If you want to build your own thermal image camera you can do that on the cheap, you don't even need a raspberry Pi, just buy a GY-MCU90640 (double check that it has two lines of pins, the mportan ones are the RX and the TX pins) because that camera uses a serial port to transfer the information, and you can read it with a standard usb to ttl. It's very cheap and you can use it for basic tasks, I use to find shorts on electronics repairs

You have to use that python script and change the line to use usbTTY0 instead of serial0

https://github.com/vvkuryshev/GY-MCU90640-RPI-Python

GitHub - vvkuryshev/GY-MCU90640-RPI-Python: The script to connect the thermal image module GY-MCU90640 to Raspberry Pi.

The script to connect the thermal image module GY-MCU90640 to Raspberry Pi. - vvkuryshev/GY-MCU90640-RPI-Python

GitHub