TI DLP high-performance system for spectral analysis of liquids and solids

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TI DLP high-performance system for spectral analysis of liquids and solids [Copy link]

 

Spectroscopy is a powerful technique for identifying and characterizing physical substances through changes in the amount of light absorbed or emitted at different wavelengths. Spectroscopy requires the dispersion of light into a rainbow of wavelengths so that a systematic spectrum of light intensity at different wavelengths can be measured and recorded.

In a spectrometer, the TI DLP DMD (digital micromirror device) acts as a programmable wavelength filter. In a typical configuration, broadband light enters through a slit, and a grating is used to disperse the wavelengths of light passing through the micromirror array. The micromirror columns are then used to select which wavelengths are directed onto a single element detector, while the micromirror rows apply an attenuation factor. The DMD replaces the expensive array detector with a larger single detector, making the spectrometer architecture much simpler to implement.

This powerful design architecture uses a smaller form factor to achieve higher performance in liquid and solid analysis at a lower price point while meeting the needs of field analysis and embedded manufacturing processes.

Features and Benefits

performance:

- Capture more light from the sample

- Better signal-to-noise ratio (SNR)

-Low power consumption, more portable solution

Programmability:

-More flexible, fast and accurate measurement

- "Optimization on the fly" analysis

-Measure multiple substances with a single terminal device

cost:

-Use lower cost single element detector

-Consistent single-piece performance in mass production

Portability:

- Robust and durable structure

-Switching characteristics not affected by temperature

DLP Solutions for Spectroscopic Analysis

DLP solutions offer high performance and system programmability to optimize different spectral analysis designs. Choosing the most appropriate DLP chipset depends on the requirements of the spectral analysis system, such as the wavelength range to be measured, the required wavelength resolution, and the spectral measurement capture speed. TI provides free software and firmware downloads; this enables developers to easily create, store, and display high-speed graphic sequences through a USB-based application programming interface (API) and an easy-to-use graphical user interface (GUI).

Application Examples

Gas detection, skin analysis, chemical sensing, material identification, oil & water quality testing

Recommended products

Evaluation Module

The DLP NIRscan is a complete evaluation module (EVM) for designing high-performance, affordable near-infrared spectrometers. The EVM features the DLP4500NIR DMD and is optimized for material sensing in the 1350-2450nm wavelength range.

The DLP NIRscan Nano EVM provides a portable, battery-powered solution for spectral analysis system designs. This Bluetooth-enabled EVM features the DLP2010NIRDMD and is optimized for material sensing in the 900-1700nm wavelength range.

System Block Diagram

TI components address many design considerations. The TI embedded processor controls the DMD controller to only turn on the high-precision micromirrors illuminated by the specific wavelength of light being measured at each instant. The processor's easy programmability allows users to set specific column widths (wavelength ranges) or other patterns for their spectral analysis requirements. In addition, the use of TITEC drivers and ADCs is recommended to achieve high signal-to-noise ratio values.

Optical analysis of liquids and solids

To enable users to bring products to market faster, Texas Instruments (TI) also provides a reference design for spectroscopy applications. The NIR spectrometer reference design uses DLP technology together with a single-element InGaAs detector to provide high-performance measurements in portable applications; compared to expensive InGaAs array detectors or fragile rotating grating architectures, this portable system is more affordable.

Click here to quickly view the TI DLP technology zone, which can help you learn more about the latest information on DLP chipset applications.