/image in source — not reproduced here: Figure 6, Setup Sweep]
6. Enter "Number Delay Images" (51 in the example).
7. Enter "Delay Steps(s)" (10.0 µs in the example) — the software will take 51 images in 10 µs steps starting at 0 s (covering 0–500 µs).
8. Enter "Ave time per frame(s)" (5 s in the example) — the software averages for 5 s at each image.
9. Enter the Base File Name to save data under.
10. Select an ROI with the "Draw ROI" tool to monitor the temperature response of a region.
11. Press "Start." The software automatically steps through the thermal transient and shuts the device voltage off when finished; a thermal image is averaged and saved every 5 s in this example (255 s total for 51 data points ≈ 4 minutes 15 seconds).
12. Once the measurement finishes, exit and open the saved data in SanjANALYZER.

The transient response of an ROI can be monitored live in the lower-left "Region Mean Graph" tab by selecting a region with the Draw ROI tool. In the source's worked example, a small 5 µm Gold heater responds very quickly, reaching thermal equilibrium within a few microseconds due to its small thermal mass.

Reference — Timing Control: DUT pulse width, LED width, and acquisition period are set in this column. Acquisition period should be longer than DUT pulse width, which should be longer than LED width. Click "Update Timing" after changing any of these values.