CDM integrated thickness & surface density gauge


Coating process: on-line detection of small features of electrode; common small features of electrode: holiday starving (no leakage of current collector, small gray difference with normal coating area, failure of CCD identification), scratch, thickness contour of thinning area, AT9 thickness detection etc.

Product Detail

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Principles of measurement

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Principles of surface density measurement

X/β-ray absorption method

Principles of thickness measurement

Correlation & laser triangulation

CDM technical testing characteristics

Scenario 1: There is 2 mm wide holiday/ shortage on the electrode surface and one edge is thicker (blue line as shown below). When the ray spot is 40 mm, the impact of the measured original data shape (orange line as shown below) looks smaller obviously.


Scenario 2: profile data of dynamic thinning area 0.1mm data width

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Software features

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Technical parameters

Name Indexes
Scanning speed 0-18m/min
Sampling frequency Surface density: 200 kHz; thickness: 50 kHz
Range of surface density measurement Surface density: 10~1000 g/m²; thickness: 0~3000 μm;
Measurement repetition
Surface density:
16s integral: ±2σ: ≤±true value * 0.2‰ or ±0.06g/m²;
 ±3σ:≤±true value * 0.25‰ or +0.08g/m²;
4s integral: ±2σ: ≤±true value * 0.4‰ or ±0.12g/m²;
 ±3σ: ≤±true value * 0.6‰ or ±0.18g/m²;Thickness:
10 mm zone:±3σ: ≤±0.3μm;
1 mm zone: ±3σ: ≤±0.5μm;
0.1 mm zone: ±3σ: ≤±0.8μm;
Correlation R2 Surface density >99%; thickness >98%;
Laser spot 25*1400μm
Radiation protection class GB 18871-2002 national safety standard (radiation exemption)
Service life of radioactive
β-ray: 10.7 years (Kr85 half-life); X-ray: > 5years
Response time of measurement Surface density < 1ms; thickness < 0.1ms;
Overall power <3kW

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