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The Superior Performance and Reliability of NDK's QCMs
The QCM used for outgas evaluation is not merely a device that measures mass change. In material evaluation demanded by the extreme environment of space, "how accurately, stably, and reproducibly measurements can be made" is crucial.
As a specialist manufacturer of quartz devices, NDK pursues the high reliability and stability required for space applications. Through joint development with JAXA, we have realized a QCM outgas analysis system that withstands real-world use.
Why NDK's QCMs Are Chosen
As a dedicated manufacturer of crystal devices, NDK handles everything in-house--from producing the raw material, quartz crystal, to designing the resonators.
This deep expertise in the physical properties and behavior of quartz crystals, the core of QCM sensors, enables us to fundamentally support measurement accuracy and long-term stability.
High-Purity Synthetic Quartz is Used as the Material.
The quartz crystal, the core component of the sensor, is manufactured in-house. Crystals with minimal impurities support stable response and long-term reliability.
Synthetic Quartz Crystal
The Crystal Inside The Sensor
Measurement Stability via Twin Sensor Configuration
In QCM measurements, which are susceptible to temperature changes, the Twin configuration stabilizes the frequency difference between the measurement and reference signals.
The measured graph demonstrates that the frequency difference (blue line) remains constant even with temperature changes, enabling reliable desorption behavior analysis.
※The Twin sensor configuration also cancels frequency fluctuations caused by pressure variations, not just temperature changes, contributing to highly accurate mass change measurements in vacuum environments.
Red: Fundamental Frequency of the DET (detection side) Quartz Crystal
Black: Fundamental Frequency of the REF (reference side) Quartz Crystal
Blue: DET-REF Difference (Frequency Difference)
Enables real-time outgas measurement over extended periods.
【Example of 2-Week Continuous Measurement】
Week 1 Data
Week 2 Data
Red: Fundamental Frequency of the DET (detection side) Quartz Crystal
Black: Fundamental Frequency of the REF (reference side) Quartz Crystal
Blue: DET-REF Difference (Frequency Difference)
Wide-Range Temperature Control from -196°C to +125°C
Even when temperature is varied from -196°C to +125°C, the difference between the detection electrode and reference electrode remains within ±6 pm.
【 Frequency Temperature Characteristics of Modules 】
- Frequency fluctuation of each electrode is 800 ppm or more.
- Within ±6ppm by taking the difference
- Effect of temperature fluctuation 1/100 or less
The Crystal Inside the Sensor can be Replaced.
The crystal inside the sensor, which becomes contaminated during outgas measurements, is a consumable part and requires replacement. While other manufacturers may require replacing the entire sensor module,
NDK's design allows customers to easily replace it themselves.
→ Achieves approximately 1/10 cost reduction!
Crystal Section
Crystal Replacement Method
Vibration and Shock Resistance
Having passed the mechanical vibration and shock tests listed in Table 1, NDK's QCM sensors are also being considered for application in spaceflight models.
Twin-CQCM Sensor Cross-Section Diagram
【 Vibration and Shock Test Conditions 】
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For consultations regarding material evaluation and measurement methods, or for any technical questions, please feel free to contact us.
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