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TCD1304 Spectrometer Project Update: Calibration and Spectrum Demonstrations
0:05 Project Focus: This video updates the TCD1304 spectrometer project, focusing on software improvements, calibration using a fluorescent lamp, and demonstrating various light source spectra.
0:25 Hardware Base: The project uses a BMW Tech BTC 100 spectrometer housing, originally missing its lid and CCD.
0:35 Custom CCD Board: A custom PCB was designed for the TCD1304 linear CCD (3648 pixels), an upgrade from the original Sony ILX 511 (2048 pixels). This board has been revised and shrunk.
0:54 STM32 Integration: A version of the CCD board is designed to mount directly onto an STM32F411CEU6 microcontroller for compact operation.
1:19 PCB Availability: The custom CCD breakout boards can be ordered via the creator's PCBWay project page.
2:30 Optical Path: The spectrometer includes a 50-micron entrance slit, collimating mirror, 1800 lines/mm grating mirror, and a focusing mirror directing light onto the CCD.
3:12 Demonstrated Light Sources: The video showcases spectra from a fluorescent lamp (used for calibration), high-pressure sodium lamp, IKEA grow light, standard LED bulb, and an LED filament bulb.
4:36 Physical Demo: Light from a fluorescent lamp is shown passing through the spectrometer optics, creating visible green and orange spectral lines on paper placed before the CCD sensor location.
5:16 Custom Software: The creator demonstrates custom software featuring multiple modes (Single Exposure, Spectroscope, Scanner) for capturing and visualizing CCD data.
6:35 Baseline Subtraction: The software includes a baseline subtraction feature to remove the CCD's dark signal/offset for cleaner spectra.
8:00 Improved Calibration: The calibration algorithm was updated from a simple linear fit to a 3rd order polynomial fit using four distinct peaks from the fluorescent lamp spectrum, improving accuracy across the wavelength range.
9:36 Fluorescent Spectrum: The calibrated spectrum of the fluorescent lamp is captured, showing distinct emission peaks used for the calibration process.
12:32 LED Filament Spectrum: Shows a relatively smooth spectrum, weighted towards warmer colors, mimicking tungsten but much more efficient.
13:52 Standard LED Spectrum: Similar to the filament LED but dimmer, likely due to its opaque cover.
14:48 Tungsten Spectrum: Very low intensity captured due to using a low-wattage (11W) bulb (high-wattage incandescent bulbs are unavailable in Sweden), highlighting its inefficiency compared to LEDs.
16:16 Grow Light Spectrum: The IKEA grow light shows distinct spectra: the outer ring provides broad spectrum white light (strong blue peak, distributed green/red), while the inner ring adds a specific deep red peak.
18:04 Sodium Lamp Warm-up: The high-pressure sodium lamp spectrum is captured in real-time during its ~2-minute warm-up, showing characteristic spectral changes.
20:36 Sodium Peak Splitting: A key observation during warm-up is a prominent single peak splitting into a doublet as the lamp reaches operating temperature.
22:20 Laser Validation: The calibration accuracy is confirmed using red (650nm rated) and green (532nm rated) laser pointers, with measured peaks at 653.5nm and 532nm respectively, validating the fluorescent lamp calibration method.
25:42 Future Plans & Support: The creator asks for suggestions for future spectrometer applications and encourages viewers to support the channel and check his website for captured data and PCB links.