Two angled elements create a V-shaped sound path in the test material. This "Pseudo-Focus" enhances resolution in the focal zone.
A dual element transducer consists of two crystal elements housed in the same case, separated by an acoustic barrier. One element transmits lon gitudinal waves, and the other element acts as a receiver.
Advantages:
- Improves near surface resolution
- Eliminates delay line multiples for high temperature applications
- Couples well on rough or curved surfaces
- Reduces direct back-scattering noise in coarse grained or scattering materials
- Combines penetration capabilities of a lower frequency single element transducer with the near surface resolution capabilities of a higher frequency single element transducer
- Can be contoured to conform to curved parts
Applications:
- Remaining wall thickness measurement
- Corrosion/erosion monitoring
- Weld overlay and cladding bond/disbond inspection
- Detection of porosity, inclusions, cracks, and laminations in castings and forgings
- Crack detection in bolts or other cylindrical objects
- Maximum temperature capability is 800°F (425°C) for 5.0 MHz and below; 350°F (175°C) for 7.5 MHz and 10 MHz. Recommended duty cycle for surface temperatures from 200°F (90°C) to 800°F (425°C) is ten seconds maximum contact followed by a
minimum of one minute air cooling (does not apply to Miniature Tip Dual)
Flush Case Duals
- Metal wear ring extends transducer life
- Wear indicator references when transducer face needs resurfacing
- Knurled, 303 stainless steel case
- Replaceable cable design (special dual cables with strain relief available)
Freq.
|
Nominal
Element Size
|
Transducer
Part Numbers
|
MHz
|
inches
|
mm
| |
1.0
|
0.50
|
13
|
DHC703-RM
|
2.25
|
0.50
|
13
|
DHC706-RM
|
0.25
|
6
|
DHC785-RM
|
5.0
|
0.50
|
13
|
DHC709-RM
|
0.25
|
6
|
DHC711-RM
|
10
|
0.25
|
6
|
DHC713-RM
|
Flush Case Dual Cables
Cable Part
Number
|
Fits Connector Style
|
BCMD-316-5F
|
Dual BNC to Microdot®
|
L1CMD-316-5F
|
Dual Large Lemo 1 to Microdot
|
LCMD-316-5F
|
Dual Small Lemo 00 to Microdot
|
Composite Element Flush Case Duals
Freq.
|
Nominal
Element Size
|
Transducer Part Number
|
MHz
|
inches
|
mm
| |
2.25
|
0.50
|
13
|
CHC706-RM
|
Fingertip Duals
- Knurled case, except the 0.25" (6 mm) element size
- High-strength flexible 6' (1.8 m) potted cable (fits BNC or Large Lemo® 1 connectors)
Freq.
|
Nominal
Element Size
|
Transducer
Part Numbers
|
MHz
|
inches
|
mm
|
Fits BNC Connector
|
Fits Large Lemo Connector
|
1.0
|
0.75
|
19
|
D714-RP
|
D714-RPL1
|
0.50
|
13
|
D703-RP
|
D703-RPL1
|
2.25
|
0.75
|
19
|
D705-RP
|
D705-RPL1
|
0.50
|
13
|
D706-RP
|
D706-RPL1
|
0.375
|
10
|
D771-RP
|
D771-RPL1
|
0.25
|
6
|
D785-RP
|
D785-RPL1
|
3.5
|
0.75
|
19
|
D781-RP
|
D781-RPL1
|
0.50
|
13
|
D782-RP
|
D782-RPL1
|
0.375
|
10
|
D783-RP
|
D783-RPL1
|
0.25
|
6
|
D784-RP
|
D784-RPL1
|
5.0
|
0.75
|
19
|
D708-RP
|
D708-RPL1
|
0.50
|
13
|
D709-RP
|
D709-RPL1
|
0.375
|
10
|
D710-RP
|
D710-RPL1
|
0.25
|
6
|
D711-RP
|
D711-RPL1
|
7.5
|
0.50
|
13
|
D720-RP
|
D720-RPL1
|
0.25
|
6
|
D721-RP
|
D721-RPL1
|
10
|
0.50
|
13
|
D712-RP
|
D712-RPL1
|
0.25
|
6
|
D713-RP
|
D713-RPL1
|
Miniature Tip Dual
- Provides better coupling on curved surfaces
- Low profile allows for better access in areas of limited space
- Maximum temperature capability 122°F (50°C)
Freq.
|
Tip
Diameter
|
Nominal
Element Size
|
Transducer
Part Number
|
MHz
|
inches
|
mm
|
inches
|
mm
| |
5.0
|
0.20
|
5
|
0.15
|
3.8
|
MTD705
|
Miniature Tip Dual Cables
- Replaceable cable for all flaw detectors
Cable Part Number
|
Fits Connector Style
|
BCLPD-78-5
|
Dual BNC to Lepra/Con
|
L1CLPD-78-5
|
Dual Large Lemo 1 to Lepra/Con
|
LCLPD-78-5
|
Dual Small Lemo 00 to Lepra/Con
|
Extended Range Duals
- Shallow roof angles provide greater sensitivity to deep flaws, back walls, and other reflectors, 0.75" (19 mm) and beyond in steel
- Can be used for high temperature measurements when delay lines are unacceptable
- High-strength flexible 6' (1.8 m) potted cable with BNC connectors
Freq.
|
Nominal
Element Size
|
Roof Angle
|
Transducer
Part Numbers
|
MHz
|
inches
|
mm
|
(°)
| |
2.25
|
1.00
|
25
|
0
|
D7079
|
0.50
|
13
|
0
|
D7071
|
0.50
|
13
|
1.5
|
D7072
|
0.50
|
13
|
2.6
|
D7074
|
0.50
|
13
|
3.5
|
D7073
|
5.0
|
1.00
|
25
|
0
|
D7080
|
0.50
|
13
|
0
|
D7075
|
0.50
|
13
|
1.5
|
D7076
|
0.50
|
13
|
2.6
|
D7078
|
0.50
|
13
|
3.5
|
D7077
|
Fingertip andExtended Range Dual
Transducer Dimensions
(in inches)
|
Nominal Element Size
|
(A)
|
(B)
|
(C)
|
1.00*
|
1.25
|
0.75
|
1.00
|
0.75
|
1.00
|
0.75
|
0.75
|
0.50
|
0.70
|
0.75
|
0.50
|
0.50*
|
0.70
|
0.63
|
0.61
|
0.375
|
0.53
|
0.62
|
0.375
|
0.25
|
0.35
|
0.54
|
0.25
|
