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[heavy] Jianzhi instrument MOEMS array spot detection technology
In recent years, Raman spectroscopy has become a widely adopted rapid inspection technology in fields such as food safety, biomedicine, molecular structure analysis, chemical processes, biochemistry, archaeological and cultural relic identification, public security, legal sample analysis, anti-terrorism, and more. Known as "molecular fingerprinting," Raman spectroscopy is highly valued in optical inspection due to its non-destructive, convenient, fast, and stable characteristics.
However, the traditional Raman method relies on focused measurement, which requires careful handling when detecting certain samples. According to the object-image conjugate relationship, only the optical signals emitted from the slit image point can be captured by the spectrometer. Therefore, the Raman signal achieves maximum collection efficiency when the excitation laser is precisely focused at this position. To achieve higher resolution, the dispersive spectrometer's slit is usually just a few tens of micrometers wide, making it necessary to focus the laser during Raman detection. While this is convenient for some applications, such as analyzing cell bodies in natural gemstones, high focus often leads to other issues.
For example, with dark materials that absorb most of the laser power, there is a risk of burning the sample. When measuring cultural relics or paintings, there is a potential for damage. In the case of explosives like black powder, potassium chlorate, or potassium perchlorate, there is even a risk of direct detonation. These challenges are illustrated below.
[Image: A diagram showing the risks of focusing laser on sensitive samples]
Additionally, due to the nature of Raman spectroscopy, only "point measurement" is possible. This can raise concerns about the representativeness of the data when analyzing non-uniform samples. For instance, if you're testing a jade bracelet that has been glued, but the measurement spot doesn't hit the glue, it might be misclassified as genuine jade. Similarly, when analyzing multi-component solid drugs, the measurement might only detect the auxiliary materials and not the actual drug. This issue is shown below.
[Image: An example of incorrect classification due to point measurement]
To address these challenges, several technologies have emerged:
First, the ORS moving spot technology reduces the exposure time of the laser at a single location to avoid igniting the sample. However, the mechanical movement of the spot is often uneven, leading to localized heating that can still cause damage. The optomechanical design also increases complexity and reduces reliability.
Second, TRS transmission technology requires large, flaky samples and is limited by numerical aperture, resulting in lower optical efficiency and a smaller measurement range.
Third, the "large spot" technique uses a non-focused approach, increasing the illumination area. However, this violates the focus measurement principle, causing significant loss in light collection efficiency, even with reflective cavities added.
All three methods can expand the spot size to the millimeter level, which is still too small for many practical applications. Moreover, the latter two techniques significantly reduce optical efficiency, leading to signal degradation and difficulty in distinguishing samples.
How can we achieve large-area Raman features with uniform laser distribution without sacrificing optical efficiency? Inspired by the compound eyes of insects, scientists developed the "flying eye camera," capable of capturing a 160-degree field of view and focusing on multiple depths simultaneously.
By mimicking the compound eye structure, we can create an array of tiny lenses that distribute the excitation light evenly across the focal plane. Each lens functions as an independent optical system, allowing coverage of a wide detection area and enabling "surface measurement" instead of "point measurement."
This is the first MOEMS array spot detection technology introduced by Jianzhi Instruments. It not only prevents sample damage caused by high focus but also transforms Raman detection from "point measurement" to "surface measurement." Based on their own component-level R&D capabilities, Jianzhi optimized traditional Raman systems by replacing single lenses with array microlenses and redesigning the optical path. Their bionic MOEMS Raman probe extends the detection range to centimeters, reducing spot energy by 1-2 orders of magnitude while maintaining high numerical aperture and receiving efficiency.
With hundreds of evenly distributed spots, the laser power is shared, enabling safe, large-area detection. Especially for dangerous samples, the single-point power is less than 5 mW, ensuring absolute safety and eliminating the risk of burning or detonating hazardous materials.
This technology solves the issue of representative sampling in mixed substances like drugs and prevents ablation in high-absorption materials such as black powder or ABS. It allows safe and effective Raman detection of flammable targets and enables low-energy, large-area Raman analysis—an innovative leap from traditional methods.
Jianzhi Instruments unveiled this new technology at the On-Site Rapid Inspection Technology Development Summit Forum and the 2019 Brief Wisdom New Product Conference, marking a breakthrough in Raman fast inspection. In 2019, the new Easy-Raman EV series handheld Raman products will feature MOEMS array spot detection technology—stay tuned for more updates!