Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change

A temperature change, near-zero expansion technology, applied in dynamic spectrometers, trajectory-stabilized spectrometers, mass spectrometers, etc., to achieve the effect of improving dimensional stability and performance

Pending Publication Date: 2021-04-20
天津国科医疗科技发展有限公司
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AI-Extracted Technical Summary

Problems solved by technology

The difficulty lies in the high-precision and high-stability quadru...
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Abstract

The invention provides an inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change, and particularly provides a quadrupole rod mass analyzer size stability matching design scheme for a mass spectrometer, which can remarkably improve the size temperature stability of an inscribed circle of a quadrupole rod assembly as a key index under the condition of adopting a pole rod made of the same material. And the linear expansion coefficient of the inscribed circle is close to or equal to zero, so that the performance of the quadrupole rod assembly during quality analysis is improved. Compared with the prior art, the invention has the following advantages: a quadrupole rod product with excellent dimensional stability under temperature change can be obtained. The dimensional stability of the quadrupole rod assembly adopting the patent technology is obviously superior to that of a common design, and the dimensional stability of the quadrupole rod under the condition of temperature change can be greatly improved, so that the performance of the quadrupole rod assembly serving as a mass analyzer in a mass spectrometer is improved.

Application Domain

Technology Topic

Mass analysisLinear expansion coefficient +5

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  • Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change
  • Inscribed circle near-zero expansion quadrupole rod capable of adapting to temperature change

Examples

  • Experimental program(1)

Example Embodiment

[0037]Embodiment:
[0038]For example, the geometry D = 12, r = 22, then R = D / (1.13 * 2) ≈ 5.31 is calculated. Then L = R-R-D = 4.69.
[0039]If the positioning cartridge 1 and the pole 3 employ alumina ceramics (the linear expansion coefficient is about 8E-6/ ° C), using the formula 4, the connection line expansion coefficient can be selected by A2 = (A1 * R-A3 * D) /L=17.05E-6/ ° C.
[0040]At this time, the connection 2 can select the wire expansion coefficient of copper, brass and other materials of about 17.05. For example, brass is in the range of 0-100 ° C, the linear expansion coefficient is about 17.11e-6/ ° C.
[0041]Using Formula 5, | A4 | = | (A1 * T * R-A2 * T * L-A3 * T * D) / (t * r) | = | (A1 * R-A2 * L-A3 * D) /R|=| 0.05E-6/ ° C | ≤ | 3e-6/ ° C |. Meet the requirements.
[0042] According to the above geometry and the connector, the quadrupole product changes from normal temperature 20 ° C to 50 ° C (temperature rise 30 ° C), the internal cut circle radius change amount is a4 * 30 ° C * 5.31 mm = -0.008 μm (ie --- 8nm). And if the connecting member 2 uses a common ceramic seal, the linear expansion coefficient is about 4.8E -6 / ° C, the amount of the inner cutting radius variation can be of 1.72 μm.
[0043] It should be noted that the design scheme obtained by adjusting the structural dimensions by similar techniques, such as fixed materials, such as fixed materials, so that | A4 | ≤ | 3e-6 / ° C |, all within the technical scope of this patent.
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