Backing Layer: Operating Temperature -20°C to 80°C

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 18563-1, IEC 62127-1, ASTM E1065

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.

View Product Details

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Backing Layer

Manufacturer profiles associated with Backing Layer.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Backing Layer