非接触空中伝播超音波探触子 PHENOMENALLY HIGH EFFICIENCY NON-CONTACT ULTRASOUND TRANSDUCERS
Non-contact - gas/air coupled -- ultrasonic transducers offered by SecondWave represent the epitome of transducer design. These devices have been under development since 1978, reaching perfection in 1997 with US and several international patents. NCU transducers are based upon piezoelectric phenomena and feature perfect Z-matching for 100% transduction in air from <100 kHz to 10 MHz.
The new NCU transducers generate immense acoustic pressure in air between <100 kHz to 5 MHz. This is the key to Non-Contact Ultrasound and the magnitude of this development. Imagine 2.0 MHz transmission in 25 mm steel (6 orders of magnitude Z mismatch) with only one burst 16 Vpp and 64 dB amplification!
- Total freedom from touch or contamination
- Efficiency rivaling contact transducers
- High frequency -- <100 kHz to >10 MHz
- Robust construction
NCU TRANSDUCERS
SPECIFICATIONS
| FEATURE | SPECIFICATIONS |
|---|---|
| Frequency Range Sensitivity | <100 kHz to >10 MHz Phenomenally high in air, ~30 dB lower than contact transducers |
| Signal to Noise Ratio Bandwidth | Generally, >60 dB Nominally, between 30 to 50% of BCF - broader bandwidths, also available |
| Dimensional Range Geometrical Configuration Housing |
<1 mm to >76 mm active diameter Planar, point and cylindrically focused Aluminum protected by clear plastic cover |
| Co-axial Connector | Axially mounted standard BNC |
| Maximum Humidity | 90% RH |
| Maximum Temperature | 70 deg C |
| Maximum Gas Pressure | Successfully tested up to 50 bars |
| Construction | Robust and factory suitable |
PLANAR TRANSDUCERS
ORDERING INFORMATION
| CATALOG # | FREQUENCY | ACTIVE DIAMETER (mm) |
|---|---|---|
| NCT-101 NCT-201 |
100 kHz | 25.0 50.0 |
| NCT-52 NCT-102 NCT-202 |
200 kHz | 12.5 25.0 50.0 |
| NCT-25 NCT-55 NCT-105 NCT-205 |
500 kHz | 6.3 12.5 25.0 50.0 |
| NCT110 NCT-210 NCT-510 NCT1010 |
1.0 MHz | 3.2 6.3 12.5 25.0 |
| NCT120 NCT-220 NCT-520 |
2.0 MHz | 3.2 6.3 12.5 |
| NCT130 NCT-230 NCT-530 |
3.0 MHz | 3.2 6.3 12.5 |
| NCT140 NCT-240 NCT-540 |
4.0 MHz | 3.2 6.3 12.5 |
| NCT150 NCT-250 NCT-550 |
5.0 MHz | 3.2 6.3 12.5 |
For assistance and other variables, please contact us.
FOCUSED NON-CONTACT TRANSDUCERS
Non-contact transducers can also be configured to generate focusing mechanism in air. In the following table we have provided a few point focused transducers. Should you need cylindrically focused transducers, simply change the suffix “P” to “C.” The numeral following the suffix is the Relative Aperture (RA, focal length/active diameter). Very small RA transducers are difficult to produce, however, in special cases we have made transducers with RA of 1.
ORDERING INFORMATION
| MODEL # | FREQ. | ACTIVE Ф (mm) |
FOCAL LENGTH IN AIR (mm) |
FOCAL POINT IN AIR (~mm) |
HALF ANGULAR APERTURE (~o) |
|---|---|---|---|---|---|
| NCT-102-P4 NCT-102-P6 NCT-202-P4 NCT-202-P6 |
200 kHz | 25 50 |
100 150 200 300 |
7.0 10.0 7.0 10.0 |
7.2 4.8 7.2 4.8 |
| NCT-105-P4 NCT-105-P6 |
500 kHz | 25 | 100 150 |
2.8 4.2 |
7.2 4.8 |
| NCT-210-P4 NCT-510-P4 NCT-510-P6 |
1.0 MHz | 6.3 12.5 |
25 50 75 |
1.4 1.4 2.1 |
7.2 7.2 4.8 |
| NCT-220-P4 NCT-520-P4 NCT-520-P6 |
2.0 MHz | 6.3 12.5 |
25 50 75 |
0.7 0.7 1.0 |
7.2 7.2 4.8 |
| NCT-230-P4 NCT-530-P4 NCT-530-P6 |
3.0 MHz | 6.3 12.5 |
25 50 75 |
0.5 0.5 0.7 |
7.2 7.2 4.8 |
| NCT-240-P4 NCT-540-P4 NCT-540-P6 |
4.0 MHz | 6.3 12.5 |
25 50 75 |
0.35 0.35 0.55 |
7.2 7.2 4.8 |
| NCT-250-P4 NCT-250-P6 |
5.0 MHz | 6.3 | 25 38 |
0.28 0.42 |
7.2 4.8 |
For assistance and other variables, please contact us.
AIR/GAS VELOCITY COMPENSATION NON-CONTACT TRANSDUCERS
In order to increase the stability of ultrasound signals in NCU mode sometimes it may be necessary to compensate for velocity fluctuations in air caused by thermal currents, humidity variations, and turbulent air flow. This is especially true for very accurate thickness, velocity, transmittance, reflectance, and density measurements. While our NCA 1000 with planar transducers is capable of providing accuracies within +/- 1%, with Velocity Compensation (VC) transducers it can be increased by an order of magnitude. VC transducers feature constant distance built-in reflectors in front of active transducers from which the NCA 1000 constantly determines the air velocity to apply to all measurements.
ORDERING INFORMATION
| CATALOG # | FREQ. | ACTIVE |
TRANSDUCER- INTERNAL REFLECTOR AIR DISTANCE (mm/round-trip ToF, μs) |
BEAM EXIT APERTURE DIAMETER (mm) |
|---|---|---|---|---|
| NCT-102-VC | 200 kHz | 25.0 | 50/290 | 19 |
| NCT-55-VC NCT-75-VC NCT-105-VC |
500 kHz | 12.5 19.0 25.0 |
20/115 20/115 20/115 |
10 14 19 |
| NCT-510-VC NCT-710-VC |
1.0 MHz | 12.5 19.0 |
10/58 10/58 |
10 14 |
| NCT-520-VC | 2.0 MHz | 12.5 | 5/29 | 10 |
For assistance and other variables, please contact us.
