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Geegah imager PC Interface System

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Geegah Imaging boards

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Optical microscope addon

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Microfluidic Cavity 1 (Sealed)

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Microfluidic Cavity 2 (Pillars)

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Heater/Cooler for 37C operation

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Frequently Asked Questions

  • What’s the difference between light and ultrasonic imaging?

    Light microscopy requires a light source, laser, lamp, LEDs, to illuminate a surface. The reflected or transmitted image is captured by an optical imaging chip, or your eyes. In ultrasonic imaging, ultrasonic wave pulses are generated by piezoelectric transducers from MHZ to GHz frequencies. The wave packets travel through a substrate, and reflect off the imaging surface, and are measured electronically by the receive transducer. The transmitter and receiver are integrated in one chip in Geegah imagers.

  • What is ultrasound?

    Ultrasound means sound waves that are operating at high frequencies, outside the audible frequency range. Typically, anything above 20kHz is considered ultrasound. However, for Geegah, our devices operate at the very high imaging frequencies of several Gigahertz (billion cycles per second)

  • How does the imager work?

    For Geegah imager, gigahertz ultrasonic wave pulses are generated by thin piezoelectric transducers at 1-2 GHz. The wave pulses/packets travel through the silicon substrate and reflect off the silicon-sample interface. The reflected pulses are received back at the transducers for measurement. The 128x128 pixels, we measure the received pulses, acquiring both magnitude and phase.

  • How deep can we image with GHz US?

    The answer depends on what is being imaged. GHz ultrasonic pulses decay quite fast in liquids ,within 10-50um.  In solid crystals, loss is much lower, and ultrasonic pulses can travel mm to cm deep.

  • How does it measure thin film thickness?

    If a very thin film of liquid or other material is placed on the imager, the ultrasonic pulses reflected from the silicon-sample and the sample-air interface can inter, and generate Newton rings as the material evaporates.

  • Does the imager only work at one frequency?

    The Geegah imager can work at a frequency range from 1-2 GHz.

  • Is it real-time imaging?

    Geegah imager can achieve 4-10 frames per second, enabling real time movies of the surface. However, if less number of pixels are scanned, using a ROI (Region of Interest) process, higher frame rates are possible. Can it measure temperature? What is the operating temperature range of the imager. If an object that is hot or cold is placed on the imager surface, heat diffuses into the imager silicon substrate. This can change the temperature of the substrate, which changes the phase of the return pulses. This information is readout. We can operate the device from -10 to +120C

  • What does the ultrasonic impedance of an object tell me?

    Ultrasonic impedance of an object is a measure of the sample’s elasticity and density. The ultrasonic impedance is the square root of the elastic modulus times the density.

  • What hardware do I need to connect to my Geegah Ultrasound Chip Imager?

    The imager can be connected to laptop, or a desktop though a USB cable. Geegah’s GUI (Graphical User Interface) enables easy image collection, storage, image and movie making.

  • Is it possible to do image classification on Geegah images?

    Geegah also offers specialized image classification software for specific use cases.

  • Can I get a demo?

    Geegah can provide demos if you send us a sample.

  • I still need optimal recordings. Can the Geegah system work in parallel with optical imaging systems?

    Geegah imager works by imaging placing a sample on top. An optical microscope can be placed on looking at the top side of the sample. Hence, optical and ultrasonic images can be recorded simultaneously.