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VHG was founded in 1981 as an independent analytical testing laboratory. In 1984, VHG expanded its operation to include the commercial manufacture of high-purity single and multi-element calibration standards for spectroscopic instrumentation.

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VHG has manufactured single and multi-element standards (both aqueous and oil-based) for more than 30 years, including petroleum standards, analytical reference standards for new and in-service oil applications, and standards for ASTM, DIN, IP, ISO, JIS and ANFOR methods, including EPA Tier 3.

VHG has manufactured single and multi-element standards (both aqueous and oil-based) for more than 30 years, including petroleum standards, analytical reference standards for new and in-service oil applications, and standards for ASTM, DIN, IP, ISO, JIS and ANFOR methods, including EPA Tier 3.

2023年7月20日 · VV极化：垂直发射，垂直接收。与HH极化类似，VV极化也适用于对地物的简单检测，特别是在极化敏感性较低的情况下。 双极化（Dual Polarization）： HV极化：水平发射，垂直接收。

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体布拉格光栅(VBG，VHG)，可被置于激光共振腔内用以对激光器波长锁定（中心波长精度为0.1-0.5nm ） 、横模纵模选取及控制、激光线宽压窄（低至20pm ）及提升激光器工作温度范围。

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