The Growing Importance of Displacement Measurement
Measurement and inspection accuracy and reproducibility are becoming more and more important in manufacturing, as they are directly linked to higher productivity, better quality, and cost reduction.
The role of Laser displacement sensors
In particular, displacement sensors using lasers with excellent light focusing and pointing characteristics are necessary in processes such as thickness and shape measurement, which require non-contact, high-precision measurement at the µm (micrometer) level.
Since laser displacement sensors are suitable for measuring microscopic dimensions such as wafer thickness and electrode thickness, as well as substrate height, gap, and cross-sectional shape, they are used in a wide range of applications such as measurement and inspection of brake disc displacement, engine vibration in automotive applications, and so on.
How laser displacement sensors work
A laser displacement sensor is an important device for measuring the displacement of a target object with high accuracy. In order to achieve high spatial resolution, the laser beam spot size must be small. For this reason, single transverse mode lasers are generally used.
The laser beam reflected by the measurement target is focused through the lens onto the CMOS sensor, and the displacement is calculated based on the position of the beam on the CMOS sensor.
The better the beam quality, the smaller the detection error and the more accurate and reproducible the measurement.
Selecting the right laser wavelength
In selecting a laser wavelength, many factors should be considered.
Currently, the near-infrared range (700-1000 nm) has the highest efficiency in laser diode emission, while most CMOS sensors most commonly used in photodetectors have the highest sensitivity in the 500-700 nm range. For this reason, laser diodes in the red band (630-700 nm) are widely used in view of total system efficiency
The Need for Miniaturization in Manufacturing
In the manufacturing process, it is also important to miniaturize the laser displacement sensor, since measurements must be made in a limited space.
To simplify the cooling structure of the device and achieve miniaturization, laser diodes that work stably at high temperatures are chosen.
Managing Heat and Power Efficiency
Depending on the detection distance of the laser displacement meter, there may be cases in which the measurement is performed in close proximity to the object, causing expansion of the object due to the heat generation from the device, which may cause a measurement error. Therefore, a laser diode that operates with low power consumption and high efficiency is required.
Consequently, laser diodes that operate at low power consumption and high efficiency are required.
The newly released “HL65311MG/312MG,” diode is ideal for laser displacement sensors. With a wavelength of 662 nm, optical output of 12 mW, and the highest operating temperature of 90℃. This diode is based on Ushio technologies developed over many years to achieve excellent beam quality, high efficiency, low power consumption, and high temperature operation.
Product Features
- Optical out power12mW
Allows for a wider measurement range, including low reflection and rough-surfaced objects. - Best-in-class wide operating temperature range of -40°C to 90°C
Applicable to a wide range of temperature environments, from cryogenic to high temperatures, the system simplifies the cooling structure of the device and realizes miniaturization. - Best-in-class low power consumption and high efficiency operation
It helps to suppress heat generation of the equipment and reduce measurement errors caused by expansion and contraction of the object due to temperature changes. - Excellent beam quality
It reduces detection errors and contributes for improvement of measurement accuracy.
Product specification（Tc＝25℃）
| Optical output power | 12mW |
| Lasing wavelength | 662nm |
| Operating temperature | -40～+90ºC |
| Beam Divergence (FWHM) | Parallel 7° Perpendicular 30° |
| Transverse mode | Single transverse mode |
| Oscillation mode | TE mode |
| Package | 5.6mm CAN Package |
Applications
Displacement Sensors
Photoelectric Sensors
Measuring instruments
Packages
Φ5.6mm Package
Internal circuit
| Products | HL65311MG | HL65312MG |
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Typical Characteristic curve
Datasheet
HL65311MG/312MG
MOQ for Mass Production
MOQ: 10,000 pcs/lot
Contact
If you are interested in receiving more information about Ushio’s laser diodes, please contact us.
