T-Ray 5000 Lens Options – HDPE Aspheric Terahertz Lenses and Adjustable Lens Tubes
HDPE aspheric lenses and adjustable lens tubes for T-Ray 5000 fiber-coupled terahertz transmitter and receiver sensor heads.
- Lens material
- High-density polyethylene (HDPE)
- Lens profile
- Aspheric
- Index of refraction
- approximately 1.8
- Absorption
- Small absorption region around 2.2 THz
Overview
The T-Ray® 5000 is a compact pulsed terahertz measurement system in a rack mount package with replaceable fiber-coupled sensor heads, allowing the system to be configured for a specific application. The basic system includes a T-Ray® 5000 Terahertz Controller, umbilical(s), and either a THz transceiver or a THz transmitter and THz receiver. The transmitter and receiver come standard with a 38 mm diameter lens in an adjustable lens tube.
The lens options are manufactured from high-density polyethylene (HDPE) to an aspheric profile for focusing across a wide range of frequencies. TeraMetrix designed these lenses for use with its fiber-coupled transmitter and receiver sensor heads. Mounted on the front of a transmitter, a lens provides either a collimated or a focused beam. The listed focal length is the distance from the lens surface to the beam waist.
Relay lenses are used in conjunction with a collimating lens on the sensor head. Lens tubes that mount on the transmitter or receiver are available for 1.5" and 3" lenses. The collinear adapter (AXA5001) and the integrated collinear transceiver (HXC50xn) are compatible with 1.5" diameter lenses.
The HDPE lenses have an index of refraction of approximately 1.8, which results in lower Fresnel loss than silicon lenses (index of approximately 3). The lenses are designed to operate with the aspheric side toward the module and the flat side toward the object, which maximizes the available working distance. HDPE has a small absorption region around 2.2 THz, which according to the manufacturer does not affect data collection.
Key Features
- Low loss
- Simple alignment
- No tool required for installation
- Compatible with transmitter or receiver
- Compatible with collinear adapter
Specifications
| Lens material | High-density polyethylene (HDPE) |
|---|---|
| Lens profile | Aspheric |
| Index of refraction |
approximately 1.8
Lower Fresnel loss compared to silicon (Si) lenses (index of approximately 3)
|
| Absorption |
Small absorption region around 2.2 THz
Manufacturer states this does not affect the collection of data
|
| Orientation |
Aspheric side toward the module, flat side toward the object
Maximizes the available working distance
|
| Focal length definition | Distance from the lens surface to the beam waist |
| Standard lens on transmitter and receiver | 38mm diameter lens in an adjustable lens tube |
|---|---|
|
Lens tube availability
LTA4201, LTA4401
|
1.5”, and 3” lenses
Lens tubes mount on the transmitter or receiver
|
|
Collinear adapter / integrated collinear transceiver
AXA5001, HXC50xn
|
Compatible with 1.5” diameter lenses |
Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.
Applications
- Thickness monitoring
- Density measurement
- Non-destructive test (NDT) with terahertz
- Time domain reflection tomography
- Nondestructive materials inspection
- Package inspection
- Semiconductor wafer inspection
- Medical and biological imaging and research
Options & Accessories
| Option | Description |
|---|---|
| LAH4202 | Lens, HDPE asphere, 1.5” dia., 1” focal length |
| LAH4204 | Lens, HDPE asphere, 1.5” dia., 3” focal length |
| LAH4205 | Lens, HDPE asphere, 1.5” dia., 6” focal length |
| LAH4200 | Lens, HDPE asphere, 1.5” dia., collimating |
| LAH4404 | Lens, HDPE asphere, 3” dia., 3” focal length |
| LAH4405 | Lens, HDPE asphere, 3” dia., 6” focal length |
| LAH4406 | Lens, HDPE asphere, 3” dia., 12” focal length |
| LAH4506 | Lens, HDPE asphere, 6” dia., 12” focal length |
| LTA4201 | Lens Tube, 1.5” dia., adjustable |
| LTA4401 | Lens Tube, 3” dia., adjustable |
Documents & Resources
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