MW640-15 Camera

Overview

MW640-15 Camera (3.7-4.8µm)

The MW640-15 is Optotherm’s most sensitive thermal imaging camera, providing spatial resolution down to 2μm and captures images at 100Hz. Due to the camera’s high image capture rate, lock-in tests can be performed with test frequencies up to 25Hz, reducing thermal diffusion and improving fault location. Because silicon is partially transparent in the MWIR range, features and metallization can be observed when testing devices from the backside. The MW640-15 camera also provides the ability to see through window materials commonly used in chip testing, such as silicon carbide.

Primary advantages of MWIR over LWIR for Lock-in Testing:

1. Higher spatial resolution of 2µm/pixel versus 5µm/pixel for LWIR due to short working wavelength and diffraction limit of lens design.

2. Higher transmission of Silicon (~50%) between 3-5µm allows viewing semiconductor features through Silicon.

3. Higher detector sensitivity reduces lock-in test time and allows detection of lower-power faults.

4. Higher camera frame rate improves lock-in test sensitivity and allows lock-in testing at higher cycle frequencies to isolate faults on thin devices.

Stirling Cooler Technology

The MWIR camera is cooled by a mechanical Stirling cooler which cools the detector to -190°C. Stirling coolers have a limited life span with an MTTF (mean time to failure) of ~10,000 hours. This is a long time, however if left on continuously for 1 year this would be 8,760 hours. Therefore, to prolong life the camera should be unpowered after each use. If it will be used intermittently throughout the day, however, it should be left on because On/Off cycling can shorted lifetime also. We did not send you a switch cord (see below) for easy on/off but will send 2 with next shipment. When the camera is first powered, the cooler is louder until the cooling temp is reached after ~5 minutes and then the cooler goes into low cooling mode to keep the detector cool.

Sensitive to infrared radiation from approximately 3.7 to 4.8 µm in wavelength. Each array element is approximately 15 x 15µm in dimension.

Optotherm chose MCT over InSb primarily for lower cooling requirements resulting in reduced dewar cooler weight, power requirements, and therefore reduced support issues.

Applications

• Semiconductor device failure analysis
• Circuit board failure analysis
• Backside analysis through partially transparent silicon
• Microscopic temperature measurement and analysis of features down to 2µm in size

Features

Comprehensive Calibration

Each camera undergoes a rigorous calibration procedure over the span of several days to precisely correlate detector response to temperature measurement. 

Compatible Lenses

Specifications

Detector

* Noise Equivalent Temperature Difference (NETD) specifies the smallest temperature difference that can be detected. The value stated is NETD at 100 Hz frame rate.

Camera Design

Camera Control and Image Output

† Optotherm thermal imaging cameras with frame rate of 9Hz or lower may be exported to many countries without an export license under ECCN 6A993.a NLR (no license required).

‡ Camera models using Camera Link are only compatible with Windows 10 Operating System. Camera models using USB are compatible with both Windows 10 and Windows 11 Operating System.  

Power

Physical

Setup, Operation, & Maintenance

Additional product resources are linked under Documents at the bottom of this webpage.

Troubleshooting

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