DMWY Half-Bridge Strain Displacement Sensor

Product Introduction

The DMWY Half-Bridge Strain Displacement Sensor is a precision displacement measurement device that converts linear displacement or displacement-related mechanical changes into electrical signals. Based on a half-bridge strain measurement configuration, it is designed for accurate linear displacement testing under static, quasi-static, and low-frequency dynamic conditions.

Available in multiple measurement ranges from ±5 mm to ±300 mm, the DMWY series supports different experimental and engineering measurement requirements. It can be used with compatible static or dynamic strain measurement instruments to monitor displacement in water conservancy and hydropower projects, material mechanics experiments, bridge and tunnel engineering, aviation research, and civil engineering applications.

The sensor features low indication drift, high measurement accuracy, and a theoretical service life of up to 10 million cycles, depending on actual testing conditions. It can also be integrated with the manufacturer's wireless module to form a wireless displacement measurement system.

Performance Features

•  Half-bridge strain technology: Converts linear displacement into an electrical strain signal for measurement and analysis.

•  Multiple measurement ranges: Available in ranges from ±5 mm to ±300 mm for different displacement testing requirements.

•  High measurement accuracy: Specified accuracy of ≤0.2% F.S.

•  Low indication drift: Indication change is less than ±3 με over 8 hours.

•  Low basic error: Basic error is less than ±5 με.

•  Wide operating temperature range: Designed for operation from -35°C to +60°C.

•  Static and dynamic compatibility: Suitable for static, quasi-static, and low-frequency dynamic displacement testing.

• Flexible system integration: Compatible with static and dynamic strain gauges and acquisition instruments.

• Wireless expansion: Can be combined with the manufacturer's wireless module to form a wireless displacement sensor.

•  Long theoretical service life: Designed for up to 10 million operating cycles, subject to actual test conditions.

Working Principle

The DMWY half-bridge strain displacement sensor operates by converting mechanical displacement into an electrical signal through a strain-sensitive measurement structure.

When the measured object moves, the sensor's mechanical sensing element undergoes a corresponding deformation. This deformation produces a change in the resistance of the strain-sensitive elements arranged in a half-bridge circuit.

The resulting electrical signal is transmitted to a compatible strain measurement instrument, which processes the signal and converts it into a displacement value according to the sensor's calibration and sensitivity characteristics.

The half-bridge configuration enables displacement-related strain signals to be measured for static, quasi-static, and low-frequency dynamic testing. When paired with a compatible wireless module, the sensor can also be incorporated into a wireless displacement monitoring system.

Technical Parameters

Model Specifications

F.S. refers to full scale. Full-scale output is expressed in microstrain (με).

Application Scenarios

The DMWY half-bridge strain displacement sensor is suitable for displacement measurement in engineering experiments, scientific research, and industrial testing.

• Water Conservancy and Hydropower: Monitoring structural displacement and deformation in dams, hydraulic structures, and hydropower facilities.

• Bridge Engineering: Measuring displacement and deflection in bridge structures during load and structural performance tests.

• Tunnel Engineering: Monitoring deformation and displacement in tunnel structures and underground engineering experiments.

•  Material Mechanics Testing: Measuring linear displacement and deformation during material loading and mechanical experiments.

•  Civil Engineering Research: Monitoring displacement in structural models, construction components, and engineering test specimens.

• Aviation Research: Supporting displacement measurement in relevant structural and mechanical experiments.

• Laboratory Experiments: Providing displacement signals for static, quasi-static, and low-frequency dynamic research and teaching.

Product Comparison

The DMWY series provides multiple measurement ranges and configurations to accommodate different displacement testing requirements.

Selection Guide: Select the model according to the expected displacement range, installation space, and measurement system. Smaller-range models are suitable for precise measurements over short travel distances, while the DMWY-300, DMWY-400, and DMWY-600 support larger displacement measurements.

Frequently Asked Questions (FAQ)

1. What is the DMWY half-bridge strain displacement sensor used for?

It is used to measure linear displacement in engineering structures, materials, and experimental specimens. Typical applications include bridges, tunnels, hydropower facilities, civil engineering, and material mechanics testing.

2. What measurement ranges are available?

The DMWY series offers eight ranges: ±5, ±15, ±25, ±50, ±100, ±150, ±200, and ±300 mm.

3. Can the DMWY sensor measure dynamic displacement?

Yes. It supports static, quasi-static, and low-frequency dynamic displacement testing when used with a compatible strain measurement system.

4. What is the measurement accuracy?

The specified accuracy is ≤0.2% F.S. The basic error is less than ±5 με, and the indication change is less than ±3 με over 8 hours.

5. What is the operating temperature range?

The sensor is designed to operate from -35°C to +60°C.

6. Which wiring configuration does the sensor use?

It uses a half-bridge configuration with three wires: A (red), B (black), and C (blue). Follow the manufacturer's wiring instructions when connecting it to an acquisition instrument.

7. Can the DMWY sensor be used for wireless displacement monitoring?

Yes. When combined with the manufacturer's compatible wireless module, it can form a wireless displacement sensor.

8. What is the theoretical service life of the sensor?

The theoretical service life is approximately 10 million cycles. Actual service life depends on installation, operating conditions, and test requirements.

9. How should users select a suitable DMWY model?

Choose a model based on the maximum expected displacement, required measurement resolution, available installation space, and compatible acquisition equipment.