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A particle momentum detector has a massive support with a flat surface on which is mounted a piezoelectric member supporting a flat low mass plate resistant to deformation by impinging particles. The low mass plate has a rigidity suppressing multiple mode vibration of the plate. The piezoelectric me

A particle momentum detector has a massive support with a flat surface on which is mounted a piezoelectric member supporting a flat low mass plate resistant to deformation by impinging particles. The low mass plate has a rigidity suppressing multiple mode vibration of the plate. The piezoelectric member generates a damped oscillating electrical signal when a particle impinges upon the plate. A circuit integrates a portion, such as the first half cycle, of the damped oscillating electrical signal to determine momentum of the particle.

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A particle momentum detector has a massive support with a flat surface on which is mounted a piezoelectric member supporting a flat low mass plate resistant to deformation by impinging particles. The low mass plate has a rigidity suppressing multiple mode vibration of the plate. The piezoelectric me

A particle momentum detector has a massive support with a flat surface on which is mounted a piezoelectric member supporting a flat low mass plate resistant to deformation by impinging particles. The low mass plate has a rigidity suppressing multiple mode vibration of the plate. The piezoelectric member generates a damped oscillating electrical signal when a particle impinges upon the plate. A circuit integrates a portion, such as the first half cycle, of the damped oscillating electrical signal to determine momentum of the particle. ly with said lead material, a sensor unit including a semiconductor sensor for converting pressure to an electric signal, a signal processing circuit, an output terminal for outputting a processed signal, and a chip case having an opening, and an electronic part for reducing electric disturbance, wherein a part of said lead material is exposed into said opening of said external case, wherein said sensor unit and said electronic part are arranged in said opening of said external case, wherein said lead material, said electronic part, and said terminal of said sensor unit are electrically connected in said opening of said external case, and wherein said electronic part is joined to said lead material through a conductive joined member. 2. A pressure detector, comprising: a lead material partially having a connector terminal for electrical connection with an outside, an external case partially having an opening which is formed integratedly with said lead material, a sensor unit including a semiconductor sensor for converting pressure to an electric signal, a signal processing circuit, an output terminal for outputting a processed signal, and a chip case having an opening, and an electronic part for reducing electric disturbance, wherein a part of said lead material is exposed into said opening of said external case, wherein said sensor unit and said electronic part are arranged in said opening of said external case, wherein said lead material, said electronic part, and said terminal of said sensor unit are electrically connected in said opening of said external case, and wherein a pressure introduction pipe is formed integrally with the external case and, at a side opposed to a side to which said pressure introduction pipe is provided, resin is injected into the opening of the external case. 3. A pressure detector, comprising: a lead material partially having a connector terminal for electrical connection with an outside, an external case partially having an opening which is formed integratedly with said lead material, a sensor unit including a semiconductor sensor for converting pressure to an electric signal, a signal processing circuit, an output terminal for outputting a processed signal, and a chip case having an opening, and an electronic part for reducing electric disturbance, wherein a part of said lead material is exposed into said opening of said external case, wherein said sensor unit and said electronic part are arranged in said opening of said external case, wherein said lead material, said electronic part, and said terminal of said sensor unit are electrically connected in said opening of said external case, and wherein a sensor chip, a terminal of said sensor chip, and said lead material are installed in a direction of a connector so as to be received within a width of said connector. 4. A pressure detector comprising: a lead material partially having a connector terminal for electrical connection with an outside, an external case partially having an opening and a pressure introduction hole interconnecting with said opening which is formed integratedly with said lead material, and a sensor unit including a semiconductor sensor for converting pressure to an electric signal, a signal processing circuit, an output terminal for outputting a processed signal, and a chip case having an opening, wherein a part of said lead material is exposed into said opening of said external case, wherein said opening of said sensor unit is arranged in said opening of said external case so as to interconnect with said pressure introduction hole, wherein said lead material and said output terminal of said sensor unit are electrically connected in said opening of said external case, wherein said sensor unit and said exposed part of said lead material are covered at least partially with resin injected into said opening of said external case and said sensor unit and said external case are integratedl