| 摘要 |
AN ACOUSTIC SENSING MEANS SUCH AS A MICROPHONE (30) OR A THIN-FILM SENSOR IS LOCATED IN A FLOWING MEDIUM. TO PREVENT THE SENSING OF FLOW GENERATED NOISE, THE SENSING MEANS (30) IS SEPARATED FROM THE FLOWING MEDIUM BY AT LEAST THREE STAGES OF SHIELDING. IN A PREFERRED EMBODIMENT, THE SENSING MEANS (30) IS LOCATED WITHIN A FOAM SHIELD (112) WHICH IS LOCATED IN A FRAME COVERED BY A FABRIC SHIELD (102) AND WHICH IS, IN TURN, LOCATED IN A SECOND FRAME (105) COVERED BY A SECOND FABRIC SHIELD (103). A SPANDEX FABRIC IS SUITABLE FOR USE IN THE PRESENT INVENTION.FIG. 5
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