AD acquisition card (A/D acquisition card, Analog-to-Digital acquisition card) is a hardware device that converts analog signals into digital signals and transmits them to computers or other processing devices for analysis or processing. It is widely used in industrial automation, scientific research, medicine, audio processing, and other fields.

Here are the key points of the AD acquisition card:

Function:

1. Signal acquisition: collect analog signals such as voltage, current, temperature, pressure, etc.

2. Analog-to-digital conversion (ADC): converts continuous analog signals into discrete digital signals.

3. Data transmission: Transmit digital signals to the host through interfaces (such as USB, PCI, PCIe, Ethernet, etc.).

Main parameters:

1. Sampling rate: The speed at which analog signals are collected, usually measured in samples per second (SPS).

2. Resolution: The resolution of the analog-to-digital converter is usually expressed in bits. The higher the resolution, the higher the sampling accuracy (eg: 12 bits, 16 bits, 24 bits, etc.).

3. Number of channels: how many signals can be collected simultaneously.

4. Input range: supported signal voltage or current range.

5. Interface type: USB, PCIe, LAN, etc.

6. Signal-to-noise ratio (SNR) and total harmonic distortion (THD): used to measure the quality of the acquired signal.

The data acquisition card is a crucial component in the scanning acoustic microscope system. Its performance directly determines the imaging quality, resolution, and analysis accuracy of the microscope. Choosing a high-performance data acquisition card can not only optimize the core functions of the microscope, but also expand its application potential in different fields.

Important components of scanning acoustic microscope:

1. probe

2. data acquisition card

3. pulse generator