The phrase "a certain time interval" is correct and usable in written English.
It can be used when referring to a specific but unspecified duration of time in various contexts, such as scientific, mathematical, or general discussions.
Example: "The experiment was conducted over a certain time interval to observe the changes in temperature."
Alternatives: "a specific duration" or "a defined time period."
We have found that a repetitive pulsatile drug release with a certain time interval is observed from a monolithic hydrogel device by surface erosion of the hydrogel.
First, the vibration acceleration data was segmented according to a certain time interval and then Product Functions (PFs) of each piece of the data were obtained by LMD.
A still very challenging method is based on the very definition of current itself: measuring the quantized flow of charges in a certain time interval in a nanodevice in a controlled way.
After a certain time interval, sharing information is possible between fishermen in a dynamic Moore's neighbourhood of cells at a broader scale and movement to adjacent areas may occur according to a set of rules.
In order to minimize the output ripples of the converters, the control signal of each converter is time shifted from each other by a certain time interval depending on the number of converters used in the topology.
A metre used to be defined as the distance between two scratch marks on a metal bar kept in Paris, but it is now much more precisely defined as the distance that light travels in a certain time interval (1/299,792,458 of a second).
A group constraint should be used if the absolute value of the group constraint forces all the observations to be done within a certain time interval, but does not specify the exact window (e.g. all done within 30 consecutive days, but the 30 day period can start at any time during the cycle).
All one can say is that there is a certain probability that an atom of a radioactive substance will decay during a certain time interval, or, equivalently, that half of the atoms of the sample will have decayed after a certain time i.e., the half-life of the material.
Wireless_Access_Request_Group i represents the wireless access request of the group i in a certain time interval.
During the process, 3 mL of suspension was withdrawn every a certain time interval and centrifuged to precipitate the photocatalyst.
To obtain its probability, we need to know the frequency of occurrence of the contingency in a certain time interval.
