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
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[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 ...
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