FOURIER TRANSFORM TYPE SPECTROPHOTOMETER

• US 20180073927A1
• Filed: 03/13/2015
• Published: 03/15/2018
• Est. Priority Date: 03/13/2015
• Status: Active Grant

• Current Assignee: Shimadzu Corporation
• Original Assignee: Shimadzu Corporation
• Inventors: KAMIKAKE, Tadafumi
• Granted Patent: US 10,502,626 B2
• Time in Patent Office: Days
• CPC Class Codes: G01J 2003/064 Use of other elements for scan, e.g. mirror, fixed grating
• CPC Class Codes: G01J 3/0202 Mechanical elements; Supports for optical elements
• CPC Class Codes: G01J 3/027 Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation
• CPC Class Codes: G01J 3/0275 making use of sensor-related data, e.g. for identification of sensor parts or optical elements
• CPC Class Codes: G01J 3/0289 Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking
• CPC Class Codes: G01J 3/06 Scanning arrangements arrangements for order-selection
• CPC Class Codes: G01J 3/4535 Devices with moving mirror G01J3/4532 takes precedence
• CPC Class Codes: G01N 21/27 using photo-electric detection G01N21/31 takes precedence; circuits for computing concentration logarithmic circuits G06G7/24; photometric circuits in general G01J

Abstract

A Fourier transform type spectrophotometer capable of stably controlling a speed of a moving mirror comprises a movable unit to which a moving mirror is fixed, outside-force-applying means configured to apply external force larger than movement resistance of the movable unit to the movable unit, a driving source configured to apply positive or negative driving force along the moving direction of the movable unit to the movable unit, a speed measurement unit configured to measure the speed of the movable unit, and a driving force control unit configured to control the driving force of the driving source so that the movable unit is moved in a predetermined manner based on the, wherein a rate of fluctuation of the driving force is suppressed by operating in a state in which the driving force of the driving source is high due to the external force to thereby stabilize the control.

Claims

1. A Fourier transform type spectrophotometer comprising:

a) a movable unit to which a moving mirror is fixed;

b) outside-force-applying means for always applying external force larger than movement resistance of the movable unit to the movable unit;

c) a driving source configured to apply positive or negative driving force along a moving direction of the movable unit to the movable unit;

d) a speed measurement unit configured to measure a moving speed of the movable unit; and

e) a driving force control unit configured to control the driving force of the driving source so that the movable unit is moved in a predetermined manner based on a moving speed.

2. The Fourier transform type spectrophotometer as recited in claim 1,

wherein gravity is used as the outside-force-applying means.

3. The Fourier transform type spectrophotometer as recited in claim 1,

wherein the outside-force-applying means is an elastic member urging the movable unit.

4. A Fourier transform type spectrophotometer, comprising:

a) a movable unit to which a moving mirror is fixed, the movable unit being movable on a guide;

b) inclination means configured to incline the guide such that component force of gravity of the movable unit in a direction along the guide is greater than movement resistance on the guide of the movable unit;

c) a driving source configured to apply positive or negative driving force along a moving direction of the movable unit on the guide to the movable unit;

d) a speed measurement unit configured to measure a moving speed of the movable unit; and

e) a driving force control unit configured to control the driving force of the driving source so that the movable unit is moved on the guide in a predetermined manner based on the moving speed.