What are the technical parameters of the national standard for ultrasonic thickness gauges?

Ultrasonic thickness gauge, come to Beijing Kehai Hengsheng Technology ****, reasonable charges, rich experience. Founded in 1999, Beijing Kehai Hengsheng Technology Co., Ltd. is a professional non-destructive testing equipment production and sales company, with the expansion of the company's scale, our company has established a good long-term cooperative relationship with more than a dozen world-renowned non-destructive testing equipment manufacturers, and has successively introduced ultrasonic imaging, digital ray imaging, acoustic emission, magnetic flux leakage, guided wave, elevator detection, magnetic memory and other high-tech products, so that our products cover almost all areas of non-destructive testing. The self-developed products are: multi-channel digital acoustic emission detector and accessories, digital ultrasonic flaw detector, portable Leeb hardness tester, boiler and pressure vessel inspection toolbox, mechanical and electrical equipment inspection toolbox.

National standard: GB11344 1989 Contact ultrasonic pulse-echo thickness measurement.

Verification Procedure: JJF1126 2004 Calibration Specification for Ultrasonic Thickness Gauge.

The value of the sound velocity of a commonly used material.

Material in us m s

Aluminum 6305

Bismuth 2184

Brass 4394

Calcium 2769

Cast Iron 4572

Constantan 5232

Copper 4674

Epoxy 2540

Cupronickel 4750

Glass 5664

Flint Glass 4267

Kim 3251

Ice 3988

Iron 5893

Lead 2159

Magnesium 5791

Mercury 1448

Nickel 5639

Nylon 2591

Paraffin 2210

Platinum 3962

Plexiglass 2692

Polystyrene 2337

Ceramic 5842

pvc 2388

Quartz glass 5639

Vulcanized rubber 2311

Silver 3607

Ordinary steel 5918

Stainless steel 5664

Stellite Carbide 6985

PTFE 1422

Tin 3327

Titanium 6096

Tungsten 5334

Zinc 4216

Water 1473

The Yongle Bell of the Great Bell Temple in Beijing can be called the king of the bells, but the records of its weight in the history books are different, some say 42 tons of Pai Kaiyun, some say 43 tons, and some say 53 tons. And the big bell hangs in the big bell hall and is not allowed to be put down and weighed; In addition, the big bell has thick lips and a thin waist, and it is not easy to measure it with a ruler; Moreover, the composition of the bell is not single. Therefore, the weight of the dust beam and the Yongle bell has always been a difficult mystery to solve.

In 1980, the Institute of Acoustics of the Chinese Academy of Sciences, with the assistance of the Great Bell Temple Cultural Relics Depository, used the precision ultrasonic thickness gauge they developed to finally solve this mystery by cross-triggering pulse overlapping method.

Because ultrasonic waves have a strong penetrating ability and can penetrate metals several meters thick, ultrasonic thickness gauges can be made by using the strong penetration ability of ultrasonic waves and then using the reflection of waves. When measuring the thickness of the bell, the thickness of the clock wall can be calculated by measuring the time when the ultrasonic pulse goes back and forth once, and then measuring the propagation speed of the ultrasonic wave in the clock according to the composition of the bell.

The results show that the thickness of the bell lip is centimeters, and the thickness of the thinnest part of the bell waist is centimeters. The wall of the bell is measured according to different points on the bell'thickness, drawn into the first ever Yongle bell section, and from this to calculate the volume of the bell.

After chemical testing, it can be found that the bell is made of copper, tin and so on.

It was made of gold and made of a sample that was basically the same as that of the Yongle Bell, and its density was measured. Finally, it was calculated that the exact weight of the Yongle bell should be tons, thus solving the mystery of the weight of the Yongle bell.

Since ultrasonic thickness measurement does not cause any damage to precious artifacts, it is a valuable means of studying historical artifacts. The success of the thickness measurement of the Yongle bell marks that the research of ultrasonic technology in China has reached a new level, and lays the foundation for future applications in other fields.

Beijing Shenghua Xingye Technology Co., Ltd. specializes in the production of ultrasonic thickness gauges, SW ultrasonic thickness gauges, technical parameters:

Automatic zero calibration of accuracy, no need for manual zero calibration before measurement.

The probe is automatically recognized, allowing the probe to be replaced at will, and the two plugs of the probe are inserted regardless of the front and back.

Standard, Scan, Alarm, Difference, High Temperature, Average, Surface and other measurement modes are available.

Built-in 9 commonly used materials for sound velocity can be selected directly, or you can manually input the known sound velocity.

The sound velocity of the material at the position can be determined by measuring a test block of known thickness for a single point or a two-point calibration.

The dedicated surface measurement mode is suitable for pipe wall thickness measurement, providing surface thickness measurement accuracy.

It is suitable for thickness measurement of metal, glass, plastic, rubber and other materials.

Probes with a variety of frequencies, diameters, and operating temperatures can be selected to meet a variety of special thickness measurement applications (such as: thin plates, tubes, extra-thick materials, high-temperature materials, etc.).

Large-capacity data storage for 2000 sets of measurement data.

The display units can be selected between millimeters and inches.

The measurement display interface displays real-time information such as sound velocity, probe resonance efficiency, coupling status, remaining battery power, and measurement mode.

Backlit function for use in unlit environments.

Low voltage or long idle time automatic shutdown.

The screen displays the rotation function, which is convenient for the upside-down instrument detection.

Measurement range (standard mode).

Surface measurement range: 15mm (probe: 6mm).

10mm (probe: , 6mm).

Display accuracy. Material sound velocity: 509m s--- 18699m s

Measurement accuracy: (1 h.)

Receiving wideband: 1MHz--10MHz (-3dB).

Measurement frequency: 2-20 times per second (settable).

Power supply: 3VDC (two AA alkaline batteries).

Operating hours: 280 hours (auto mode) 100 hours (backlight on mode).

Display: 128 64 dot matrix LEDs

Dimensions: 136(L) 72(W) 20(H).

Weight: 176g (including battery).

Operating temperature: -10-50

Operating humidity 20 --90 rh

Company**:

The main technical parameters of the ultrasonic thickness gauge.

Measuring range: steel).

Display accuracy: and optional.

Measurement error: 1 mm 10 mm : 10 mm 200 mm :( measurement cycle: 2 times.

Measurement frequency: 5MHz 2MHz

Sound velocity range: 1000-9999m s

Display: 128*64 LCD display, with cold light source illumination display zero adjustment: the probe is placed on the thickness gauge test block and the key is automatically zeroed alarm function: the limit can be set, and the measured value outside the limit can automatically buzz to alarm the working voltage:

Automatic shutdown: automatic shutdown without action for 2 consecutive minutes, there is a switch button to display the contents: thickness value, coupling state, power status, can display calibration status, sound velocity dimensions: 132 x mm

1. The maximum error is within the allowable value range, and the ultrasonic thickness gauge is qualified and a calibration record sheet is issued, otherwise it should be repaired, debugged and re-calibrated. 2 The calibration period of ultrasonic thickness gauge is one year.

Third-party testing institutions with ultrasonic thickness gauge testing qualifications such as metrology institutes can go to calibration;

A probe is 800 yuan for China Institute of Metrology, 600 yuan for a probe in Beijing Institute of Metrology, and 200 yuan for a probe in Wenzhou Institute of Metrology.

The level is not the same, the ** is different, the detection accuracy is not very high, and it can be sent for inspection in the local metrology institute.

This is the report page of the PD-T1 Ultrasonic Thickness Gauge from the China Institute of Metrology.

JJG 889-1995 Magnetoresistive Thickness Gauge, JJG 818-1993 Eddy Current Thickness Gauge.

HG T 3240-1987 Technical Specifications for Enamel Thickness GaugeHG T 3240-2007 Computerized Thickness Gauge HG T 3241-1989 Technical Specifications for Inner Bore Coating Thickness GaugeHG T 3241-2007 Computerized Inner Bore Thickness Gauge JJF 1126-2004 Calibration Specification for Ultrasonic Thickness GaugeJJG (Light Industry) 87-1992 V.R. for Portable Carpet Thickness GaugesJJG 403-1986 Ultrasonic Thickness Gauges.

JJG 480-1987 V. R. of X-ray Thickness Gauge JJG 818-1993 Eddy Current Thickness Gauge (Trial) JJG 889-1995 Magnetoresistive Thickness Gauge.

NJ 372-1985 Thickness Gauge for Rims.

ZB N 13003-1987 Technical Specifications for Enamel Thickness Gauges ZB N 77001-1989 General Technical Conditions for Ultrasonic Thickness Gauges.

Dongru coating thickness gauge is according to the national industry GB T 4956-1985 standard.