Design of a new digital ultrasonic flaw detector based on Linux operating system

There are many kinds of ultrasonic flaw detectors, but in the actual flaw detection process, pulse reflection ultrasonic flaw detector is most widely used. Generally, in homogeneous materials, the existence of defects will cause discontinuity of materials, which often leads to inconsistency of acoustic impedance. From the reflection theorem, we know that ultrasonic will be […]

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Circuit diagram of signal detection and processing

The following figure shows the signal detection and processing circuit composed of red pyroelectric infrared sensor, photoresist and BISS0001. The red pyroelectric infrared sensor is only suitable for the wavelength of 10 μ M (infrared wavelength radiated by human body) is sensitive to infrared radiation, so objects other than human body will not cause probe […]

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Example explanation of FPGA area change speed

In FPGA, how to convert a signal with sampling rate of 480mhz and if frequency of 302.5mhz to baseband signal with zero if? Firstly, a signal with an IF frequency of 302.5mhz can only be sampled by band-pass sampling at a sampling frequency of 480mhz. The actual frequency of the sampled signal is 177.5mhz. Then […]

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Manufacturer’s Guide on how to select a / D converter

Have you ever studied the A / D converter data sheet in depth? This is an adventure, even for people with analog engineering backgrounds, and it can be daunting for many manufacturers from digital and software backgrounds. The parameter table is helpful, but for manufacturers, understanding the work at hand is more important than filtering […]

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Introduction to the working principle of MEMS accelerometer

Accelerometer principle 1.1 the accelerometer is composed of MEMS sensor and signal processing chip. 1.2 working principle of MEMS accelerometer It is composed of upper capacitor, middle capacitor plate (movable), lower capacitor plate, etc; When the acceleration reaches a certain value, the middle capacitor plate will move and the distance from the upper and lower […]

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Installation method of eddy current sensor

It is understood that the eddy current sensor can measure the distance between the measured metal conductor and the probe surface statically and dynamically with non-contact, high linearity and high resolution. It is a non-contact linear measurement tool. The eddy current sensor can accurately measure the static and dynamic relative displacement changes between the measured […]

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Signal processing circuit design of automobile sensor

The hardware structure of wheel speed sensor is based on 80C31 single chip microcomputer. The peripheral circuits include signal processing circuit, bus control circuit and bus interface circuit. After filtering, shaping and photoelectric isolation, the signal generated by the wheel speed sensor is sent to the / INT0 input pin of 80C31. T1 is used […]

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