Working Principle
The Falling Weight Deflectometer (FWD) uses a hydraulic lifting mechanism to raise a known mass to a predetermined height and then release it to generate a controlled impulse load on the pavement surface.
The impact force is transferred through a loading plate to the pavement, producing a transient surface deflection. Geophones or displacement sensors positioned at different radial distances from the loading point measure the resulting pavement deflections. The data acquisition system records the sensor signals and calculates the deflection response and deflection basin under dynamic loading.
The test data can be used to back-calculate the structural layer moduli of the pavement, providing a basis for evaluating pavement structural capacity.
Equipment Parameters
Available models: FWD-10T, FWD-100T, FWD-150T, FWD-200T, FWD-300T
| Technical Specification | Falling Weight Deflectometer | Truck-mounted falling weight deflectometer | Trailer-mounted falling weight deflectometer (lightweight type) | Heavy-duty Falling Weight Deflectometer (Trailer Type) | Handheld Falling Weight Deflectometer |
| CFWD-10T | JGFWD-200 | JGFWD-5T | JGFWD-24T | PFWD-1500 | |
| Impact load range | 0-90KN (Expandable to 130KN) | 0-90KN (Expandable to 130KN) | 0-70KN (Expandable to 90KN) | 0-240KN (Expandable to 350KN) | 0-10KN (Expandable to 15KN) |
| Dynamic force measurement range | 0 ~ 150KN | 0 ~ 150KN | 0 ~ 150KN | 0 ~ 500KN | 0 ~ 25KN |
| Indication error of the load sensor | ≤±1% | ≤±1% | ≤±1% | ≤±1% | ≤±1% |
| Load indication error | ≤±2% | ≤±2% | ≤±2% | ≤±2% | ≤±2% |
| Load repeatability | ≤1% | ≤1% | ≤1% | ≤1% | ≤1% |
| Load pulse shape | Half-sine Wave | Half-sine Wave | Half-sine Wave | Half-sine Wave | Half-sine Wave |
| Displacement measurement range | 0-3.5mm | 0-3.5mm | 0-3.5mm | 0-3.5mm | 0-3.5mm |
| Number of displacement sensors | 1-9 pcs | 1-9 pcs | 1-9 pcs | 1-9 pcs | 1-3 pcs |
| Indication error of the deflection sensor | ≤±1% | ≤±1% | ≤±1% | ≤±1% | ≤±1% |
| Deflection indication error | Center point ≤2%; Off-center point ≤3% | Center point ≤2%; Off-center point ≤3% | Center point ≤2%; Off-center point ≤3% | Center point ≤2%; Off-center point ≤3% | ≤±2% |
| Deflection Resolution | 0.1μm | 0.1μm | 0.1μm | 0.1μm | 0.1μm |
| Deflection Repeatability | Center point ≤1%; Off-center point ≤1.5% | Center point ≤1%; Off-center point ≤1.5% | Center point ≤1%; Off-center point ≤1.5% | Center point ≤1%; Off-center point ≤1.5% | ≤1% |
| Temperature Sensor | 2 pcs, capable of measuring ambient and pavement temperature separately | 2 pcs, capable of measuring ambient and pavement temperature separately | 2 pcs, capable of measuring ambient and pavement temperature separately | 2 pcs, capable of measuring ambient and pavement temperature separately | / |
| Temperature Indication Error | ≤±1°C | ≤±2°C | ≤±2°C | ≤±2°C | ≤±2°C |
| Distance Indication Error | ≤0.5m | ≤0.5m | ≤0.5m | ≤0.5m | / |
| Single-point Test Speed | <20 s/point (3 measurements) | <20 s/point (3 measurements) | <20 s/point (3 measurements) | <40 s/point (3 measurements) | <30 s/point (3 measurements) |
| Lifting Hammer Mode | Hydraulic | Hydraulic | Hydraulic | Hydraulic | Manual Mechanical |
| Loading Plate Lifting Mode | Hydraulic | Hydraulic | Hydraulic | Hydraulic | Manual Mechanical |
| Data Transmission | USB Transmission | Wi-Fi/Wired Network Transmission | Wi-Fi/Wired Network Transmission | USB Transmission | Wi-Fi Network Transmission |
| Power Supply | 12V | 12V | 12V | 24V | Lithium Battery |
| Carrying Mode / Vehicle Features | Carrier Vehicle: Maxus inspection vehicle, Transit and other officially announced modified vehicles | Original German imported chassis, vehicle length only 3.8m, suitable for curve turning to improve driving safety. | Trailer chassis, sedan chassis, 4-wheel independent suspension, low vibration and stable operation. L*W*H: 3.0×1.4×1.65m (7 sensors) | Original German imported chassis, Overall Dimension: 4400×1850×1780mm | / |
| Others | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. ★Anti-rear-collision structure against vehicle impact; stable, non-deformable modular installation; reference platform optical axis positioning and guiding structure | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. | ★Equipped with handheld tablet or laptop for wireless transmission of measurement data; |
Advantages and Features
| Feature | Description |
| More Convenient | Equipped with a user-friendly "One-touch" operation mode for customers. A "One-touch" button is installed in the driver's cabin. After the vehicle reached the preset test position, an automatic reminder is triggered. The driver only needs to press the button once, and the equipment will run automatically. After the test is completed, the equipment will automatically enter the transport locking state. |
| More Rapid | The time for completing a single-point detection and acquisition (including three times of hammer lifting/dropping and data collection in accordance with specifications) is within 20 seconds. |
| More Precise | High measurement accuracy. Through scientific system planning and design, combined with high-performance sensors, a high-precision algorithm, and high-speed dedicated data acquisition system, and customized digital signal processing algorithms, the deflection data is ensured to be accurate and reliable. |
| More Safe | Equipped with interlock protection device. An interlock connector is installed between the deflectometer and the test vehicle. When the test vehicle is in motion, the equipment is in a protected state and the hammer is not allowed, effectively ensuring the safety of both the equipment and the test vehicle. |
| More Stable | Equipped with a dual synchronized lifting platform, which makes data acquisition more stable and improves data accuracy. |
| More Reliable | Each major function is equipped with a backup second solution (or function) to enhance the overall reliability of the equipment. |
Intellectual Property
Multiple patents and software copyrights held (certificates displayed on original product page).
Working Principle
The Falling Weight Deflectometer (FWD) uses a hydraulic lifting mechanism to raise a known mass to a predetermined height and then release it to generate a controlled impulse load on the pavement surface.
The impact force is transferred through a loading plate to the pavement, producing a transient surface deflection. Geophones or displacement sensors positioned at different radial distances from the loading point measure the resulting pavement deflections. The data acquisition system records the sensor signals and calculates the deflection response and deflection basin under dynamic loading.
The test data can be used to back-calculate the structural layer moduli of the pavement, providing a basis for evaluating pavement structural capacity.
Equipment Parameters
Available models: FWD-10T, FWD-100T, FWD-150T, FWD-200T, FWD-300T
| Technical Specification | Falling Weight Deflectometer | Truck-mounted falling weight deflectometer | Trailer-mounted falling weight deflectometer (lightweight type) | Heavy-duty Falling Weight Deflectometer (Trailer Type) | Handheld Falling Weight Deflectometer |
| CFWD-10T | JGFWD-200 | JGFWD-5T | JGFWD-24T | PFWD-1500 | |
| Impact load range | 0-90KN (Expandable to 130KN) | 0-90KN (Expandable to 130KN) | 0-70KN (Expandable to 90KN) | 0-240KN (Expandable to 350KN) | 0-10KN (Expandable to 15KN) |
| Dynamic force measurement range | 0 ~ 150KN | 0 ~ 150KN | 0 ~ 150KN | 0 ~ 500KN | 0 ~ 25KN |
| Indication error of the load sensor | ≤±1% | ≤±1% | ≤±1% | ≤±1% | ≤±1% |
| Load indication error | ≤±2% | ≤±2% | ≤±2% | ≤±2% | ≤±2% |
| Load repeatability | ≤1% | ≤1% | ≤1% | ≤1% | ≤1% |
| Load pulse shape | Half-sine Wave | Half-sine Wave | Half-sine Wave | Half-sine Wave | Half-sine Wave |
| Displacement measurement range | 0-3.5mm | 0-3.5mm | 0-3.5mm | 0-3.5mm | 0-3.5mm |
| Number of displacement sensors | 1-9 pcs | 1-9 pcs | 1-9 pcs | 1-9 pcs | 1-3 pcs |
| Indication error of the deflection sensor | ≤±1% | ≤±1% | ≤±1% | ≤±1% | ≤±1% |
| Deflection indication error | Center point ≤2%; Off-center point ≤3% | Center point ≤2%; Off-center point ≤3% | Center point ≤2%; Off-center point ≤3% | Center point ≤2%; Off-center point ≤3% | ≤±2% |
| Deflection Resolution | 0.1μm | 0.1μm | 0.1μm | 0.1μm | 0.1μm |
| Deflection Repeatability | Center point ≤1%; Off-center point ≤1.5% | Center point ≤1%; Off-center point ≤1.5% | Center point ≤1%; Off-center point ≤1.5% | Center point ≤1%; Off-center point ≤1.5% | ≤1% |
| Temperature Sensor | 2 pcs, capable of measuring ambient and pavement temperature separately | 2 pcs, capable of measuring ambient and pavement temperature separately | 2 pcs, capable of measuring ambient and pavement temperature separately | 2 pcs, capable of measuring ambient and pavement temperature separately | / |
| Temperature Indication Error | ≤±1°C | ≤±2°C | ≤±2°C | ≤±2°C | ≤±2°C |
| Distance Indication Error | ≤0.5m | ≤0.5m | ≤0.5m | ≤0.5m | / |
| Single-point Test Speed | <20 s/point (3 measurements) | <20 s/point (3 measurements) | <20 s/point (3 measurements) | <40 s/point (3 measurements) | <30 s/point (3 measurements) |
| Lifting Hammer Mode | Hydraulic | Hydraulic | Hydraulic | Hydraulic | Manual Mechanical |
| Loading Plate Lifting Mode | Hydraulic | Hydraulic | Hydraulic | Hydraulic | Manual Mechanical |
| Data Transmission | USB Transmission | Wi-Fi/Wired Network Transmission | Wi-Fi/Wired Network Transmission | USB Transmission | Wi-Fi Network Transmission |
| Power Supply | 12V | 12V | 12V | 24V | Lithium Battery |
| Carrying Mode / Vehicle Features | Carrier Vehicle: Maxus inspection vehicle, Transit and other officially announced modified vehicles | Original German imported chassis, vehicle length only 3.8m, suitable for curve turning to improve driving safety. | Trailer chassis, sedan chassis, 4-wheel independent suspension, low vibration and stable operation. L*W*H: 3.0×1.4×1.65m (7 sensors) | Original German imported chassis, Overall Dimension: 4400×1850×1780mm | / |
| Others | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. ★Anti-rear-collision structure against vehicle impact; stable, non-deformable modular installation; reference platform optical axis positioning and guiding structure | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. | ★Unique positioning function for test data: Each measuring point contains active GPS/Beidou longitude and latitude geographic information, providing scientific basis for repeated observation, comparison and analysis at the same measuring point in later stage. | ★Equipped with handheld tablet or laptop for wireless transmission of measurement data; |
Advantages and Features
| Feature | Description |
| More Convenient | Equipped with a user-friendly "One-touch" operation mode for customers. A "One-touch" button is installed in the driver's cabin. After the vehicle reached the preset test position, an automatic reminder is triggered. The driver only needs to press the button once, and the equipment will run automatically. After the test is completed, the equipment will automatically enter the transport locking state. |
| More Rapid | The time for completing a single-point detection and acquisition (including three times of hammer lifting/dropping and data collection in accordance with specifications) is within 20 seconds. |
| More Precise | High measurement accuracy. Through scientific system planning and design, combined with high-performance sensors, a high-precision algorithm, and high-speed dedicated data acquisition system, and customized digital signal processing algorithms, the deflection data is ensured to be accurate and reliable. |
| More Safe | Equipped with interlock protection device. An interlock connector is installed between the deflectometer and the test vehicle. When the test vehicle is in motion, the equipment is in a protected state and the hammer is not allowed, effectively ensuring the safety of both the equipment and the test vehicle. |
| More Stable | Equipped with a dual synchronized lifting platform, which makes data acquisition more stable and improves data accuracy. |
| More Reliable | Each major function is equipped with a backup second solution (or function) to enhance the overall reliability of the equipment. |
Intellectual Property
Multiple patents and software copyrights held (certificates displayed on original product page).
