GB/T 41760-2022 in English

Analysis of the key points of national standard technical specifications

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In-depth interpretation of the core test principle

Based on the structural characteristics of the charge integration method tester, the temperature program control unit causes the tourmaline powder to produce pyroelectric effect, and then establishes a quantitative analysis model through the relationship C_f=ΔU₀×A / ΔP_s. Experiments have shown that the change law of polarization charge in the range of -50℃~250℃ can be effectively captured at a temperature control accuracy of 3℃/minute.

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Comparative Analysis of Core Technical Indicators

Instrument Components	Accuracy Requirements	Measurement Range
Temperature Sensor	±0.1℃	-50℃~250℃
Laser Particle Size Analyzer	D50≤3μm	0.1-1000μm
Charge Amplifier	±0.5pC Resolution	0.01Hz-10kHz

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Standardized control of the test process

The sample must be completely dried at 105℃ in an environment with (50±5)% humidity. The median particle size of the powder must be controlled to R_D50≤3μm. After three parallel tests, the scientific counting method is used for characterization, and the relative deviation threshold is strictly controlled within 3.0%.

Technological innovation and evolution of standards

Compared with FTIR spectroscopy, the uniqueness of the charge integration method is reflected in:
• The surface charge measurement sensitivity is improved by 2 orders of magnitude
• The temperature control accuracy is optimized from ±5℃ to ±1℃
• Abandoning traditional manual calculations to achieve automatic quantitative fitting of P_s

Key points for experimental operation

{"Implementation suggestions":["Ensure that the measurement unit is fully preheated for 15 minutes","Follow the gain setting of 0.01mV/pC","The grounding impedance of the shielding device is ≤4Ω","Calibrate the RC value of the integration circuit every month"]}