The Falling Weight Deflectometer is a specialized equipment for pavement testing, there are single point and multi point two types of with Vehicular and Trailer model.

Working Principle

The hydraulic system lift the rammer to specific height, then drop, the rammer do free falling movement, impact the bearing platen on the pavement, thus make the pavement produce some deformation, then the DAQ set will acquire the deformation and the impact force, also will acquire the air temperature, pavement temperature, asphalt temperature, GPS data.

Technical Specifications 

1. Trailor 

Brake deviceInertia braking

Traction deviceStandard trailer connector

Single deviceSteering, braking, reversing, showing width Combination lamp

Safety coatingSafety warning reflective logo

Alarm lightYellow warning light for engineering

Moving speed0-120km/h

2. Deflectometer 

No.TermSpec.

1 Falling weight system weight450kg

2 Hammer lifting wayHydraulic

3 Power supply wayTractor 

4 Single point test time≤25s

5 Deflection   transducer typeMagnetoelectric velocity transducer(sensor brand)

6 Deflection range-2500μm~+2500μm

7 Deflection transducer quantity1~15 optional, 9pcs in standard configuration

8 Deflection test accuracy>2%

9 Deflection resolution 0.1um

10 Load cell typeStrain load cell

11 Max load150kn(can extended to 250kn)

12 Load range12~150kn

13 Loading impulse shapeHalf sine wave 

14 Loading test accuracy>2%

15 Loading resolution 0.1kn, 1kpa

16 Temperature   transducerPt Rtd/infrared

17 Temperature measurement-50-100 degree C, accuracy ±0.5%, resolution 0.1 degree C

18 DMI Test accuracy0.1%, resolution 0.1m

19 Loading platen type300mm diameter, 4-part sector disk

20 GPS Positioning   accuracy±1m

21 Front-end displayStation number, voice prompt for driver reference 

22 Self-balancing systemGuarantee balance of hammer system in up and down

23 Portable computerThinkpad Notebook computer

24 Analysis PC softwareEnglish version, compatible with Win 7 or Win 8 system.