INDUSTRY COMPONENT

Backing Layer

Backing layer is a damping component in ultrasonic transducers that absorbs backward energy to improve pulse response and resolution.

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Component Specifications

Definition
The backing layer is a critical component in ultrasonic transducer arrays, positioned behind the piezoelectric element. It serves as an acoustic impedance matching and damping material that absorbs backward-propagating acoustic energy from the piezoelectric element. This absorption reduces ringing effects, shortens pulse duration, improves axial resolution, and enhances bandwidth. The backing layer's properties directly impact transducer sensitivity, signal-to-noise ratio, and image quality in medical imaging and industrial testing applications.
Working Principle
The backing layer operates on acoustic impedance matching and energy dissipation principles. When the piezoelectric element generates ultrasonic waves, some energy propagates backward. The backing layer, with carefully engineered acoustic impedance and high attenuation coefficient, absorbs this backward energy through internal friction and scattering mechanisms. This converts acoustic energy into heat, preventing reflections that would cause prolonged vibration (ringing) and thus enabling cleaner, shorter pulses for improved temporal resolution.
Materials
Typically composed of epoxy resin matrix with tungsten or other heavy metal powder fillers (60-80% by volume). Alternative materials include silicone rubber with ceramic particles or specialized polymer composites. Key specifications: density 3-8 g/cm³, acoustic impedance 5-15 MRayl, attenuation coefficient >10 dB/cm at operating frequency.
Technical Parameters
  • Density 4-7 g/cm³
  • Thickness 5-20 mm (matched to quarter wavelength)
  • Acoustic Impedance 6-12 MRayl
  • Thermal Conductivity 0.5-2.0 W/m·K
  • Operating Temperature -20°C to 80°C
  • Attenuation Coefficient 15-30 dB/cm @ 5 MHz
Standards
ISO 18563-1, IEC 62127-1, ASTM E1065

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Backing Layer.

ultrasonic backing layer transducer damping material acoustic impedance matching pulse shortening medical imaging components NDT transducer parts Backing Layer Backing Layer in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Ultrasonic Transducer Array

A precisely arranged assembly of multiple ultrasonic transducers that generates and focuses ultrasonic waves for cleaning applications.

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Keypad/Interface

User input and control interface component for weight indicator/controller systems

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Engineering Analysis

Risks & Mitigation
  • Delamination from piezoelectric element
  • Thermal degradation at high power
  • Inconsistent impedance matching
  • Moisture absorption affecting properties
FMEA Triads
Trigger: Poor adhesive bonding or thermal expansion mismatch
Failure: Delamination between backing layer and piezoelectric element
Mitigation: Use compatible adhesives with proper surface preparation, design with graded impedance layers
Trigger: Excessive thermal loading during operation
Failure: Material degradation and property changes
Mitigation: Incorporate heat-dissipating fillers, design for adequate thermal management
Trigger: Inconsistent filler distribution during manufacturing
Failure: Non-uniform acoustic properties across transducer array
Mitigation: Implement rigorous mixing and curing process controls, use automated inspection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Acoustic impedance ±5%, thickness ±0.1 mm, attenuation coefficient ±10%
Test Method
Impedance testing per IEC 62127-1, pulse-echo measurement per ASTM E1065, thermal cycling per ISO 18563-1

Buyer Feedback

★★★★☆ 4.7 / 5.0 (33 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Backing Layer meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Backing Layer arrived with full certification."

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Frequently Asked Questions

What is the primary function of a backing layer in ultrasonic transducers?

The primary function is to absorb backward-propagating acoustic energy from the piezoelectric element, reducing ringing effects and shortening pulse duration for improved axial resolution.

How does backing layer material affect transducer performance?

Material properties like acoustic impedance and attenuation coefficient directly impact bandwidth, sensitivity, and signal-to-noise ratio. Proper impedance matching maximizes energy transfer into the backing layer.

Can backing layers be customized for different applications?

Yes, backing layers are often customized with specific impedance values, attenuation characteristics, and thermal properties for medical imaging, industrial testing, or high-temperature applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Back Ferrule (if dual ferrule design) Baffle Plate