The Walk-Behind Surface Profiler is a portable pavement measurement device designed for accurate longitudinal profile testing and International Roughness Index (IRI) evaluation. It collects pavement surface elevation data with high precision and generates profile analysis results for road smoothness assessment. The system is widely used for highway, airport runway, bridge deck, and pavement quality inspection applications.

Walk-Behind Surface Profiler | IRI Measurement

Model:TD935-1

I. Product Introduction

The Walk-Behind Surface Profiler is developed and manufactured by Hebei Tianqixingzi Inspection Equipment Co., Ltd. in accordance with JTG 3450-2019 Field Test Methods of Highway Subgrade and Pavement (T 0935-2019 Test Method for Pavement Smoothness Using a Hand-Pushed Profiler), with reference to ASTM E2133 and ASTM E1926.

It is designed for longitudinal profile measurement of pavement surfaces. The measuring platform is separated from the equipment enclosure, which helps reduce the influence of operator input on measurement accuracy.

II. Product Features

1. Hardware Features:

1.1 Multiple measurements on the same surface can achieve a data repeatability of up to 98%.

1.2 A true 25 mm sampling interval, equivalent to a Class 1 profiler according to ASTM E950.

1.3 Modular and portable design. All core electronic components and sensors are smaller than a laptop computer.

1.4 Equipped with a Panasonic rugged military-grade laptop, featuring a sunlight-readable display and touchscreen operation.

1.5 Professionally designed self-balancing vehicle frame. By removing the handle, the complete system can be placed into a reusable transportation case for convenient storage and transport.

1.6 Utilizes SSI’s patented electronic data acquisition system and filtering methods to process inputs from multiple sensors.

1.7 Equipped with a high-capacity battery, allowing continuous measurement for up to 8 hours.

1.8 Optional GPS subsystem and laser scanner for pavement texture measurement are available.

2. Software Features:

2.1 Directly displays multiple profile curves on the screen.

2.2 Generates commonly used pavement profile indices instantly.

2.3 Powerful Windows-based calibration, data acquisition, and analysis software.

2.4 Outputs test reports in PDF or Excel format.

III. Technical Specifications

1. Equipment Classification

ASTM E950 Class 1 and World Bank Class 1 profiler.

2. Test Results and Data Output

• Provides measurement results including IRI, HRI, PRI, RQI, RN, CA Bridge, and various localized smoothness templates.

• Supports data output in PDF, Excel, ERD/PPF, and raw trace formats.

• Suitable for floor flatness and levelness measurement.

3. Localized Smoothness

Measures surface irregularities and calculates peak-to-valley values. Different templates for straightedge, profiler, and inertial profiler measurements are available for evaluating pavement defects.

4. Measurement Units

Imperial / Metric units (selectable and user-configurable).

5. Testing Speed

0–5 km/h (For rough and uneven pavement surfaces, a lower testing speed is recommended to achieve the best results).

6. Sampling Interval

Default value: 25 mm. The sampling interval is adjustable.

7. Profile Accuracy: ±0.381 mm / 45.7 m

8. Elevation Measurement Accuracy: ±0.0025 mm / 254 mm (wheelbase)

9. Maximum Longitudinal Grade: 12°

10. Vertical (Distance) Resolution: ±0.025%

11. Power Supply

• Main system battery: High-capacity 12 V battery. The laptop computer is powered by its internal battery or connected to the main system battery.

• Battery operating time: More than 8 hours.

12. Weight

18 kg (excluding computer, battery, accessories, and transportation case).

13. Dimensions

34.5" (L) × 18.0" (W) × 12.125" (H) (Foldable design; height including handle: 36.5")

14. Environmental Conditions

• Operating temperature: -10 to 60°C

• Storage temperature: -30 to 75°C

15. Data Acquisition Electronics

Electronic system based on SSI patented embedded processor technology (ISO 9001 certified).

16. Operating Computer

Panasonic Toughbook 19 rugged military-grade laptop with touchscreen control.

17. Operating System

MS Windows XP/Vista operating system, equipped with powerful Windows-based calibration, data acquisition, and analysis software.

18. Data Storage

The laptop hard drive (80–160 GB) can store up to 320,000 km of profile data. Raw data files can be transferred via portable storage devices or email.

19. Data Formats

SSI proprietary encrypted format. Data can be exported in ERD, PRO, PPF, PDF, or Excel formats.

20. Optional Accessories

GPS, mapping subsystem (RTK GPS), and texture laser scanner.