Patent ID: 6170345
Filing Date: 2001-01-09
Classification: G01P,G05D

Abstract:
An apparatus for positioning a measuring probe (3) having a probe axis (A), relative to a measuring location and relative to a fluid flow direction (F) in a fluid flow testing enclosure (1) having an enclosure axis (L), said apparatus comprising:(a) a positioning device (2) having a positioning axis extending coaxially in axial alignment with said probe axis (A), said positioning device (2) comprising a first servomotor (M1) for positioning said measuring probe (3) by rotating said measuring probe (3) around said probe axis (A), and a second servomotor (M2) for displacing said measuring probe (3) in a direction (T) of said probe axis (A),(b) a control system including an electronic computer (27) and a control device (21) communicating with said electronic computer (27) and with the servomotor for controlling said positioning of said measuring probe (3),(c) an adjusting device (4) rigidly coupled to said measuring probe (3) for rotation with said measuring probe (3), said adjusting device (4) comprising a pendulum (6) rotatably supported on a pendulum journal axis (8) for defining a zero position (N) for said measuring probe (3) when said pendulum (6) is in a rest position,(d) pendulum limits (G1, G2) defined in said adjusting device (4) in such positions that said zero position (N) is located centrally between said pendulum limits (G1, G2),(e) means (9, 9') for generating signals in response to pendulum excursions reaching said pendulum limits (G1, G2) and for providing respective limit position signals to said electronic computer (27), and wherein(f) said electronic computer (27) generates control signals in response to said limit position signals by mathematically dividing a pendulum angular excursion range defined by said limit position signals between said pendulum limits (G1, G2), into two halves for controlling said servomotors with said control signals until a line (M) through a center of gravity (P) of said pendulum (6) coincides with said zero position (N), whereby said measuring probe (3) is in a defined position relative to said enclosure axis (L).